Gotowa bibliografia na temat „Effets topologiques”
Utwórz poprawne odniesienie w stylach APA, MLA, Chicago, Harvard i wielu innych
Spis treści
Zobacz listy aktualnych artykułów, książek, rozpraw, streszczeń i innych źródeł naukowych na temat „Effets topologiques”.
Przycisk „Dodaj do bibliografii” jest dostępny obok każdej pracy w bibliografii. Użyj go – a my automatycznie utworzymy odniesienie bibliograficzne do wybranej pracy w stylu cytowania, którego potrzebujesz: APA, MLA, Harvard, Chicago, Vancouver itp.
Możesz również pobrać pełny tekst publikacji naukowej w formacie „.pdf” i przeczytać adnotację do pracy online, jeśli odpowiednie parametry są dostępne w metadanych.
Artykuły w czasopismach na temat "Effets topologiques"
Brosseau, Marc. "L’espace littéraire en l’absence de description". Cahiers de géographie du Québec 52, nr 147 (13.05.2009): 419–37. http://dx.doi.org/10.7202/029869ar.
Pełny tekst źródłaPacaud, Jean-Michel. "Étude du genre Campanile Fischer, 1884 (Mollusca : Gastropoda : Campanilidae). 1. Description d’une espèce nouvelle du Miocène supérieur du Cap Amparafaka (Madagascar)". BSGF - Earth Sciences Bulletin 191 (2020): 21. http://dx.doi.org/10.1051/bsgf/2020022.
Pełny tekst źródłaDoucet, J. P., A. Panaye, Shen Gang Yuan i J. E. Dubois. "Évolution des effets α-fonctionnels en RMN13C. application du modèle topologique darc-pulfo en série alicyclique". Journal de Chimie Physique 82 (1985): 607–11. http://dx.doi.org/10.1051/jcp/1985820607.
Pełny tekst źródłaAppell, Jürgen, i Espedito de Pascale. "Theoremes de Bornage Pour L'Operateur de Nemyckii Dans Les Espaces Ideaux". Canadian Journal of Mathematics 38, nr 6 (1.12.1986): 1338–55. http://dx.doi.org/10.4153/cjm-1986-068-3.
Pełny tekst źródłaTacnet, Jean-Marc, Elodie Forestier, Eric Mermet, Corinne Curt i Frédéric Berger. "Résilience territoriale : du concept à l'analyse d'infrastructures critiques en montagne". La Houille Blanche, nr 5-6 (październik 2018): 20–28. http://dx.doi.org/10.1051/lhb/2018047.
Pełny tekst źródłaAncori, Bernard. "Espace-temps d’un réseau sociocognitif complexe. II : Temporalités historiques et entropie sociocognitive". Nouvelles perspectives en sciences sociales 4, nr 1 (13.01.2009): 9–76. http://dx.doi.org/10.7202/019639ar.
Pełny tekst źródłaBoi, Luciano. "Generazione e visualizzazione delle forme nello spazio: proprietà topologiche e percezione di superfici geometriche". Visible, nr 9 (5.05.2023). http://dx.doi.org/10.25965/visible.464.
Pełny tekst źródłaBernardi, Olivier, i Guillaume Chapuy. "Counting unicellular maps on non-orientable surfaces". Discrete Mathematics & Theoretical Computer Science DMTCS Proceedings vol. AN,..., Proceedings (1.01.2010). http://dx.doi.org/10.46298/dmtcs.2859.
Pełny tekst źródłaShields, Rob. "The Bridge Spanning Past, Present, and Future: Time Infrastructure". Canadian Journal of Communication 46, nr 2 (21.06.2021). http://dx.doi.org/10.22230/cjc.2021v46n2a3829.
Pełny tekst źródłaRozprawy doktorskie na temat "Effets topologiques"
Mallet, François. "Cohérence quantique, diffusion magnétique et effets topologiques". Grenoble 1, 2006. https://theses.hal.science/tel-00546850.
