Дисертації з теми "Fermion interactions"
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Thornton, Andrew M. "Studies of lattice fermion-scalar interactions." Thesis, University of Edinburgh, 1989. http://hdl.handle.net/1842/14539.
Повний текст джерелаShively, William F. Khveshchenko D. V. "Novel behaviors in fermion systems with point-like Fermi surfaces and singular interactions." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2006. http://dc.lib.unc.edu/u?/etd,439.
Повний текст джерелаTitle from electronic title page (viewed Oct. 10, 2007). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Physics & Astronomy." Discipline: Physics and Astronomy; Department/School: Physics and Astronomy.
Karim, Pour Farshid. "Quantum Monte Carlo studies of fermions with attractive interactions in optical traps." [S.l. : s.n.], 2008. http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-34763.
Повний текст джерелаFraser, Louisa Mairi. "Coulomb interactions and positron annihilation in many fermion systems : a Monte Carlo approach." Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338685.
Повний текст джерелаCurtis, Duncan Charles. "A non-perturbative study of fermion propagators and their interactions in gauge theories." Thesis, Durham University, 1991. http://etheses.dur.ac.uk/6275/.
Повний текст джерелаPfoh, Torsten [Verfasser]. "Electroweak precision observables and effective four-fermion interactions in warped extra dimensions / Torsten Pfoh." Mainz : Universitätsbibliothek Mainz, 2011. http://d-nb.info/1026802652/34.
Повний текст джерелаHowald, Ludovic. "Interactions entre la supraconductivité et la criticité quantique, dans les composés CeCoIn5, URhGe et UCoGe." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00584598.
Повний текст джерелаBaez, Michael Cabrera. "Fundamental electronic and magnetic interactions in the cage compounds RT2Zn20 (R = Y, Gd, Yb, T = Fe, Co)." reponame:Repositório Institucional da UFABC, 2017.
Знайти повний текст джерелаTese (doutorado) - Universidade Federal do ABC, Programa de Pós-Graduação em Física, 2017.
The electronic correlations originated from the Coulomb interactions between electrons play a fundamental role in the establishment of the physical properties of a wide range of materials. For the case of weak correlations, the material can be described within a simplied non-interacting point of view, as in the case of standard metals. Unexpected and intriguing properties are revealed when strong correlations are involved, due to a large number of degrees of freedom in the electronic correlations. As a result of this electronic correlation, it is possible to go from conventional forms of magnetism, passing through superconducting systems and reaching heavy fermion behavior. Members within a single family of compounds can provide all those very dierent ground states, and the opportunity to study and try to understand some of the electronic and magnetic fundamental interactions involved. This thesis is a result of exploring these dierent behaviors that arise from electron-electron correlations, specically in the family of cage compounds RT2Zn20 (R=Y,Gd,Yb and T=Fe,Co). A detailed combination of quantitative macroscopic and microscopic descriptions of the electronic, thermodynamic and magnetic properties of some members of this family were developed. The rst part of this thesis presents a study on Gd3+- doped YCo2Zn20 single crystals (Y1..xGdxCo2Zn20: (0.002 . x 1.00) through a combination of temperature-dependent Electron Spin Resonance (ESR), heat capacity and dc magnetic susceptibility experiments, plus collaborative rst-principles Density Functional Theory (DFT) calculations. The combination of experimental and electronic structure data establish GdCo2Zn20 as a model Ruderman-Kittel-Kasuya-Yosida (RKKY) system by predicting a Curie-Weiss temperature C = ..1:2(2) K directly from microscopic parameters, in very good agreement with the bulk value from magnetization data. The second part involves an exploration of the unconventional ferromagnetic behaviors that have been found in GdFe2Zn20, which has a relatively high ferromagnetic ordering temperature (TC = 86 K) despite being a system with wide separation between Gd3+ ions in a matrix with strong electron-electron correlation. Taking into account those correlations and itinerant molecular eld eects, analysis of our ESR results indicate that the exchange interaction between the Gd3+ is processed via the d-type of electrons at the Fermi level and becomes an exchange interaction of covalent nature (J(0)fd < 0). Our results shows that the RKKY model cannot explain the ferromagnetic behavior of this compound, and a super-exchange-like mechanism is proposed for this magnetic interaction. Increasing a little bit the level of complexity, the third part of this thesis is on the tuning of the electronic properties of the heavy fermion compound YbFe2Zn20 by chemical substitution (Cd doping). With increasing amount of Cd, the hybridization between Yb 4f electrons and the conduction electrons is weakened, which should be accompanied by a valence shift of the Yb3+ due to the negative chemical pressure eect. The combined results demonstrate excellent complementarity between positive physical pressure and negative chemical pressure, and point to a rich playground for exploring the physics of strongly correlated electron systems. Finally, this thesis ends with a general set of conclusions of the explored quantum materials.
