Bibliographies thématiques / Quantum Mechanical Coupling

Littérature scientifique sur le sujet « Quantum Mechanical Coupling »

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Publié le 7 septembre 2023

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Articles de revues sur le sujet "Quantum Mechanical Coupling"

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Manukhova, Alisa D., Andrey A. Rakhubovsky et Radim Filip. « Atom-Mechanical Hong-Ou-Mandel Interference ». Quantum 6 (13 avril 2022) : 686. http://dx.doi.org/10.22331/q-2022-04-13-686.

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Quantum coupling between mechanical oscillators and atomic gases generating entanglement has been recently experimentally demonstrated using their subsequent interaction with light. The next step is to build a hybrid atom-mechanical quantum gate showing bosonic interference effects of single quanta in the atoms and oscillators. We propose an experimental test of Hong-Ou-Mandel interference between single phononic excitation and single collective excitation of atoms using the optical connection between them. A single optical pulse is sufficient to build a hybrid quantum-nondemolition gate to observe the bunching of such different quanta. The output atomic-mechanical state exhibits a probability of a hybrid bunching effect that proves its nonclassical aspects. This proposal opens a feasible road to broadly test such advanced quantum bunching phenomena in a hybrid system with different specific couplings.
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Barrios, Gabriel, Francisco Peña, Francisco Albarrán-Arriagada, Patricio Vargas et Juan Retamal. « Quantum Mechanical Engine for the Quantum Rabi Model ». Entropy 20, no 10 (7 octobre 2018) : 767. http://dx.doi.org/10.3390/e20100767.

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We consider a purely mechanical quantum cycle comprised of adiabatic and isoenergetic processes. In the latter, the system interacts with an energy bath keeping constant the expectation value of the Hamiltonian. In this work, we study the performance of the quantum cycle for a system described by the quantum Rabi model for the case of controlling the coupling strength parameter, the resonator frequency, and the two-level system frequency. For the cases of controlling either the coupling strength parameter or the resonator frequency, we find that it is possible to closely approach to maximal unit efficiency when the parameter is sufficiently increased in the first adiabatic stage. In addition, for the first two cases the maximal work extracted is obtained at parameter values corresponding to high efficiency, which constitutes an improvement over current proposals of this cycle.
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Zloshchastiev, Konstantin G. « On the Dynamical Nature of Nonlinear Coupling of Logarithmic Quantum Wave Equation, Everett-Hirschman Entropy and Temperature ». Zeitschrift für Naturforschung A 73, no 7 (26 juillet 2018) : 619–28. http://dx.doi.org/10.1515/zna-2018-0096.

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AbstractWe study the dynamical behavior of the nonlinear coupling of a logarithmic quantum wave equation. Using the statistical mechanical arguments for a large class of many-body systems, this coupling is shown to be related to temperature, which is a thermodynamic conjugate to the Everett-Hirschman’s quantum information entropy. A combined quantum-mechanical and field-theoretical model is proposed, which leads to a logarithmic equation with variable nonlinear coupling. We study its properties and present arguments regarding its nature and interpretation, including the connection to Landauer’s principle. We also demonstrate that our model is able to describe linear quantum-mechanical systems with shape-changing external potentials.
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Heinekey, D. Michael, Amber S. Hinkle et John D. Close. « Quantum Mechanical Exchange Coupling in Iridium Trihydride Complexes ». Journal of the American Chemical Society 118, no 23 (janvier 1996) : 5353–61. http://dx.doi.org/10.1021/ja952142c.

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Wang, Jing-Jing, Ming-Song Ding, Li Xiong et Li Zheng. « Enhancement of feasibility of macroscopic quantum superposition state with the quantum Rabi-Stark model ». Communications in Theoretical Physics 74, no 3 (1 mars 2022) : 035105. http://dx.doi.org/10.1088/1572-9494/ac531b.

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Abstract We propose an efficient scheme to generate a macroscopical quantum superposition state with a cavity optomechanical system, which is composed of a quantum Rabi-Stark model coupling to a mechanical oscillator. In a low-energy subspace of the Rabi-Stark model, the dressed states and then the effective Hamiltonian of the system are given. Due to the coupling of the mechanical oscillator and the atom-cavity system, if the initial state of the atom-cavity system is one of the dressed states, the mechanical oscillator will evolve into a corresponding coherent state. Thus, if the initial state of the atom-cavity system is a superposition of two dressed states, a coherent state superposition of the mechanical oscillator can be generated. The quantum coherence and their distinguishable properties of the two coherent states are exhibited by Wigner distribution. We show that the Stark term can enhance significantly the feasibility and quantum coherence of the generated macroscopic quantum superposition state of the oscillator.
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Karg, Thomas M., Baptiste Gouraud, Chun Tat Ngai, Gian-Luca Schmid, Klemens Hammerer et Philipp Treutlein. « Light-mediated strong coupling between a mechanical oscillator and atomic spins 1 meter apart ». Science 369, no 6500 (7 mai 2020) : 174–79. http://dx.doi.org/10.1126/science.abb0328.