Pełny tekst źródłaIn this thesis are reported experimental results centered on the thematic of the electronic quantum coherence at very low temperatures, obtained by very precise measurements of the quantum correction to the classical electronic transport in metallic nanostructures. We have first studied the coherence effects in network of metallic one-dimensional wires. We have shown the influence on the coherence itself of the diffusion dimensionality. By going from a macroscopic conductor to a purely mesoscopic one, we measured a crossover in the scaling of the quantum corrections amplitudes when the phase coherence length exceed the typical size of the system. This has allowed us to really precise what the ensemble averaging is in Mesoscopic Physics. In the second part of this work, we have shown the temperature dependence of the phase coherence length in metallic wire with magnetic impurities. These samples were fabricated in a very new and controlled way, by using a new technics with a focus ion beam. We have measured a universal behavior over 2 decades in temperature for the dephasing due to one magnetic impurity. This was the direct prove that this added decoherence belongs to the physics of the generic many body problem named « Kondo Physics ». We have finally shown that the measured dephasing rate was in excellent agreement with recent theoretical calculations based one the numerical renormalization group technics. More precisely we have shown that the magnetic impurities screening induces a linear desaturation of the phase coherence time above 0,1 TK
Bauchy, Mathieu, i Matthieu Micoulaut. "Contraintes topologiques et rigidité dans les verres". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2012. http://tel.archives-ouvertes.fr/tel-00805762.
Pełny tekst źródłaShevtsov, Oleksii. "Contribution à la théorie du transport quantique : isolants topologiques à base de graphène et phénomènes à fréquence finie". Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-00770160.
Pełny tekst źródłaHarman-Clarke, Adam. "Contraintes Topologiques et Ordre dans les Systèmes Modèle pour le Magnétisme Frustré". Thesis, Lyon, École normale supérieure, 2011. http://www.theses.fr/2011ENSL0659.
Pełny tekst źródłaIn this thesis a series of model frustrated magnets have been investigated. Their common parent is the spin ice model, which is transformed into the kagome ice and square ice models in two-dimensions, and an Ising spin chain model in one-dimension. These models have been examined with particular interest in the spin ordering transitions induced by constraints on the system: a topological constraint leads, under appropriate conditions, to the Kasteleyn transition in kagome ice and a lattice freezing transition is observed in square ice which is due to a ferromagnetic ordering transition in an Ising chain induced solely by finite size effects. In all cases detailed Monte Carlo computational simulations have been carried out and compared with theoretical expressions to determine the characteristics of these transitions. In order to correctly simulate the kagome ice model a loop update algorithm has been developed which is compatible with the topological constraints in the system and permits the simulation to remain strictly on the groundstate manifold within the appropriate topological sector of the phase space. A thorough survey of the thermodynamic and neutron scattering response of the kagome ice model influenced by an arbitrary in-plane field has led to a deeper understanding of the Kasteleyn transition, and a computational model that can predict neutron scattering patterns for kagome ice materials under any experimental conditions. This model has also been shown to exhibit quantised thermodynamic properties under appropriate conditions and should provide a fertile testing ground for future work on the consequences of topological constraints and topological phase transitions. A combined investigation into the square ice and Ising chain models has revealed ordering behaviour within the lattice that may be decoupled from underlying ferro- magnetic ordering and is particularly relevant to magnetic nanoarrays
Badiane, Mouhamadou Driss. "Propriétés hors équilibre des jonctions Josephson multi-terminales et topologiques". Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENY057.