Mollet, Simon. "Exploration of 6-dimensional models with non trivial topology and their predictions for fermions masses and mixings, neutrino physics, flavour changing interactions and CP violation." Doctoral thesis, Universite Libre de Bruxelles, 2016. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/230863.
Повний текст джерелаDoctorat en Sciences
info:eu-repo/semantics/nonPublished
Snyman, Izak. "Analysis and applications of the generalised Dyson mapping." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/49829.
Повний текст джерелаENGLISH ABSTRACT: In this thesis, generalized Dyson boson-fermion mappings are considered. These are techniques used in the analysis of the quantum many-body problem, and are instances of so-called boson expansion methods. A generalized Dyson boson-fermion mapping, or a Dyson mapping for short, is a one-to-one linear but non-unitary operator that can be applied to vectors representing the states of a many-fermion system. A vector representing a fermion system maps onto a vector that is most naturally interpreted as representing a state of a many-body system that contains both bosons and fermions. The motivation for doing such a mapping is the hope that the mapping will reveal some property of the system that simplifies its analysis and that was hidden in the original form. The aims of this thesis are 1. to review the theory of generalized Dyson boson-fermion mappings, 2. by considering a tutorial example, to demonstrate that it is feasible to implement the theory and 3. to find a useful application for a generalized Dyson boson-fermion mapping, by considering a non-trivial model, namely the Richardson model for superconductivity. The realization of the first two aims mainly involve the collecting together of ideas that have already appeared in the literature, into one coherent text. Some subtle points that were treated only briefly due to space restrictions in the journal publications where the theory was first expounded, are elaborated on in the present work. On the other hand, the analysis of the Richardson Hamiltonian that uses a Dyson mapping, goes beyond what has already appeared in the literature. It is the first time that a boson expansion technique is implemented for a system where the roles of both collective and non-collective fermion pairs are important. (The Dyson mapping associates bosons with Cooper pairs, while the fermions not bound in Cooper pairs result in fermions being present in the mapped system as well.) What is found is that the Dyson mapping uncovers non-trivial properties of the system. These properties aid the construction of time-independent perturbation expansions for the stationary states of the system, as well as time-dependent expansions for transition amplitudes between states. The time-independent expansions agree with results that other authors obtained through methods other than boson expansions. The time-dependent expansions, that one would be hard-pressed to develop without a Dyson mapping, might in future prove useful in understanding aspects of the dynamics of ultracold fermi gases, when time-dependent magnetic fields are used to vary the atom-atom interaction strenght.
AFRIKAANSE OPSOMMING: In hierdie tesis word veralgemeende Dyson boson-fermion-afbeeldings ondersoek. Hierdie afbeeldings word gebruik in die analise van die kwantum veeldeeltjie probleem, en is voorbeelde van sogenaamde boson-uitbreidingstegnieke. 'n Veralgemeende Dyson bosonfermion- afbeelding, of kortweg 'n Dyson afbeelding, is 'n een-tot-een, lineêre maar nie-unitêre operator wat inwerk op vektore wat toestande verteenwoordig van 'n veel-fermion sisteem. 