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Dissertations / Theses on the topic 'Fermions'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 July 2025

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1

Bullinaria, J. A. "Kaehler fermions." Thesis, University of Southampton, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356054.

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2

Espin, Johnny. "Second-order fermions." Thesis, University of Nottingham, 2015. http://eprints.nottingham.ac.uk/29954/.

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It has been proposed several times in the past that one can obtain an equivalent, but in many aspects simpler description of fermions by first reformulating their first-order (Dirac) Lagrangian in terms of two-component spinors, and then integrating out the spinors of one chirality (e.g.primed or dotted). The resulting new Lagrangian is second-order in derivatives, and contains two-component spinors of only one chirality. The new second-order formulation simplifies the fermion Feynman rules of the theory considerably, e.g. the propagator becomes a multiple of an identity matrix in the field sp
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3

Ebling, Ulrich. "Dynamics of spinor fermions." Doctoral thesis, Universitat Politècnica de Catalunya, 2014. http://hdl.handle.net/10803/284656.

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Ultracold atomic gases have established themselves as quantum systems, which are clean and offer a high degree of control over crucial parameters. They are well isolated from their environment and thus offer the possibility to study coherent many-body dynamics. In this thesis, we address the dynamics of ultracold Fermions with large spin. Fermionic spinor gases differ from the typical situation in condensed matter physics, due to both the presence of the trap and the possibility of having fermions with large (>1/2) spin. Compared to the spin-1/2 case, large spin fermions must have one of two p
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4

Berzi, Alan. "Relativistic Fermions in Graphene." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-20657.

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The Fermi surface of graphene contains points where the connection between excitation energy and crystal momentum is linear, similar to massless or ultrarelativistic fermions. This is important for the physical properties of this material. In this thesis the candidate has combined a study of the theoretical and experimental literature with his own calculations of the excitation spectra of monolayer, bilayer and multilayer graphene.
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5

Laia, João Nuno De Araújo Lopes. "Holography, holonomy and fermions." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610474.

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6

Hands, Simon John. "Lattice theories with fermions." Thesis, University of Edinburgh, 1986. http://hdl.handle.net/1842/14982.

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7

Mou, Zong-Gang. "Fermions in electroweak baryogenesis." Thesis, University of Nottingham, 2015. http://eprints.nottingham.ac.uk/30597/.

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We study the chiral anomaly by solving the Dirac equation for fermions in parallel electric and magnetic fields. In such case, only the lowest-energy Landau levels are relevant to the anomaly. Specifically, for massless fermions, the chiral anomaly is a result of the production of particles of one chirality, and no creation of particles of the other chirality. For massive fermions, we find that the chiral anomaly equation can be simply obtained via a proper regularization of the range of the momentum. We extend the method to anomaly cancellation, and conclude that the conservation of the baryo
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8

Zanotti, James Michael. "Baryon spectroscopy with FLIC fermions." Title page, abstract and table of contents only, 2002. http://web4.library.adelaide.edu.au/theses/09PH/09phz33.pdf.

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"October 2002" Bibliography: p. 129-136. 1. Introduction -- 2. QCD and the standard model -- 3. The Lattice -- 4. Symanzik improvement in the Static Quark Potential -- 5. Scale determination for an improved Gluon Action -- 6. Fat-link Irrelevant Clover Fermion actions -- 7. Excited Baryons in Lattice QCD -- 8. Spin 3/2 Baryons -- 9. Conclusion. This thesis reports work done in conducting numerical simulations of Lattice QCD.
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9

Han, Li. "Spin-orbit coupled ultracold fermions." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/52314.

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In this Thesis we discussed ultracold Fermi gas with an s-wave interaction and synthetic spin-orbit coupling under a variety of conditions. We considered the system in both three and two spatial dimensions, with equal-Rashba-Dresselhaus type or Rashba-only type of spin-orbit-coupling, and with or without an artificial Zeeman field. We found competing effects on Fermionic superfluidity from spin-orbit coupling and Zeeman fields, and topologically non-trivial states in the presence of both fields. We gave an outlook on the many-body physics in the last.
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10

Schofield, Andrew John. "Flux phases for correlated fermions." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282101.

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11

Goodbody, Susan Joan. "Heavy fermions and magnetic order." Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47451.