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Engineering strong interactions between quantum systems is essential for many phenomena of quantum physics and technology. Typically, strong coupling relies on short-range forces or on placing the systems in high-quality electromagnetic resonators, which restricts the range of the coupling to small distances. We used a free-space laser beam to strongly couple a collective atomic spin and a micromechanical membrane over a distance of 1 meter in a room-temperature environment. The coupling is highly tunable and allows the observation of normal-mode splitting, coherent energy exchange oscillations, two-mode thermal noise squeezing, and dissipative coupling. Our approach to engineering coherent long-distance interactions with light makes it possible to couple very different systems in a modular way, opening up a range of opportunities for quantum control and coherent feedback networks.
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Mavromatos, N. E., et D. V. Nanopoulos. « On Quantum Mechanical Aspects of Microtubules ». International Journal of Modern Physics B 12, no 05 (20 février 1998) : 517–42. http://dx.doi.org/10.1142/s0217979298000326.

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We discuss possible quantum mechanical aspects of MicroTubules (MT), based on recent developments in quantum physics. We focus on potential mechanisms for "energy-loss-free" transport along the microtubules, which could be considered as realizations of Fröhlich's ideas on the rôle of solitons for superconductivity and/or biological matter. In particular, by representing the MT arrangements as cavities, we present a novel scenario on the formation of macroscopic (or mesoscopic) quantum-coherent states, as a result of the (quantum-electromagnetic) interactions of the MT dimers with the surrounding molecules of the ordered water in the interior of the MT cylinders. Such states decohere due to dissipation through the walls of the MT. Transfer of energy without dissipation, due to such coherent modes, could occur only if the decoherence time is larger than the average time scale required for energy transfer across the cells. We present some generic order of magnitude estimates or the decoherence time in a typical model for MT dynamics. Our conclusion is that the quantum coherent states play a rôle in energy transfer if the dissipation through the walls of the MT cavities is fairly suppressed, corresponding to damping time scales Tr≥10-4-10-5 sec, for moderately large MT networks. We suggest specific experiments to test the above-conjectured quantum nature of the microtubular arrangements inside the cell. These experiments are similar in nature to those in atomic physics, used in the detection of the Rabi-Vacuum coupling between coherent cavity modes and atoms. Our conjecture is that a similar Rabi-Vacuum-splitting phenomenon occurs in the absorption (or emission) spectra of the MT dimers, which would constitute a manifestation of the dimer coupling with the coherent modes in the ordered-water environment (dipole quanta), which emerge due to "super-radiance".
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Sabo-Etienne, Sylviane, et Bruno Chaudret. « Quantum Mechanical Exchange Coupling in Polyhydride and Dihydrogen Complexes ». Chemical Reviews 98, no 6 (septembre 1998) : 2077–92. http://dx.doi.org/10.1021/cr9601066.

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Schmitt, H. A., et A. Mufti. « Noncompact orthosympletic supersymmetry : an example from N = 1, d = 1 supersymmetric quantum mechanics ». Canadian Journal of Physics 68, no 12 (1 décembre 1990) : 1454–55. http://dx.doi.org/10.1139/p90-208.

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The supersymmetric quantum mechanical harmonic oscillator, a particular example of an N = 1, d = 1 supersymmetric quantum mechanical model, is used to construct a Hamiltonian exhibiting a noncompact orthosymplectic supersymmetry. This Hamiltonian is the strong-coupling limit of the Jaynes–Cummings model.
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Aporvari, Ahmad Shafiei, et David Vitali. « Strong Coupling Optomechanics Mediated by a Qubit in the Dispersive Regime ». Entropy 23, no 8 (27 juillet 2021) : 966. http://dx.doi.org/10.3390/e23080966.

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Cavity optomechanics represents a flexible platform for the implementation of quantum technologies, useful in particular for the realization of quantum interfaces, quantum sensors and quantum information processing. However, the dispersive, radiation–pressure interaction between the mechanical and the electromagnetic modes is typically very weak, harnessing up to now the demonstration of interesting nonlinear dynamics and quantum control at the single photon level. It has already been shown both theoretically and experimentally that if the interaction is mediated by a Josephson circuit, one can have an effective dynamics corresponding to a huge enhancement of the single-photon optomechanical coupling. Here we analyze in detail this phenomenon in the general case when the cavity mode and the mechanical mode interact via an off-resonant qubit. Using a Schrieffer–Wolff approximation treatment, we determine the regime where this tripartite hybrid system behaves as an effective cavity optomechanical system in the strong coupling regime.
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Thèses sur le sujet "Quantum Mechanical Coupling"

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Vaish, Nitika. « Optomechanical transducer based on a single quantum dot ». Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAY074.