'n Vektor wat 'n fermionsisteem verteenwoordig word so afgebeeld op 'n vektor waarvoor die mees natuurlike interpretasie is dat dit 'n toestand verteenwoordig van 'n sisteem waarin beide bosone en fermione aanwesig is. So 'n afbeelding word gewoonlik gemaak in die hoop dat eienskappe van die sisteem, wat versteek was in die oorspronklike weergawe, voor-die-hand-liggend is na die afbeelding. Hierdie tesis het ten doel 1. om die teorie van veralgemeende Dyson boson-fermion-afbeeldings te hersien, 2. om 'n eenvoudige voorbeeld deur te werk, en so te demonstreer dat die teorie sonder moeite geïmplimenteer kan word en 3. om 'n nuttige toepassing te vind vir 'n veralgemeende Dyson boson-fermion-afbeelding deur 'n nie-triviale model, naamlik die Richardson model vir supergeleiding, te ondersoek. Die eerste twee van hierdie doelwitte behels hoofsaaklik dat idees wat reeds in die literatuur verskyn het, saamgevat word in een koherente teks. Sommige subtiele punte wat, vanwee beperkte ruimte, slegs kortliks bespreek is in die joernaalartikels waarin die teorie oorspronklik verskyn het, word in hierdie tesis meer breedvoering bespreek. Daarteenoor verteenwoordig die analise van die Richardson model met behulp van 'n Dyson afbeelding 'n nuwe bydra. Dit is naamlik die eerste keer dat 'n bosonuitbreiding ingespan word vir 'n sisteem waar sowel kollektiewe as nie-kollektiewe fermionpare 'n belangrike rol speel. (Die Dyson afbeelding assosieer bosone met die oorspronklike sisteem se Cooper pare, terwyl die fermione wat in die oorspronklike sisteem nie tot Cooper pare gebind is nie, sorg dat daar ook fermione teenwoordig is in die afgebeelde sisteem.) Ons vind dat die Dyson afbeelding nie-triviale eienskappe van die sisteem aan die lig bring. Hierdie eienskappe is nuttig vir die konstruksie van beide tyd-onafhanklike steuringsreekse vir die stasionêre toestande van die sisteem en vir tyd-afhanklike steuringsreekse vir oorgangsamplitudes tussen toestande. Die tyd-onafhanklike uitbreidings stem ooreen met resultate wat ander outeurs afgelei het sonder die gebruik van 'n Dyson afbeelding. Die tyd-afhanklike uitbreidings, wat kwalik afgelei kan word sonder 'n Dyson afbeelding, mag vorentoe nuttig wees om aspekte van die dinamika van baie koue Fermi gasse te verstaan, wanneer tydafhanklike magneetvelde gebruik word om die inter-atoomwisselwerking te manipuleer.
Halfpap, Ole. "Quantum diffusion and scaling of localized interacting electrons." [S.l. : s.n.], 2000. http://www.sub.uni-hamburg.de/disse/317/thesis.pdf.
Повний текст джерелаAllais, Andrea. "Interacting fermions : a holographic approach/." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/83828.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (page 59).
Most materials are either metals or insulators. When they are metals, their electronic properties are usually described by Landau's Fermi liquid theory. That is, they behave more or less like a free Fermi gas, with a few modifications due to electron-electron interactions. However, there exist a few metallic materials whose phenomenology does not fit within Fermi liquid theory. These are quasi-2D metals on the verge of becoming insulators, and they happen to become superconducting at low temperature, by a mechanism different than BCS superconductivity. The physics of these materials calls for a new strongly coupled universality class of interacting electrons, yet to be understood. This work looks at the problem from the novel point of view of gauge/gravity, or holographic, duality.
by Andrea Allais.
Ph.D.
Disertori, Margherita. "Renormalisation constructive des fermions en interaction." Palaiseau, Ecole polytechnique, 1999. http://www.theses.fr/1999EPXX0038.
Повний текст джерелаUrlichs, Konrad. "Baryons and baryonic matter in four-fermion interaction models." [S.l.] : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=983572755.
Повний текст джерелаHofmann, Johannes Benedict. "Exact relations for strongly interacting fermions." Thesis, University of Cambridge, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648470.
Повний текст джерелаZANCHI, DRAZEN. "Fermions en faible interaction sur un reseau bidimensionnel." Paris 11, 1996. http://www.theses.fr/1996PA112284.
Повний текст джерелаChin, Jit Kee. "Strongly-interacting fermions in an optical lattice." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/45417.
Повний текст джерелаIncludes bibliographical references (p. 131-138).