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12

Allais, Andrea. "Interacting fermions : a holographic approach/." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/83828.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2013.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (page 59).<br>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 bec
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13

MOREIRA, Ivânderson Oliveira. "Sobre Defeitos, Twistons e Fermions." Universidade Federal de Campina Grande, 2018. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1576.

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Submitted by Maria Medeiros (maria.dilva1@ufcg.edu.br) on 2018-08-29T13:13:33Z No. of bitstreams: 1 IVÂNDERSON OLIVEIRA MOREIRA - DISSERTAÇÃO (PPGF) 2018.pdf: 5107079 bytes, checksum: 1e0912f4ced4ad6d7239469d05856b77 (MD5)<br>Made available in DSpace on 2018-08-29T13:13:33Z (GMT). No. of bitstreams: 1 IVÂNDERSON OLIVEIRA MOREIRA - DISSERTAÇÃO (PPGF) 2018.pdf: 5107079 bytes, checksum: 1e0912f4ced4ad6d7239469d05856b77 (MD5) Previous issue date: 2018-07-26<br>Capes<br>Defeitos topológicos são soluções de equações diferenciais que conectam configurações distintas de um sistema. Para modelos unid
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14

Bouadim, Karim. "Phases métalliques de fermions corrélés." Nice, 2008. http://www.theses.fr/2008NICE4079.

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Cette thèse traite des fermions fortement corrélés. En particulier, nous étudions la possibilité d’observer des transitions de phase quantiques de l’état isolant vers l’état métallique ou vers la phase supraconductrice dans des systèmes de fermions en interaction sur réseaux. Dans un premier chapitre, nous allons introduire le modèle de Hubbard qui permet de décrire le comportement des électrons dans des solides cristallins dans la limite des liaisons fortes. Nous prouverons dans un second chapitre la possibilité d’obtenir des transitions de phase isolant-métal gouvernées par les interactions
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15

Cheikine, Ilia. "Fermions lourds et conditions extrêmes." Université Joseph Fourier (Grenoble), 2000. http://www.theses.fr/2000GRE10103.

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Nous avons etudie trois systemes a electrons lourds, cecu 2si 2, cepd 2si 2 et uge 2, par des mesures de transport, d'oscillations quantiques (cepd 2si 2) et de diffraction neutronique (uge 2). Les experiences ont ete effectuees dans des conditions extremes : tres basse temperature, champ magnetique eleve et pression hydrostatique. Pour cecu 2si 2, nous avons suivi l'evolution de la phase a magnetique qui s'effondre rapidement sous pression. Nous avons mis en evidence une relation entre la phase a et la presence d'un maximum dans la dependance en temperature de h c 2. Notre analyse a montre qu
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16

Chiarappa, Thomas. "Chiral fermions on the lattice." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2004. http://dx.doi.org/10.18452/15171.

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Das Ziel dieser Doktorarbeit ist die Berechnung, aus ersten Prinzipien, von Niedrigenenergiekonstanten (NEK), welche die chirale Störungsheorie (ChST) parametrisieren, durch Simulationen auf dem Gitter. Diese Arbeit ist eine Pilotstudie und will deshalb nicht zu definitiven und präzisen quantitativen Vorhersagen führen, sondern wir möchten qualitative Leitlinien für zukünftige genauere Erforschungen der epsilon-Entwicklung der ChST geben. Letztere ist ein Gebiet in dem die chirale Symmetrie wiederhergestellt ist und wo die Compton-Wellenlänge der leichtesten Mesonen grösser als die lineare Dim
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17

Herviou, Loïc. "Topological Phases and Majorana Fermions." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLX036/document.

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Dans cette thèse, nous étudions d'un point de vue théorique différents aspects de la matière topologique. Ces systèmes présentent des propriétés résistantes aux éventuelles perturbations grâce à une topologie non-triviale de leur structure de bandes. En particulier, des excitations exotiques, par exemple des fermions de Majorana, peuvent apparaitre à leurs bords.L'entropie d'intrication, ainsi que le spectre d'intrication ont été fondamentaux dans l'étude théorique de ces systèmes, et plus généralement des phases libres. Il est cependant difficile de les mesurer expérimentalement. L'étude des
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18

Fael, Matteo. "Electromagnetic dipole moments of fermions." Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3423672.