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Dans le contexte de la nanomécanique, les systèmes hybrides quantiques sont des oscillateurs mécaniques couplés à un seul objet quantique individuel. Ces systèmes offrent des possibilités radicalement nouvelles pour la fabrication de transducteurs optomécaniques extrêmement sensibles et ultra-compacts, qui peuvent servir de capteurs de position ou de nano-moteurs.L’objet étudié dans ce travail est un système hybride constitué d’une boite quantique semi-conducteur unique couplée aux vibrations d’un fil photonique. Il a été démontré dans l'équipe, il y a quelques années, que l'énergie de transition de la boite quantique dépend de la contrainte générée par les oscillations du fil.Dans cette thèse, nous démontrons l'effet inverse, où chaque photon émis par la boite quantique s'accompagne d'une force qui entraîne l’oscillations du fil photonique. Ceci permet de réaliser un nano moteur fonctionnant grâce à la contrainte générée par une seule boite quantique pilotée par laser. L'effet est appelé "effet marteau quantique". Ce résultat ouvre la possibilité de la réalisation future d’un état quantique du mouvement par le transfert de la « quanticité » d'un système à deux niveaux vers le mouvement d’un oscillateur mécanique macroscopique
In the context of nanomechanics, quantum hybrid systems are mechanical oscillators coupled to a single individual quantum system. These systems offer radically new possibilities for the fabrication of extremely sensitive and ultra-compact optomechanical transducers, which can serve as position sensors or nano engines.The hybrid system investigated in this work consists of a single semiconducting quantum dot (QD) embedded in a vibrating photonic wire. It has been shown in the team, a few years ago, that the transition energy of the QD depends on the strain generated by the wire oscillations.In this thesis, we demonstrate the reverse effect, where each photon emitted by the QD comes along with a strain-induced force which drives the oscillations of the photonic wire. This realizes a nano engine run by a laser-driven single quantum object. The effect has been coined “Quantum Hammer effect”. This result opens the possibility for the future realization of a quantum state of motion via the transfer of the ”quantumness” of a two-level system towards the motion of a macroscopic mechanical oscillator
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Rossich, Molina Estefanía. « Addressing the reactivity of biomolecules in the gas phase : coupling tandem mass spectrometry with chemical dynamics simulations ». Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLE043.

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Durant cette thèse, nous avons abordé l'étude de la réactivité en phase gazeuse des biomolécules. L’avènement des techniques d’ionisation douces telle que l’ionisation par éléctronébulisation, a rendu possible ces dernières années, la formation d'ions en phase gazeuse sans dégrader la biomolécule étudiée.La Dissociation Induite par Collision (CID) est un cas particulier de spectrométrie de masse en tandem, que nous avons utilisée durant ce travail. Le principe du CID est d'activer les modes rovibrationnelles d’un système moléculaire ionique par collision avec un gaz inerte, ce qui augmente la probabilité de fragmentation de l'ion. Bien qu'étant une technique très utile d'un point de vue analytique, la spectrométrie de masse en tandem ne donne pas d'informations sur les mécanismes des réactions se produisant dans la cellule de collision; afin d’obtenir ces informations, les simulations de dynamique chimiques apparaissent comme un outil satisfaisant. En effet, en utilisant la dynamique directe, nous évitons ainsi d'explorer la totalité de la surface d'énergie potentielle, qui devient compliquée lors de l’étude d’édifices moléculaires de grande taille. Etant donné que les simulations de dynamique chimiques sont limitées à de courtes échelles, de l’ordre de la dizaine de picosecondes, nous avons également employé la théorie unimoléculaire RRKM (Rice-Ramsperger-Kassel-Marcus) pour étudier la réactivité à des temps plus longs, en vue de comprendre les processus réactionnels se produisant à l’issue du processus de relaxation vibrationnelle intramoléculaire (IVR). Durant ce travail de thèse, nous avons choisi d'étudier comme système modèle de base nucléique la molécule d'uracile. Par ailleurs,nous avons aussi étudié la réactivité en phase gazeuse de sucres (cellobiose, maltose et gentiobiose), qui ont été au préalable dérivatisés afin de localiser la charge sur la molécule et ainsi simplifier l’étude théorique associée
In the present thesis, we address the study of the reactivity of biomolecules in the gasphase.The advent of soft ionization techniques such as electrospray ionization, made possible, in the last years, the gentle formation of ions in the gas phase without breaking the molecule understudy.Collision Induced Dissociation (CID) is aparticular case of tandem mass spectrometrydynamics simulations are pointed like asatisfactory tool. Using direct dynamics weavoid exploring the whole potential energysurface, which becomes really complicatedwhen dealing with big molecules.Since chemical dynamics simulations arerestricted to the short time scale reactivity,typically ~10ps, we make use of the Rice–Ramsperger–Kassel–Marcus (RRKM)unimolecular theory to study the reactivity atUniversité Paris-SaclayEspace Technologique / Immeuble DiscoveryRoute de l’Orme aux Merisiers RD 128 / 91190 Saint-Aubin, Francethat we use in the present thesis. The aim of CIDis to activate the rovibrational modes of an ionicmolecular system by collisions with an inert gas,increasing the probability of the ion of beingfragmented.Despite being a really useful technique, tandemmass spectrometry does not give informationabout the mechanisms of the reactions takingplace in the collision cell; in order to obtain suchinformation, chemicallonger time scales to understand reaction pathsthat take place after intramolecular vibrationrelaxation (IVR).In the present thesis we have chosen to study asmodel system of nucleobase the uracil molecule.Furthermore, we also studied the gas-phase reactivity of carbohydrates (cellobiose, maltose and gentiobiose), which were preliminarily derivatized in order to simplify the charge localization, and consequently the theoretical study
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Graves, Max. « Path Integral Quantum Monte Carlo Study of Coupling and Proximity Effects in Superfluid Helium-4 ». ScholarWorks @ UVM, 2014. http://scholarworks.uvm.edu/graddis/299.