Two sets of studies are described in this thesis. The first describes studies conducted with sodium Bose-Einstein condensates (BEC) while the second focuses on the pairing of fermionic lithium-6 pairs in an optical lattice within the strongly interacting BEC-BCS regime. Common to both sets of studies is the use of a magnetically tunable Feshbach resonance to manipulate interactions between the atoms. In the first experiment, we destabilize a sodium BEC by switching its interactions from repulsive to attractive and studied the resulting dynamics. A local amplification of low momentum energetic instabilities was observed and the measured rate of amplification agreed well with theoretical predictions. For large condensates, this process depleted the condensate faster than the global inward collapse. Subsequently, I describe the major construction effort that was undertaken to convert our BEC machine to a two-species machine capable of cooling fermionic lithium-6. Upon its completion, we obtained a resonance superfluid of loosely bound 6Li pairs in the BECBCS crossover. When placed in a shallow optical lattice, long range phase coherence of this resonance superfluid was inferred from the presence of sharp interference peaks after ballistic expansion. With this observation we have obtained the first evidence of superfluidity of fermions in an optical lattice. A loss in phase coherence occurred when the lattice depth was increased past a critical value, possibly signaling a transition to an insulating state. Further preliminary explorations of this novel system is described followed by an outline of its potential for studying condensed matter phenomena like high temperature superconductivity.
by Jit Kee Chin.
Ph.D.
Dusuel, Sébastien. "Déformation de la surface de Fermi pour un système fortement anisotrope d'électrons en interaction." Paris 7, 2002. https://tel.archives-ouvertes.fr/tel-00002124.
Повний текст джерелаKeil, Werner H. "On a 1 + 1 - dimensional interacting soliton-fermion system with supersymmetry." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/24825.
Повний текст джерелаScience, Faculty of
Physics and Astronomy, Department of
Graduate
Whitehead, Thomas Michael. "Interacting Fermi gases." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/274548.
Повний текст джерелаNaïdja, Houda. "Etude microscopique de systèmes fermioniques finis : corrélations dans les noyaux atomiques et gaz d'électrons confinés par un potentiel harmonique en présence d'un champ magnétique." Thesis, Bordeaux 1, 2009. http://www.theses.fr/2009BOR13762/document.
Повний текст джерелаWithin the framework of the so-called Higher Tamm Dancoff Approxiamtion (HTDA), we have studied the quadrupole vibrational correlations with and without pairing correlations. The mean field has been determined within a microscopic approach using the Skyrme effective interaction. A schematic residual interaction of the delta plus quadrupole-quadrupole type, allowing in particular neutron-proton T=0 and T=1 pairing, has been used. The results which have been obtained for the isoscalar quadrupole giant resonance of the Ca40 have been compared with the experimental data. A fermion gaz trapped in a 2D harmonic oscillator well at zero temperature and in the presence of a uniform magnetic field has been investigated. Exact expressions of some thermodynamic quantities have been derived from the Bloch density matrix
Dos, Santos Luiz Henrique Bravo. "Topological Properties of Interacting Fermionic Systems." Thesis, Harvard University, 2012. http://dissertations.umi.com/gsas.harvard:10195.
Повний текст джерелаPhysics
Feld, Michael. "Low temperature phases of interacting fermions in two dimensions." Thesis, University of Cambridge, 2011. https://www.repository.cam.ac.uk/handle/1810/252257.
Повний текст джерелаMotruk, Johannes. "Characterization of topological phases in models of interacting fermions." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-206990.
Повний текст джерелаLee, Ye-Ryoung. "Ultracold Fermi gas with repulsive interactions." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/79520.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (p. 95-100).
This thesis presents results from experiments of ultracold atomic Fermi gases with repulsive interaction. Itinerant ferromagnetism was studied by simulating the Stoner model with a strongly interacting Fermi gas of ultracold atoms. We observed nonmonotonic behavior of lifetime, kinetic energy, and size for increasing repulsive interactions, which is in good agreement with a mean-field model for the ferromagnetic phase transition. However, later research showed the absence of enhanced spin fluctuation, which is definitive evidence against the ferromagnetic phase transition. Still, our work triggered a lot of research on repulsive interactions in ultracold Fermi gases. A quantitative approach is taken to study ultracold Fermi gases with repulsive interaction. This is done by careful measurements of density profiles in equilibrium. First, Pauli paramagnetism is observed in trapped atomic samples which have an inhomogeneous density due to the harmonic confinement potential. We experimentally measure the susceptibility of ideal Fermi gas. This research shows that ultracold atoms can serve as model systems to demonstrate well-known textbook physics in a more ideal way than other systems. Then, Fermi gases with repulsive interactions are characterized by measuring their compressibility as a function of interaction strength. The compressibility is obtained from in-trap density distributions monitored by phase contrast imaging. For interaction parameters kFa > 0.25 fast decay of the gas prevents the observation of equilibrium profiles. For smaller interaction parameters, the results are adequately described by first-order perturbation theory. A novel phase contrast imaging method compensates for dispersive distortions of the images.
by Ye-Ryoung Lee.