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The electric (EDM) and magnetic (g-2) dipole moments are static properties sensitive to quantum corrections induced by the virtual particles that populate the vacuum. Indeed, they are well suited to test the Standard Model of Elementary of particle physics and to unveil unknown New Physics (NP) hidden at high energy. The electron and muon g-2 have been measured with the wonderful precision of 0.24 ppb and 0.54 ppm, respectively, and thus they represent one of the strongest confirmation of the SM and greatest achievement in Quantum Field Theory. Nonetheless the SM deficiencies, the explana
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19

Bredenstein, Axel. "Precision calculations for gamma gamma -> 4 fermions and H -> WW/ZZ -> 4 fermions." Diss., lmu, 2006. http://nbn-resolving.de/urn:nbn:de:bvb:19-52794.

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20

Nascimbène, Sylvain. "Thermodynamique des gaz de fermions ultrafroids." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2010. http://tel.archives-ouvertes.fr/tel-00491711.

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Les gaz ultrafroids permettent d'étudier sous un angle nouveau des hamiltoniens complexes issus de la matière condensée, tels le modèle de Fermi-Hubbard. Cette thèse présente une nouvelle méthode de mesure de l'équation d'état d'un gaz ultrafroid, autorisant une comparaison directe avec la théorie. Elle repose sur une mesure de la pression à l'intérieur d'un gaz à partir de son image in situ. Nous appliquons cette méthode à l'étude d'un gaz de fermions en interaction résonnante, un gaz de 7Li en interaction faible servant de thermomètre. De manière surprenante, aucune des théories à N corps du
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21

Omid, Hamid. "Holographic fermions in d=2+1." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/36797.

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Recently, a large amount of effort has gone towards using the AdS/CFT conjecture in condensed matter physics. First, we present a review of the conjecture, then we use the conjecture to model 2+1-dimensional fermions. We find three kinds of solutions with different kinds of discrete symmetries. We show that Chern-Simons- like electric responses, computed using a holographic model appear with the right quantized coefficients.
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22

De, Lia Anthony Frances. "Functional-integral studies of correlated fermions." Honors in the Major Thesis, University of Central Florida, 1993. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/113.

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This item is only available in print in the UCF Libraries. If this is your Honors Thesis, you can help us make it available online for use by researchers around the world by following the instructions on the distribution consent form at http://library.ucf.edu/Systems/DigitalInitiatives/DigitalCollections/InternetDistributionConsentAgreementForm.pdf You may also contact the project coordinator, Kerri Bottorff, at kerri.bottorff@ucf.edu for more information.<br>Bachelors<br>Arts and Sciences<br>Physics
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23

Hofmann, Johannes Benedict. "Exact relations for strongly interacting fermions." Thesis, University of Cambridge, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648470.

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24

Disertori, Margherita. "Renormalisation constructive des fermions en interaction." Palaiseau, Ecole polytechnique, 1999. http://www.theses.fr/1999EPXX0038.

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En utilisant la technique de la renormalisation constructive, nous avons developpe une technique rigoureuse pour la renormalisation des systemes fermioniques. Apres l'avoir testee sur un probleme deja bien connu (la limite ultraviolette du modele de gross-neveu massif a deux dimensions) nous l'avons etendue a la physique du solide. Dans ce contexte nous avons considere un modele simple decrivant la phase normale d'un supraconducteur en deux dimensions spatiales. En particulier nous avons donne la premiere preuve rigoureuse d'une relation, entre la constante de couplage et la temperature critiq
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25

Ambrus, Victor E. "Dirac fermions on rotating space-times." Thesis, University of Sheffield, 2014. http://etheses.whiterose.ac.uk/7527/.

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Quantum states of Dirac fermions at zero or finite temperature are investigated using the point-splitting method in Minkowski and anti-de Sitter space-times undergoing rotation about a fixed axis. In the Minkowski case, analytic expressions presented for the thermal expectation values (t.e.v.s) of the fermion condensate, parity violating neutrino current and stress-energy tensor show that thermal states diverge as the speed of light surface (SOL) is approached. The divergence is cured by enclosing the rotating system inside a cylinder located on or inside the SOL, on which spectral and MIT bag
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26

Hoffmann, Roland. "Chiral properties of dynamical Wilson fermions." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2005. http://dx.doi.org/10.18452/15341.