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When bulk helium-4 is cooled below T = 2.18 K, it undergoes a phase transition to a superfluid, characterized by a complex wave function with a macroscopic phase and exhibits inviscid, quantized flow. The macroscopic phase coherence can be probed in a container filled with helium-4, by reducing one or more of its dimensions until they are smaller than the coherence length, the spatial distance over which order propagates. As this dimensional reduction occurs, enhanced thermal and quantum fluctuations push the transition to the superfluid state to lower temperatures. However, this trend can be countered via the proximity effect, where a bulk 3-dimensional (3d) superfluid is coupled to a low (2d) dimensional superfluid via a weak link producing superfluid correlations in the film at temperatures above the Kosterlitz-Thouless temperature. Recent experiments probing the coupling between 3d and 2d superfluid helium-4 have uncovered an anomalously large proximity effect, leading to an enhanced superfluid density that cannot be explained using the correlation length alone. In this work, we have determined the origin of this enhanced proximity effect via large scale quantum Monte Carlo simulations of helium-4 in a topologically non-trivial geometry that incorporates the important aspects of the experiments. We find that due to the bosonic symmetry of helium-4, identical particle permutations lead to correlations between contiguous spatial regions at a length scale greater than the coherence length. We show that quantum exchange plays a large role in explaining the anomalous experimental results while simultaneously showing how classical arguments fall short of this task.
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Hadjar, Yassine. « Etude du couplage optomécanique dans une cavité de grande finesse ; observation du mouvement Brownien d'un miroir ». Phd thesis, Université Pierre et Marie Curie - Paris VI, 1998. http://tel.archives-ouvertes.fr/tel-00004675.

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Nous étudions théoriquement et expérimentalement le couplage optomécanique induit par la pression de radiation entre un faisceau lumineux et un objet macroscopique tel qu'un miroir. Nous présentons une étude théorique des effets quantiques induits par la pression de radiation dans une cavité optique dont un miroir est mobile. Le miroir peut se déplacer sous l'effet de la pression de radiation et ce mouvement change la phase du champ réfléchi par la cavité. Ce couplage optomécanique induit un déphasage du champ équivalent à un effet Kerr optique. Un tel dispositif peut être utilisé pour produire des états comprimés ou réaliser une mesure quantique non destructive.
Nous présentons les résultats obtenus dans notre expérience où un faisceau laser est envoyé dans une cavité à une seule entrée-sortie, dont le miroir mobile est déposé sur un résonateur mécanique. Nous avons observé le mouvement Brownien du miroir. Nous avons aussi utilisé un second faisceau modulé en intensité afin d'exciter les modes acoustiques du résonateur. Ceci permet de caractériser la réponse mécanique du résonateur et le couplage entre la lumière et les modes acoustiques. Nous avons enfin démontré l'efficacité de notre dispositif pour la mesure de petits déplacements du miroir. Le plus petit déplacement observable est égale à 2x10^(-19) m/Hz(1/2), en bon accord avec la prédiction théorique.
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Fayon, Pierre. « Développement d’un schéma de couplage QM/MM (Quantum Mechanic / Molecular Mechanic) pour les états excités localisés dans les matériaux hybrides organique-inorganiques ». Thesis, Pau, 2011. http://www.theses.fr/2011PAUU3018/document.

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Ces dernières années, la mise au point de matériaux hybrides organique-inorganiques a fait l’objet d’un intérêt grandissant dans le domaine de la chimie verte. Les matériaux hybrides a base de silice fonctionnalisée par des molécules organiques possèdent des propriétés modulables, permettant leur application dans plusieurs domaines (photochimie, médecine, dépollution . . .). D’un point de vue théorique, le challenge d’une telle étude résulte dans la détermination des propriétés d’optiques. En effet, la taille de ces systèmes ne permet pas un traitement de ces derniers d’un point de vue strictement quantique. L’enjeu de ce travail de recherche est le développement d’un programme qm/mm/tddft (Quantum Mechanic/Molecular Mechanic/ Time Dependant Density Functional Theory), pour le calcul des états électroniques excités localisés dans les solides, avec une applicationparticulière au domaine UV-visible dans les matériaux hybrides organique-inorganiques.Dans la pratique, l’intégration des équations classiques du mouvement de tous les noyaux est effectuée par le programme de dynamique moléculaire dl poly, tandis que les contributions aux forces issues des atomes dans la partie de la simulation quantique sont évaluées par le code siesta en utilisant la méthode dft (Density Functional Theory). Les spectres électroniques seront calculés avec un nouveau code de tddft (Time Dependant Density Fuctional Theory) développé pour ce projet, dans lequel l’utilisation d’une base de produits dominants accélère le calcul de façon notable
Last years, the development of organic-inorganic hybrid materials has been a growing interest in the field of green chemistry. Hybrid materials based on silica functionalized with organic molecules have flexible properties, allowing their application in several fields (photochemistry, medicine, ...). From a theoretical point of view, the challenge of such a study results in determination of the optical properties. Indeed, the size of the system does not allow treatment with a purely quantum theory. The aim of this research is to develop a qm/mm/tddft (Quantum Mechanic / Molecular Mechanic / Time Dependent Density Functional Theory) code to calculate the excited electronic states localized in solids, with a particular application for the UV-visible region in organic-inorganic hybrid materials. In practice, the integration of classical equations of motion of all the nuclei are made by the molecular dynamics program dl poly, while contributions from the forces in the quantum simulation are evaluated by using the code siesta with the dft (Density Functional Theory) method . The electronic spectra are calculated with a new tddft code developed for this project, in which the use of dominants products accelerates the calculation significantly
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Dednam, Wynand. « Atomistic simulations of competing influences on electron transport across metal nanocontacts ». Thesis, Universidad de Alicante, 2019. http://hdl.handle.net/10500/26155.