Ph.D.
Bruce, A. M. "Studies of the interacting Boson-Fermion model in the W-Os-Pt nuclei." Thesis, University of Manchester, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375080.
Повний текст джерелаDusuel, Sebastien. "Déformation de la surface de Fermi pour un système fortement anisotrope d'électrons en interaction." Phd thesis, Université Paris-Diderot - Paris VII, 2002. http://tel.archives-ouvertes.fr/tel-00002124.
Повний текст джерелаPotter, Charles D. "Search for evidence of fermi surface nesting in Bi₂Sr₂Ca₁Cu₂O₈." Diss., Virginia Tech, 1992. http://hdl.handle.net/10919/40088.
Повний текст джерелаLevinsen, Jesper F. "Paired fermionic superfluids with s- and p-wave interactions." Connect to online resource, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3284444.
Повний текст джерелаJäckel, Jörg. "Effective actions for strongly interacting fermionic systems." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=968788351.
Повний текст джерелаSchmidt, Ludwig. "Etude sous pression du fermion lourd URu2Si2." Grenoble 1, 1993. http://www.theses.fr/1993GRE10197.
Повний текст джерелаPantel, Pierre-Alexandre. "Étude théorique d’un gaz de fermions froids en interaction : aspects dynamiques et effets de polarisation." Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10167/document.
Повний текст джерелаTechnical progress on ultra-cold Fermi gases experiments induced numerous studies for the last few years. Using these experimental setups, it is effectively possible to generate ultra-cold gases with selected properties, in particular through the Feshbach resonances phenomenon. This allows us to set the sign of the scattering length a using an external magnetic field. It is then possible to have an attractive interaction (a < 0) as well as a repulsive one (a > 0). The Feshbach resonance itself is defined for infinite values of a (positive or negative), which corresponds to a strongly interacting regime. Moreover, when a > 0, molecular bound states (bosonic because they are made with two fermionic atoms) can appear. Thus, below a critical temperature, a superfluid phase can emerge and a crossover can be observed (from the BEC to BCS superfluid states). Depending on the position on the phase diagram, frequency and damping of collective modes will be different. This is why the collective modes are good probes of the system phase. A precise extensive knowledge of their characteristics is thus very important. This thesis presents a complete study of some of these collective modes in the normal phase. This work mainly relies on the Boltzmann equation which will be solved in two different ways: firstly, with an improved (higher order) version of the so-called moments method; secondly with a numerical solution that has required to write a numerical code in order to take into account the in-medium effects (mean field potential and in-medium cross section). Particular attention has been paid to numerical simulations in order to reproduce as closely as possible the experimental conditions. Moreover, experimental procedures now allow to create spin unbalanced gases. We have shown in this work a study of these systems using the numerical resolution of the Boltzmann equation. Moreover, we have developed a theoretical approach in order to build the phase diagram of these polarized gases, which is not fully described yet. Finally, we have suggested a method to determine the in-medium effects, with the aim to solve the problem emerging with the usual method used in the balanced case
Radhi, Fahmi Sha'ban. "Studies of 76Se and 75As by gamma-ray spectroscopy and interacting Boson (-Fermion) models." Thesis, Royal Holloway, University of London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338872.
Повний текст джерелаGoff, Leonard Thomas. "Surface codes, the 2D classical Ising model, and non-interacting fermions." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/36374.
Повний текст джерелаde, Coster George. "Effective Soft-Mode Theory of Strongly Interacting Fermions in Dirac Semimetals." Thesis, University of Oregon, 2019. http://hdl.handle.net/1794/24235.
Повний текст джерела2020-01-11
Günter, Kenneth John. "Interacting Fermi gases and Bose-Fermi mixtures in optical lattices." Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17446.
Повний текст джерелаVAN, DEN BOSSCHE MATHIAS. "Fermions a une dimension : etude du modele a interaction par sauts de paires." Paris 6, 1996. http://www.theses.fr/1996PA066718.
Повний текст джерелаPASCAUD, MICHAEL. "Magnetisme orbital de conducteurs mesoscopiques desordonnes et proprietes spectrales de fermions en interaction." Paris 11, 1998. http://www.theses.fr/1998PA112319.