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Quantenchromodynamik mit zwei leichten Quarks wird in der Gitterregularisierung mit verbesserten Wilson Fermionen betrachtet. Die chirale Symmetrie in dieser Formulierung wird von Gitterartefakten, die linear im Gitterabstand a sind, explizit gebrochen. Daher erfordern die axialen Isospin Ströme Verbesserung (im Symanzik Sinn), sowie eine endliche Renormierung, wenn sie die Ward--Takahashi Identitäten des Kontinuums bis auf kleine Gitterkorrekturen proportional zu a^2 erfüllen sollen. Algorithmische Probleme bei großen Gitterabständen machen die numerischen Simulationen der Gitterth
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27

Kershaw, Tristan. "Millikelvin magnetisation studies of low dimensional systems." Thesis, University of Exeter, 2008. http://hdl.handle.net/10036/41133.

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This thesis presents a study of two-dimensional electron systems in GaAs-(Al,Ga)As heterojunctions and quasi-two-dimensional electron and hole systems in graphite within the quantum Hall effect regime of low temperature and high magnetic field. This thesis covers three main sets of experimental work as well as details of the experimental methods (chapter 2) used and the background theory behind the observed results (chapter 1). The first experimental results presented in this thesis in chapter 3 focus on contactless measurement of the equilibrium magnetisation of sample A2268, a ten layer mult
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28

Hlubina, Richard. "Properties of fermions coupled to gauge fields /." [S.l.] : [s.n.], 1993. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=10227.

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29

Corboz, Philippe Roger. "Simulations of strongly correlated fermions and bosons /." Zürich : ETH, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17994.

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30

Tarruell, Leticia. "Superfluidité dans un gaz de fermions ultrafroids." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2008. http://tel.archives-ouvertes.fr/tel-00429181.

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Ce mémoire de thèse est divisé en deux parties. La première est consacrée à l'étude de la superfluidité dans un gaz de fermions ultra-froids. En utilisant un gaz dégénéré de lithium 6 au voisinage d'une résonance de Feshbach nous avons obtenu un superfluide fermionique et étudié son évolution en fonction de l'énergie de liaison des paires. Afin de caractériser la transition BEC-BCS entre un condensat de Bose-Einstein de molécules et un état BCS de paires de Cooper faiblement liées, nous avons étudié l'expansion du nuage en absence ou en présence d'interactions. Nous avons ainsi extrait la dist
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31

Akyar, Ozge. "Density Functional Theory For Trapped Ultracold Fermions." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610948/index.pdf.

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Recently a new outlook on dealing with dipolar ultracold fermions based on density functional methods has received attention. A Thomas-Fermi treatment coupled with a variational approach has been developed for a collection of fermions trapped in a harmonic potential interacting via dipole-dipole forces. In this thesis, firstly our alternative formalism for Thomas-Fermi method by performing some calculations based on the Kohn-Sham formalism which is one of the main idea of density functional theory is investigated. Furthermore, density distributions are obtained dependent to the parameters<br>r
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32

Lucena, Gomez Gustavo. "Aspects of higher-spin theory with fermions." Doctoral thesis, Universite Libre de Bruxelles, 2014. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209320.

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The present thesis is divided into three parts. In Part I we address a problem within Higher-Spin Gauge Theory in dimension three: namely, that of computing the asymptotic symmetry algebra of supersymmetric models, describing an infinite spectrum of integer and half-integer higher-spin fields. In Part II we investigate higher-spin theories in dimension four or greater, where we classify the consistent cross interactions between free gauge fermions of arbitrary spin and a photon or a graviton. A third part supplements the bulk of the manuscript with technical appendices. <p><p>Part I is concern
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33

Wulff, Linus. "Strings, boundary fermions and coincident D-branes." Doctoral thesis, Stockholm : Department of Physics, Stockholm University, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-6576.

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34

Hierl, Dieter. "Lattice Quantum ChromoDynamics with approximately chiral fermions." kostenfrei, 2008. http://www.opus-bayern.de/uni-regensburg/volltexte/2008/1020/.

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35

Hsu, Siu-fai, and 許紹輝. "Geometric quantization of fermions and complex bosons." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hub.hku.hk/bib/B50434500.

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Geometric quantization is a subject of finding irreducible representations of certain group or algebra and identifying those equivalent representations by geometric means. Geometric quantization of even dimensional fermionic system has been constructed based on the spinor representation of even dimensional Clifford algebras. Although geometric quantization of odd dimensional fermionic system has not been done, the existence of spinor representations in odd dimension indicates that the geometric quantization is possible. In quantum field theory, charge conjungation can be defined on complex
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36

Petrat, Sören. "Derivation of mean-field dynamics for fermions." Diss., Ludwig-Maximilians-Universität München, 2014. http://nbn-resolving.de/urn:nbn:de:bvb:19-169869.