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In our pursuit of ever smaller transistors, with greater computational throughput, many questions arise about how material properties change with size, and how these properties may be modelled more accurately. Metallic nanocontacts, especially those for which magnetic properties are important, are of great interest due to their potential spintronic applications. Yet, serious challenges remain from the standpoint of theoretical and computational modelling, particularly with respect to the coupling of the spin and lattice degrees of freedom in ferromagnetic nanocontacts in emerging spintronic technologies. In this thesis, an extended method is developed, and applied for the first time, to model the interplay between magnetism and atomic structure in transition metal nanocontacts. The dynamic evolution of the model contacts emulates the experimental approaches used in scanning tunnelling microscopy and mechanically controllable break junctions, and is realised in this work by classical molecular dynamics and, for the first time, spin-lattice dynamics. The electronic structure of the model contacts is calculated via plane-wave and local-atomic orbital density functional theory, at the scalar- and vector-relativistic level of sophistication. The effects of scalar-relativistic and/or spin-orbit coupling on a number of emergent properties exhibited by transition metal nanocontacts, in experimental measurements of conductance, are elucidated by non-equilibrium Green’s Function quantum transport calculations. The impact of relativistic effects during contact formation in non-magnetic gold is quantified, and it is found that scalar-relativistic effects enhance the force of attraction between gold atoms much more than between between atoms which do not have significant relativistic effects, such as silver atoms. The role of non-collinear magnetism in the electronic transport of iron and nickel nanocontacts is clarified, and it is found that the most-likely conductance values reported for these metals, at first- and lastcontact, are determined by geometrical factors, such as the degree of covalent bonding in iron, and the preference of a certain crystallographic orientation in nickel.
Physics
Ph. D. (Physics)
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Xavier, Francis George Densingh. « NONADIABATIC COLLISIONS OF PROTON WITH CO AND O2 MOLECULES : A QUANTUM MECHANICAL STUDY ». Doctoral thesis, 2010. http://hdl.handle.net/10316/95854.

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Documentos apresentados no âmbito do reconhecimento de graus e diplomas estrangeiros
Nonadiabatic phenomena are ubiquitous in nature. The dynamics of proton-molecule collisions often evolve on highly coupled electronic potential energy surfaces leading to inelastic and charge transfer processes. In this thesis, we have investigated the quantum dynamics of energy transfer processes involving the inelastic vibrational excitations and the vibrational charge transfer collisions in the H+ + CO and the H+ + O2 systems on our newly obtained quasi-diabatic ab initio potential energy surfaces for collision energies 0-30 eV and compared the collision attributes with the earlier theoretical results as well as the available stateto- state experimental data obtained from the molecular beam study and H+/H energy-loss spectra. We have described the computational details of the ab initio potential energy surfaces at the configuration interaction level of accuracy employing the correlation consistent polarized valence triple zeta basis sets. We report the details of time-independent quantum dynamics calculations for the inelastic vibrational excitations and vibrational charge transfer processes under the framwork of vibrational close-coupling rotational infinite order sudden approximation. To the best of our knowledge the present ab initio global adiabatic and quasi-diabatic potential energy surfaces for the ground and the first excited electronic states for the H+ + CO system are being presented perhaps for the first time in the literature. The present theoretical results are found to be in good agreement with those of experiments for the inelastic vibrational excitations and they are in overall qualitative agreement for charge transfer channel in the experimental trend. It is suggested that quantitative agreement between theory and experiment can be achieved by modelling the dynamics as a three- and four-state process. For the H+ + O2 system. quantum dynamics with the two-state (the ground and the first excited electronic states) coupling yields results in general agreement with the experiments. Significant improvement is achieved when the dynamics is carried out with four-state (the ground and the lowest three excited electronic states) coupling. However, some quantitative agreement between theory and experiment is still lacking, which can be settled through an elaborate and more refined (over a fine mesh of molecular orientation) computations within the VCC-RIOSA framework. A summary of the present study is given at the end with the concluding remarks and the future direction of research followed by bibliography.
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Skone, Jonathan H. Hammes-Schiffer Sharon. « Quantum mechanical methods for calculating proton tunneling splittings and proton-coupled electron transfer vibronic couplings ». 2008. http://www.etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-2481/index.html.

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(7046690), Chuan-Hsun Li. « Bose-Einstein Condensates in Synthetic Gauge Fields and Spaces : Quantum Transport, Dynamics, and Topological States ». Thesis, 2019.

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Bose-Einstein condensates (BECs) in light-induced synthetic gauge fields and spaces can provide a highly-tunable platform for quantum simulations. Chapter 1 presents a short introduction to the concepts of BECs and our BEC machine. Chapter 2 introduces some basic ideas of how to use light-matter interactions to create synthetic gauge fields and spaces for neutral atoms. Three main research topics of the thesis are summarized below.

Chapter 3: Recently, using bosonic quasiparticles (including their condensates) as spin carriers in spintronics has become promising for coherent spin transport over macroscopic distances. However, understanding the effects of spin-orbit (SO) coupling and many-body interactions on such a spin transport is barely explored. We study the effects of synthetic SO coupling (which can be turned on and off, not allowed in usual materials) and atomic interactions on the spin transport in an atomic BEC.