Pełny tekst źródłaThis PhD thesis manuscript deals with the non equilibrium transport properties of superconducting meso-scopic systems. This study declines in two shutters : i) signatures of Majorana fermions in topological Josephsonjunctions and ii) current-current correlations in three-terminal Josephson junctions.Majorana fermions appears at the boundaries of topological superconductors. When two topological su-perconductors are connected to form a Josephson junction, the zero-energy Majorana bound states localizedon either side of the junction form an Andreev bound state. As this current carrying state is 4π-periodic inthe superconducting phase difference, it was speculated that, at finite dc bias voltage, the junction exhibits afractional Josephson effect. We show that any finite phase velocity induces a dynamic coupling between thebound state and the continuum of states above the superconducting gap amplitude. This intrinsic couplingprovides an unavoidable mechanism that alters the fractional Josephson effect. We discuss, in terms of thecircuit parameters, signatures of the fractional Josephson effect that could be relevant for current experimen-tal investigations : the even-odd effect in Shapiro steps and the emergence of a peak at fractional Josephsonfrequency in the current noise spectrum. Furthermore, other manifestations of the Majorana bound states onthe subgap current-voltage characteristic are discussed.In a second step, we discuss the dissipative current fluctuations in three terminal Josephson junctions. Weshow that, current-current cross correlations can be positive and amplified in a coherent regime. This findingopens the possibility for further investigations on quantum entanglement in those systems
Repellin, Cécile. "Numerical study of fractional topological insulators". Thesis, Paris, Ecole normale supérieure, 2015. http://www.theses.fr/2015ENSU0028/document.
Pełny tekst źródłaTopological insulators are band insulators which are fundamentally different from atomic insulators. Only a non-local quantity called topological invariant can distinguish these two phases. The quantum Hall effect is the first example of a topological insulator, but the same phase can arise in the absence of a magnetic field, and is called a Chern insulator. In the presence of strong interactions, topological insulators may host exotic excitations called anyons. The fractional quantum Hall effect is the only experimentally realized example of such phase. In this manuscript, we study the conditions of emergence of different types of fractional topological insulators, using numerical simulations. We first look at the fractional quantum Hall effect on the torus. We introduce a new projective construction of exotic quantum Hall states that complements the existing construction. We study the low energy excitations on the torus of two of the most emblematic quantum Hall states, the Laughlin and Moore-Read states. We propose and validate model wave functions to describe them. We apply this knowledge to characterize the excitations of the Laughlin state in Chern insulators. We show the stability of other fractional quantum Hall states in Chern insulators, the composite fermion, Halperin and NASS states. We explore the physics of fractional phases with no equivalent in a quantum Hall system, using two different strategies: first by choosing a model with a higher value of the topological invariant, second by adding time-reversal symmetry, which changes the nature of the topological invariant
Adroguer, Pierre. "Propriétés de transport électronique des isolants topologiques". Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2013. http://tel.archives-ouvertes.fr/tel-00832048.
Pełny tekst źródłaThomas, Candice. "Strained HgTe/CdTe topological insulators, toward spintronic applications". Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAY090/document.
Pełny tekst źródłaWith graphene-like transport properties governed by massless Dirac fermions and a topological protection preventing from backscattering phenomena, topological insulators, characterized by an insulating bulk and conducting surfaces, are of main interest to build low power consumption electronic building-blocks of primary importance for future electronics.Indeed, the absence of disorder, the generation of dissipation-less spin-polarized current or even the possibility to generate pure spin current without magnetic materials are some of the promises of these new materials.The objective of this PhD thesis has been to experimentally demonstrate the eligibility of HgTe three dimensional topological insulator system for applications and especially for spintronics.To do so, strong efforts have been dedicated to the improvement of the growth process by molecular beam epitaxy.Chemical composition, strain, defect density and sharpness of the HgTe interfaces have been identified as the major parameters of study and improvement to ensure HgTe inverted band structure, bulk gap opening and to emphasize the resulting topological surface state electronic properties. Verification of the topological nature of this system has then been performed using low temperature magneto-transport measurements of Hall bars designed with various HgTe thicknesses. It is worth noting that the high desorption rate of Hg has made the nanofabrication process more complex and required the development of a low temperature process adapted to this constraint. While the thicker samples have evidenced very complex transport signatures that need to be further investigated and understood, the thickness reduction has led to the suppression of any additional contributions, such as bulk or even side surfaces, and the demonstration of quantum Hall effect with vanishing resistance. Consequently, we have managed to demonstrate direct evidences of Dirac fermions by temperature dependent analysis of the quantum Hall effect. The next step has been to use the topological properties and especially the locking predicted between momentum and spin to test the HgTe potential for spintronics. Spin pumping experiments have demonstrated the power of these topological structures for spin injection and detection. Moreover, the implementation of HgTe into simple p-n junction has also been investigated to realize a first spin-based logic element
Le, calvez Kévin. "Signatures of a 4pi periodic Andreev bound state in topological Josephson junctions". Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAY099/document.