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In this work, we derive the time-dependent Hartree(-Fock) equations as an effective dynamics for fermionic many-particle systems. Our main results are the first for a quantum mechanical mean-field dynamics for fermions; in previous works, the mean-field limit is usually either coupled to a semiclassical limit, or the interaction is scaled down so much, that the system behaves freely for large particle number N. We mainly consider systems with total kinetic energy bounded by const N and long-range interaction potentials, e.g., Coulomb interaction. Examples for such systems are large molecules o
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37

Cheuk, Lawrence W. "Quantum gas microscopy of strongly correlated fermions." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/112078.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 2017.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 239-251).<br>This thesis describes experiments on ultracold fermionic atoms, and can be divided into two areas. The first concerns spin-orbit coupling; the second concerns quantum gas microscopy. With the use of Raman transitions, ID spin-orbit coupling of ultracold 6Li was realized. Using a novel type of spectroscopy, spin-injection spectroscopy, where the spin, energy, and momentum are all resolved, we directly observed the
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38

Chin, Jit Kee. "Strongly-interacting fermions in an optical lattice." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/45417.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2007.<br>Includes bibliographical references (p. 131-138).<br>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 swit
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39

Jolicoeur, Thierry. "Theories de jauge sur reseau avec fermions." Paris 6, 1987. http://www.theses.fr/1987PA066012.

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Etude de divers aspects des theories de jauge sur reseau. Etude de l'ecriture des champs de fermions due a kogut et susskind. Cette formulation reproduit une partie de la symetrie chirale de la theorie continue. Presentation des resultats relatifs aux effets de taille finie agissant sur le parametre d'ordre de cette symetrie et le mode de goldstone associe. Examen de la limite continue d'une modele de theorie des champs bidimensionnelle en interactions dit de gross-neveu. Ceci permet d'etablir que la discretisation de kogut-susskind a le bon comportement necessaire pour reproduire une theorie
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40

Tarruell, Letitia. "Superfluidité dans un gaz de fermions ultrafroids." Paris 6, 2008. http://www.theses.fr/2008PA066671.

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Ce mémoire de thèse est divisé en deux parties. La première est consacrée à l’étude de la superfluidité dans un gaz de fermions ultra-froids. En utilisant un gaz dégénéré de 6Li au voisinage d’une résonance de Feshbach nous avons obtenu un superfluide fermionique et étudié son évolution en fonction de l’énergie de liaison des paires. Afin de caractériser la transition BEC-BCS entre un condensat de Bose-Einstein de molécules et un état BCS de paires de Cooper faiblement liées, nous avons étudié l’expansion du nuage en absence ou en présence d’interactions. Nous avons ainsi extrait la distributi
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41

Frenzel, Alex J. "Terahertz Electrodynamics of Dirac Fermions in Graphene." Thesis, Harvard University, 2015. http://nrs.harvard.edu/urn-3:HUL.InstRepos:17467397.

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Charge carriers in graphene mimic two-dimensional massless Dirac fermions with linear energy dispersion, resulting in unique optical and electronic properties. They exhibit high mobility and strong interaction with electromagnetic radiation over a broad frequency range. Interband transitions in graphene give rise to pronounced optical absorption in the mid-infrared to visible spectral range, where the optical conductivity is close to a universal value $\sigma_0 = \pi e^2/2h$. Free-carrier intraband transitions, on the other hand, cause low-frequency absorption, which varies significantly with
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42

Jolicoeur, Thierry. "Théories de Jauge sur réseau et fermions." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37606255n.

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43

Casiano-Diaz, Emanuel. "Quantum entanglement of one-dimensional spinless fermions." ScholarWorks @ UVM, 2019. https://scholarworks.uvm.edu/graddis/1052.

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The constituents of a quantum many-body system can be inextricably linked, a phenomenon known as quantum entanglement. Entanglement can be used as a resource for quantum computing, quantum communication and detecting phase transitions, among others. The amount of entanglement can be quantified via the von Neumann and Rényi entropies, which have their origins in information theory. In this work, the quantum entanglement between subsystems of a one dimen- sional lattice model of fermions is quantified. The von Neumann and Rényi entropies were calculated for two types of subsystems. In the first
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44

Del, Re Lorenzo. "Multicomponent strongly correlated fermions in optical lattices." Doctoral thesis, SISSA, 2016. http://hdl.handle.net/20.500.11767/4907.