Chapter 4: Interplay between matter and fields in physical spaces with nontrivial geometries can lead to phenomena unattainable in planar spaces. However, realizing such spaces is often impeded by experimental challenges. We synthesize real and curved synthetic dimensions into a Hall cylinder for a BEC, which develops symmetry-protected topological states absent in the planar counterpart. Our work opens the door to engineering synthetic gauge fields in spaces with a wide range of geometries and observing novel phenomena inherent to such spaces.

Chapter 5: Rotational properties of a BEC are important to study its superfluidity. Recent studies have found that SO coupling can change a BEC's rotational and superfluid properties, but this topic is barely explored experimentally. We study rotational dynamics of a SO-coupled BEC in an effective rotating frame induced by a synthetic magnetic field. Our work may allow for studying how SO coupling modify a BEC's rotational and superfluid properties.

Chapter 6 presents some possible future directions.

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Livres sur le sujet "Quantum Mechanical Coupling"

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Siebold, Christian Trenkel. Development of a superconducting torsion balance designed to search for a new short-range force coupling quantum-mechanical spin and matter. Birmingham : University of Birmingham, 1997.

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Ahia, Francis. Coupling constant threshold in non-relativistic quantum mechanics : A singular perturbation problem. Toronto : [s.n.], 1992.

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3

Horing, Norman J. Morgenstern. Schwinger Action Principle and Variational Calculus. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198791942.003.0004.

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Chapter 4 introduces the Schwinger Action Principle, along with associated particle and potential sources. While the methods described here originally arose in the relativistic quantum field theory of elementary particle physics, they have also profoundly advanced our understanding of non-relativistic many-particle physics. The Schwinger Action Principle is a quantum-mechanical variational principle that closely parallels the Hamilton Principle of Least Action of classical mechanics, generalizing it to include the role of quantum operators as generalized coordinates and momenta. As such, it unifies all aspects of quantum theory, incorporating Hamilton equations of motion for those operators and the Heisenberg equation, as well as producing the canonical equal-time commutation/anticommutation relations. It yields dynamical coupled field equations for the creation and annihilation operators of the interacting many-body system by variational differentiation of the Hamiltonian with respect to the field operators. Also, equations for the development of matrix elements (underlying Green’s functions) are derived using variations with respect to particle and potential “sources” (and coupling strength). Variational calculus, involving impressed potentials, c-number coordinates and fields, also quantum operator coordinates and fields, is discussed in full detail. Attention is given to the introduction of fermion and boson particle sources and their use in variational calculus.
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Kachelriess, Michael. Quantum mechanics. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198802877.003.0002.

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After a brief review of the operator approach to quantum mechanics, Feynmans path integral, which expresses a transition amplitude as a sum over all paths, is derived. Adding a linear coupling to an external source J and a damping term to the Lagrangian, the ground-state persistence amplitude is obtained. This quantity serves as the generating functional Z[J] for n-point Green functions which are the main target when studying quantum field theory. Then the harmonic oscillator as an example for a one-dimensional quantum field theory is discussed and the reason why a relativistic quantum theory should be based on quantum fields is explained.
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Tiwari, Sandip. Electromechanics and its devices. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198759874.003.0005.

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Electromechanics—coupling of mechanical forces with others—exhibits a continuum-to-discrete spectrum of properties. In this chapter, classical and newer analysis techniques are developed for devices ranging from inertial sensors to scanning probes to quantify limits and sensitivities. Mechanical response, energy storage, transduction and dynamic characteristics of various devices are analyzed. The Lagrangian approach is developed for multidomain analysis and to bring out nonlinearity. The approach is extended to nanoscale fluidic systems where nonlinearities, fluctuation effects and the classical-quantum boundary is quite central. This leads to the study of measurement limits using power spectrum and, correlations with slow and fast forces. After a diversion to acoustic waves and piezoelectric phenomena, nonlinearities are explored in depth: homogeneous and forced conditions of excitation, chaos, bifurcations and other consequences, Melnikov analysis and the classic phase portaiture. The chapter ends with comments on multiphysics such as of nanotube-based systems and electromechanobiological biomotor systems.
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Glazov, M. M. Interaction of Spins with Light. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198807308.003.0006.

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This chapter presents the details of the optical manipulation of electron spin states. It also addresses manifestations of the electron and nuclear spin dynamics in optical response of semiconductor nanostructures via spin-Faraday and -Kerr effects. Coupling of spins with light provides the most efficient method of nonmagnetic spin manipulation. The main aim of this chapter is to provide the theoretical grounds for optical spin injection, ultrafast spin control, and readout of spin states by means of circularly and linearly polarized light pulses. The Faraday and Kerr effects induced by the electron and nuclear spin polarization are analyzed both by means of a macroscopic, semi-phenomenological approach and by using the microscopic quantum mechanical model. Theoretical analysis is supported by experimental data.
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7

Ahia, Francis. Coupling constant threshold in non-relativistic quantum mechanics : a singular perturbation problem. 1992.

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8

Strasberg, Philipp. Quantum Stochastic Thermodynamics. Oxford University PressOxford, 2022. http://dx.doi.org/10.1093/oso/9780192895585.001.0001.