Повний текст джерелаFräßdorf, Christian [Verfasser]. "Field Theories of Interacting and Disordered Dirac Fermions in Graphene / Christian Fräßdorf." Berlin : Freie Universität Berlin, 2019. http://d-nb.info/1183675682/34.
Повний текст джерелаMoosavi, Per. "Interacting fermions and non-equilibrium properties of one-dimensional many-body systems." Licentiate thesis, KTH, Teoretisk fysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-193330.
Повний текст джерелаQC 20161003
Kim, YÅ ng-baek. "Interaction of composite fermions with a gauge field in the fractional quantum Hall regime." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/32672.
Повний текст джерелаFröhlich, Bernd. "A strongly interacting two-dimensional Fermi gas." Thesis, University of Cambridge, 2011. https://www.repository.cam.ac.uk/handle/1810/252252.
Повний текст джерелаKu, Mark. "Strongly-interacting Fermi gases with population imbalance." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/12629.
Повний текст джерелаBaldwin, James. "Two level systems interacting with Fermi liquids." Thesis, University of Birmingham, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.555318.
Повний текст джерелаStan, Claudiu Andrei. "Experiments with interacting Bose and Fermi gases." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/34384.
Повний текст джерелаIncludes bibliographical references (p. 191-204).
In the past few years, the study of trapped fermionic atoms evolved from the first cooling experiments which produced quantum degenerate samples to becoming one of the most exciting branches of current atomic physics research. This thesis covers experiments done throughout this period, which can be grouped in three sets of studies. First, degenerate 6Li Fermi gases have been produced by sympathetic cooling with bosonic 23Na. For this, an existing 23Na Bose-Einstein condensation apparatus was upgraded to an experiment capable of producing degenerate 6Li Fermi gases and 6Li-23Na degenerate Fermi-Bose mixtures. The cooling methods have been developed in two different stages, resulting in the production of degenerate 6Li Fermi gases with temperatures below 0.05 TF and up to 7 x 107 atoms, and of degenerate 6Li-23Na mixtures with a few million atoms in each of the components. Second, the properties of 6Li-23Na mixtures at different magnetic fields have been investigated, resulting in the discovery of three interspecies 6Li-23Na Feshbach resonances, which opens up the possibility to study strongly interacting Bose-Fermi mixtures in this system. This investigations also led to the observation of other Feshbach resonances in 6Li and 23Na. Third, the properties of strongly interacting 6Li spin mixtures in the strong interacting regime near a Feshbach resonance have been investigated. Weakly bound 6Li2 molecules have been produced and Bose condensed on the repulsive side of the Feshbach resonance. Pure molecular condensates with up to 3 x 106 molecules have been produced.
(cont.) The properties of the interacting Fermi gas were investigated on the attractive side of the resonance using rapid field ramps to the other side of the resonance. Fermion pairing, and condensation of these pairs was observed near the resonance, offering evidence for superfluid behavior in a strongly interacting Fermi gas.
by Claudiu Andrei Stan.
Ph.D.
D'Elia, Claudio. "A two-body study of dynamical expansion in the XXZ spin chain and equivalent interacting fermion models." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7604/.
Повний текст джерелаForsythe, D. "The evolution of Fermi liquid interactions in Sr2RuO4 under pressure." Thesis, University of Cambridge, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.599130.
Повний текст джерелаCosta, Louis. "An interacting Fermi-Fermi mixture at the crossover of a narrow Feshbach resonance." Diss., lmu, 2011. http://nbn-resolving.de/urn:nbn:de:bvb:19-131291.
Повний текст джерелаKleeberg, Katja [Verfasser]. "Dyson-Schwinger Equations for strongly interacting fermions on the hexagonal graphene lattice / Katja Kleeberg." Gießen : Universitätsbibliothek, 2019. http://d-nb.info/1200352521/34.
Повний текст джерелаLang, Gladys Hau-Wan Goddard William A. Koonin Steven E. "Auxiliary-field Monte Carlo methods for interacting fermions application to the nuclear shell model /." Diss., Pasadena, Calif. : California Institute of Technology, 1993. http://resolver.caltech.edu/CaltechTHESIS:10222009-160215418.
Повний текст джерелаAdvisor names found in the Acknowledgments pages of the thesis. Title from home page. Viewed 01/22/2010. Includes bibliographical references.