Pełny tekst źródłaThree dimensional topological insulators (3D TI) are a new state of matter composedof an electrically insulating bulk covered by metallic surface states. Theoretically, a topo-logical Josephson junction composed of these surface states can host an Andreev Boundstate (ABS) that has twice the periodicity of the conventional 2p periodic ABSs. The4p periodic ABS is expected to be the building block of topological quantum computing.Therefore, we study the dynamic of this particular ABS by performing Shapiro measure-ment on Josephson junctions built with bismuth based 3D TI.To identify the e?ects of a 4p periodic ABS in a Shapiro measurement, we use a phe-nomenological model that simulates the voltage-current characteristics of a TJJ. We predicttwo signatures of the 4p periodic ABS and estimate their robustness against Joule heatingand thermally activated quasiparticle poisoning of the 4p periodic mode.We study the Josephson junctions dynamics by performing Shapiro measurements onjunctions built on Bi2Se3. We observe the two previously anticipated signatures, whichare the non-conventional appearance order of the Shapiro steps and the remaining of asupercurrent at the closing of the Shapiro step n = 0. They prove the presence of a 4pperiodic ABS.We also study the topological insulator BiSbTeSe2 that we have grown by using themelting growth method. By superconducting interferometric measurements, we show asuperconducting surface transport without bulk electronic conduction
Vistoli, Lorenzo. "Topological and electronic properties of electron-doped manganite thin films". Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS113.
Pełny tekst źródłaOxide thin films feature a wide range of physical phenomena and rich phase diagrams tunable by strain and interface engineering. CaMnO3, in particular, is extremely sensitive to both doping and strain and, when grown with compressive strain, transitions from an insulating and antiferromagnetic state to a metallic and weakly ferromagnetic state at only 2% Ce doping.We used a combination of angle-resolved photoemission spectroscopy, magnetotransport, and density functional theory to study the electronic properties of this material. We observed the existence of two separate charge carriers, light electrons and heavy polarons, whose physical nature differs because of drastically different couplings to phonons. We ascribe these differences to a different relative band filling due to correlations, which enhance greatly the coupling to phonons of the heavy polarons band. Magnetotransport experiments reveal that the polaron band dominates transport despite its lower mobility.Compressive strain also gives rise to a strong magnetic anisotropy which stabilizes magnetic bubbles that accompany a topological Hall effect. This suggests that these bubbles have topological character, i.e. are skyrmion bubbles. The topological Hall effect diverges as the manganite approaches the metal-insulator transition at low dopings. We used a recently developed theory in order to interpret this behavior, and we conclude that correlations may come into play, enhancing the effective mass of the carriers, and in turn the topological Hall effect.As this manganite is highly sensitive to changes in doping and carrier density, we grew BiFeO3/(Ca,Ce)MnO3 ferroelectric field-effect transistors. Upon switching the ferroelectric polarization of the BiFeO3 top layer, we could not observe any sizable changes in the properties of the underlying manganite layers. We used transmission electron microscopy to study the properties of these bilayers with an atomic resolution, and we observed that polarization pinning at the BiFeO3/(Ca,Ce)MnO3 impedes a complete switch of the polarization and so reduces the operational capabilities of these devices. Nevertheless, we could detect modifications of the electronic properties of the manganite induced by polarization reversal at the atomic scale