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Abstract Processes at the nanoscale happen far away from the thermodynamic limit, far from equilibrium and are dominated by fluctuations and, perhaps, even quantum effects. This book establishes a consistent thermodynamic framework for such processes by combining tools from non-equilibrium statistical mechanics and the theory of open quantum systems. The book is accessible for graduate students and of interest to all researchers striving for a deeper understanding of the laws of thermodynamics beyond their traditional realm of applicability. It puts most emphasis on the microscopic derivation and understanding of key principles and concepts as well as their interrelation. The topics covered in this book include (quantum) stochastic processes, (quantum) master equations, local detailed balance, classical stochastic thermodynamics, (quantum) fluctuation theorems, strong coupling and non non-Markovian effects, thermodynamic uncertainty relations, operational approaches, Maxwell's demon and time-reversal symmetry, among other topics. Furthermore, the book treats a few applications in detail to illustrate the general theory and its potential for practical applications. These are single-molecule pulling experiments, quantum transport and thermoelectric effects in quantum dots, the micromaser and related set-ups in quantum optics.
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Zinn-Justin, Jean. Quantum Field Theory and Critical Phenomena. 5e éd. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198834625.001.0001.

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Introduced as a quantum extension of Maxwell's classical theory, quantum electrodynamic (QED) has been the first example of a quantum field theory (QFT). Eventually, QFT has become the framework for the discussion of all fundamental interactions at the microscopic scale except, possibly, gravity. More surprisingly, it has also provided a framework for the understanding of second order phase transitions in statistical mechanics. In fact, as hopefully this work illustrates, QFT is the natural framework for the discussion of most systems involving an infinite number of degrees of freedom with local couplings. These systems range from cold Bose gases at the condensation temperature (about ten nanokelvin) to conventional phase transitions (from a few degrees to several hundred) and high energy particle physics up to a TeV, altogether more than twenty orders of magnitude in the energy scale. Therefore, although excellent textbooks about QFT had already been published, I thought, many years ago, that it might not be completely worthless to present a work in which the strong formal relations between particle physics and the theory of critical phenomena are systematically emphasized. This option explains some of the choices made in the presentation. A formulation in terms of field integrals has been adopted to study the properties of QFT. The language of partition and correlation functions has been used throughout, even in applications of QFT to particle physics. Renormalization and renormalization group (RG) properties are systematically discussed. The notion of effective field theory (EFT) and the emergence of renormalizable theories are described. The consequences for fine-tuning and triviality issue are emphasized. This fifth edition has been updated and fully revised.
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Mashhoon, Bahram. Acceleration Kernel. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198803805.003.0003.

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The phenomenon of spin-rotation coupling provides the key to the determination of the kernel. Imagine an observer rotating in the positive sense about the direction of propagation of an incident plane monochromatic electromagnetic wave of positive helicity. Using the locality postulate, the field as measured by the rotating observer can be determined. If the observer rotates with the same frequency as the wave, the measured radiation field loses its temporal dependence. By a mere rotation, observers could in principle stay at rest with respect to an incident positive-helicity wave. To avoid this possibility, we assume that a basic radiation field cannot stand completely still with respect to an accelerated observer. This basic principle eventually leads to the determination of the kernel and a nonlocal theory of accelerated systems that is in better agreement with quantum mechanics than the standard theory based on the hypothesis of locality.
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Chapitres de livres sur le sujet "Quantum Mechanical Coupling"

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Scrocco, E. « Quantum Mechanical Interpretation of Nuclear Quadrupole Coupling Data ». Dans Advances in Chemical Physics, 319–52. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470143513.ch7.

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Chipman, Daniel M. « Magnetic Hyperfine Coupling Constants in Free Radicals ». Dans Quantum Mechanical Electronic Structure Calculations with Chemical Accuracy, 109–38. Dordrecht : Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0193-6_3.

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Schulten, K. « Curve Crossing in a Protein : Coupling of the Elementary Quantum Process to Motions of the Protein ». Dans Quantum Mechanical Simulation Methods for Studying Biological Systems, 85–118. Berlin, Heidelberg : Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-662-09638-3_4.

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Unekis, Michael J., David W. Schwenke, Nancy Mullaney Harvey et Donald G. Truhlar. « RMPROP : A Computer Program for Quantum Mechanical Close Coupling Calculations for Inelastic Collisions ». Dans Modem Techniques in Computational Chemistry : MOTECC-91, 749–72. Dordrecht : Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3032-5_17.

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Li, J., P. Beroza, L. Noodleman et D. A. Case. « Quantum Mechanical Modeling of Active Sites in Metalloproteins. Electrostatic Coupling to the Protein/Solvent Environment ». Dans Molecular Modeling and Dynamics of Bioinorganic Systems, 279–306. Dordrecht : Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5171-9_13.

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Hecht, K. T. « Angular Momentum Coupling Theory ». Dans Quantum Mechanics, 263–68. New York, NY : Springer New York, 2000. http://dx.doi.org/10.1007/978-1-4612-1272-0_27.

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Grandy, Walter T. « Electromagnetic Coupling ». Dans Relativistic Quantum Mechanics of Leptons and Fields, 71–108. Dordrecht : Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3302-9_3.

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Gröblacher, Simon. « Opto-Mechanics in the Strong Coupling Regime ». Dans Quantum Opto-Mechanics with Micromirrors, 123–32. Berlin, Heidelberg : Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-34955-3_6.

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Aragone, Carlos, et J. Stephany. « Non-Abelian Chern-Simons Topological Coupling from Self-Interaction ». Dans Quantum Mechanics of Fundamental Systems 1, 27–32. Boston, MA : Springer US, 1988. http://dx.doi.org/10.1007/978-1-4899-3728-5_3.