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The present thesis is devoted to the study of physical phenomena emerging from strong correlations in strongly interacting quantum many-body systems with several components. Hubbard models are widely used as minimal models which take into account the interactions between particles and they have been studied in relation to phenomena such as Mott localization, unconventional superconductivity, quantum magnetism and many others. All of these striking phenomena share their origin from the strong correlations among fermions induced by their mutual interactions. Furthermore, condensed matter
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45

Drach, Vincent. "Fermions twistés dynamiques et spectroscopie des baryons." Phd thesis, Grenoble, 2010. http://www.theses.fr/2010GRENY015.

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Ce travail s'intéresse au calcul de la masse des baryons à partir de la théorie décrivant l'interaction forte : la chromodynamique quantique (QCD). Cette théorie régit l'interaction entre les quarks et l es gluons et a pu durant ces dernières décennies être vérifiée à haute énergie grâce à l'une de ses propriétés : la liberté asymptoti que. Celle-ci prédit que les calculs perturbatifs sont valides à haute énergie car la constante de couplage tend vers zéro. Les quantités physiques régissant la physique à basse énergie nécessitent quant à elles un traitement non pertubatif et font l'objet de ce
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46

Drach, Vincent. "Fermions twistés dynamiques et spectroscopie des baryons." Phd thesis, Université de Grenoble, 2010. http://tel.archives-ouvertes.fr/tel-00633497.

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Ce travail s'intéresse au calcul de la masse des baryons à partir de la théorie décrivant l'interaction forte : la chromodynamique quantique (QCD). Cette théorie régit l'interaction entre les quarks et l es gluons et a pu durant ces dernières décennies être vérifiée à haute énergie grâce à l'une de ses propriétés : la liberté asymptoti que. Celle-ci prédit que les calculs perturbatifs sont valides à haute énergie car la constante de couplage tend vers zéro. Les quantités physiques régissant la physique à basse énergie nécessitent quant à elles un traitement non pertubatif et font l'objet de ce
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47

Zhao, Yuxin, and 趙宇心. "Topological theory of gapless and gapped fermionic systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/206330.

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Recently the discoveries of graphene, Weyl semi-metal and Dirac semi-metal are drawing more and more people’s attentions back to the topological characteristics of Fermi surfaces, which may be tracked back to the pair of Weyl points observed experimentally in the phase A of Helium three in 80s in the last century. Based on the pioneer works by Volovik and Hořava, we classify all kinds of Fermi surfaces with respect to anti-unitary symmetries and codimensions of Fermi surfaces. The first chapter of this thesis is attributed to develop symmetry-dependent topological invariants to characterize to
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Reyes, Castillo Daniel Fernando [UNESP]. "Evaluation of the partition function of fermions using Grassmann coherent states without parth integrals." Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/132675.

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Made available in DSpace on 2016-01-13T13:27:35Z (GMT). No. of bitstreams: 0 Previous issue date: 2009. Added 1 bitstream(s) on 2016-01-13T13:33:03Z : No. of bitstreams: 1 000854793.pdf: 1774042 bytes, checksum: 57b7a4a1a27003e8145b97f22c7001fa (MD5)
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Mélin, Régis. "Systèmes de fermions fortement corrélésDynamique de systèmes vitreux." Université Joseph Fourier (Grenoble), 1995. http://www.theses.fr/1995GRE10096.

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Borejsza, Karol. "Etude du modèle de Hubbard bidimensionnel dans l'approche du modèle sigma non linéaire effectif." Paris 11, 2004. http://www.theses.fr/2004PA112288.

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Nous etudions les fluctuations magnetiques et les proprietes a une particule (1p) du modele de hubbard a 2d, en decrivant les fluctuations de spin par un modele sigma non lineaire (msnl) effectif. Notre theorie suppose l'existence d'un ordre antiferromagnetique (af) a courte portee. Elle est valable pour toute valeur de l'interaction coulombienne u, en dessous d'une temperature de cross-over, ou s'etablit l'ordre af local. Au demi-remplissage, nous traÇons le diagramme de phases magnetique nous montrons qu'a temperature nulle (t=0) l'ordre af existe quelle que soit la valeur de u. Le fondament
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