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Erdős, László. « Linear Boltzmann Equation as the Weak Coupling Limit of the Random Schrödinger Equation ». Dans Mathematical Results in Quantum Mechanics, 233–42. Basel : Birkhäuser Basel, 1999. http://dx.doi.org/10.1007/978-3-0348-8745-8_20.

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Actes de conférences sur le sujet "Quantum Mechanical Coupling"

1

Khare, Roopam, Steven Mielke, Jeffrey Paci, Sulin Zhang, George Schatz et Ted Belytschko. « Two quantum mechanical/molecular mechanical coupling schemes appropriate for fracture mechanics studies ». Dans 48th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-2171.

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Makowski, J. D., B. D. Anderson, W. S. Chan, M. J. Saarinen, C. J. Palmstrom et J. J. Talghader. « Coupling of quantum states with mechanical heterostructures ». Dans TRANSDUCERS 2009 - 2009 International Solid-State Sensors, Actuators and Microsystems Conference. IEEE, 2009. http://dx.doi.org/10.1109/sensor.2009.5285457.

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Verhagen, Ewold, Samuel Deleglise, Stefan Weis, Albert Schliesser et Tobias J. Kippenberg. « Cavity quantum optomechanics : Coupling light and micromechanical oscillators ». Dans 2014 IEEE 27th International Conference on Micro Electro Mechanical Systems (MEMS). IEEE, 2014. http://dx.doi.org/10.1109/memsys.2014.6765593.

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Sidhu, Mehra S., et Kamal P. Singh. « Spin based magneto-mechanical coupling of nanoscale glass cantilevers for quantum sensing ». Dans Optical Sensors. Washington, D.C. : OSA, 2020. http://dx.doi.org/10.1364/sensors.2020.stu3d.3.

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Verhagen, Ewold, Samuel Deléglise, Stefan Weis, Albert Schliesser et Tobias J. Kippenberg. « Quantum-Coherent Coupling of a Mechanical Oscillator to an Optical Cavity Mode ». Dans CLEO : Applications and Technology. Washington, D.C. : OSA, 2012. http://dx.doi.org/10.1364/cleo_at.2012.jm1k.1.

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Labeyrie, G., P. Gomes, E. Tesio, R. Kaiser, W. Firth, G. Robb, G. L. Oppo et T. Ackemann. « Transverse self-organization in cold atoms due to opto-mechanical coupling ». Dans 2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE/IQEC. IEEE, 2013. http://dx.doi.org/10.1109/cleoe-iqec.2013.6801786.

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Li, Haibao, et Libo Yuan. « Quantum opto-mechanical coupling model for fiber micro-cantilever beam damping noise reduction ». Dans Fifth Asia Pacific Optical Sensors Conference, sous la direction de Byoungho Lee, Sang-Bae Lee et Yunjiang Rao. SPIE, 2015. http://dx.doi.org/10.1117/12.2184002.

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Ozkan, Cengiz S. « Assembly at the Nanoscale : Heterojunctions of Carbon Nanotubes and Nanocrystals (Keynote) ». Dans ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-82363.

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This paper reports the controlled synthesis of multi-walled Carbon Nanotube-Quantum Dot (CNT-QD) heterojunctions using the Ethylene Carbodiimide Coupling procedure (EDC). Thiol stabilized ZnS capped CdSe quantum dots containing amine terminal groups (QD-NH2) were conjugated with acid treated Multi-Walled Carbon Nanotubes (MWCNT) ranging from 400 nm to 4μm in length. SEM, TEM, EDS and FTIR were used to characterize the conjugation process.
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Koch, S. W., F. Jahnke et H. C. Schneider. « Theory of Semiconductor Microcavities and Lasers ». Dans Quantum Optoelectronics. Washington, D.C. : Optica Publishing Group, 1995. http://dx.doi.org/10.1364/qo.1995.qfb1.

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A fully quantum mechanical theory for the coupled electron-hole-pair and photon dynamics of semiconductor microcavity systems is presented. Based on a nonequilibrium Green’s functions approach, the carrier system is described by a generalized Boltzmann equation which includes contributions for carrier generation, carrier scattering by other carriers and phonons, as well as the spontaneous and stimulated recombination. The photon dynamics is described in terms of coupling to the carriers as well as by the mode confinement through the cavity. The many-body Coulomb effects are included on the level of a screened Hartree-Fock approximation.
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Li, You-Quan. « Spin current and spin Hall effects ». Dans Workshop on Entanglement and Quantum Decoherence. Washington, D.C. : Optica Publishing Group, 2008. http://dx.doi.org/10.1364/weqd.2008.asi1.

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In terms of SU(2) Yang-Mills field formulism, we give a nature definition of spin current for the systems with Rashba or Dresselhaus spin-orbit couplings etc., and we obtain a covariant form of continuity equations for the corresponding spin current [1]. The traditional Kubo formula is generalized to describe the linear response with respect to non-Abelian fields. We find that the covariant form we proposed plays an essential role in guaranteeing the consistency of SU(2) Kubo formula [2]. We also derive the classical counterpart of quantum mechanical covariant “continuity-like” equation for the spin current, and present an intuitive picture for elucidating the non-conservation of the spin current [3]. We discuss the spin-relaxation time for two-dimensional systems with a hierarchy of spin-orbit couplings, and found that the spin-relaxation time can be infinite if the coupling strengths certain condition which correspond to the vanishing Yang-Mills “magnetic” field [4].
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