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Author: MARC.. BOCQUET
Publisher:
ISBN:
Category :
Languages : fr
Pages : 214
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Book Description
LA PREMIERE PARTIE DE CETTE THESE TRAITE DES CHAINES DE SPINS QUANTIQUES. ON ETUDIE TOUT D'ABORD DES SYSTEMES DE SPINS QUANTIQUES QUI SONT RELIES DE FACON CONTINUE A LA CHAINE DE HEISENBERG S = 1. LA CONSTRUCTION D'UN MODELE SIGMA NON-LINEAIRE PERMET D'ESTIMER LE GAP DE CES SYSTEMES. ON ETUDIE ENSUITE UNE CHAINE DE SPINS S = 1/2 DOPEE PAR DES IMPURETES NON-MAGNETIQUES POSSEDANT UN SPIN NUCLEAIRE. A L'AIDE DE TECHNIQUES DE BOSONISATION, ON CALCULE ANALYTIQUEMENT LE TEMPS DE RELAXATION LONGITUDINAL D'UNE IMPURETE EN FONCTION DE LA TEMPERATURE, CORRECTIONS LOGARITHMIQUES INCLUSES. CE TYPE D'ANALYSE EST EGALEMENT MENE SUR UN LIQUIDE DE LUTTINGER CHIRAL, MODELISANT PAR EXEMPLE UN DEMI-FIL QUANTIQUE. LA DEUXIEME PARTIE EST CONSACREE AUX SYSTEMES DESORDONNES EN BASSE DIMENSION. DES LIENS FORMELS SONT ECLAIRCIS ENTRE MODELE DESORDONNE SUR RESEAU, FERMIONS DE DIRAC EN MILIEU ALEATOIRE, CHAINES DE SPINS SUPERSYMETRIQUES NON-COMPACTES ET MODELE SIGMA NON-LINEAIRE. LE DETAIL DES CALCULS EST DONNE SUR L'EXEMPLE DE LA TRANSITION ENTRE PLATEAUX DE L'EFFET HALL QUANTIQUE ENTIER. ON CALCULE ENSUITE EXACTEMENT LES DENSITES D'ETATS ET LES LONGUEURS DE LOCALISATION TYPIQUES D'UN FERMION DE DIRAC EN DIMENSION 1 DANS DES POTENTIELS ALEATOIRES DE DIFFERENTES NATURES. DE NOMBREUX MODELES DE THEORIE DE LA MATIERE CONDENSEE, COMME PAR EXEMPLE LA CHAINE XX DESORDONNEE, SE RAMENENT A CE SYSTEME. PUIS NOUS ETUDIONS LES FERMIONS DE DIRAC EN DIMENSION 2 EN MILIEU ALEATOIRE. PLUS PARTICULIEREMENT, NOUS ANALYSONS LE CAS DE FERMIONS EN MASSE ALEATOIRE. CE MODELE DECRIT LES EXCITATIONS DE BASSE ENERGIE D'UN SUPRACONDUCTEUR D'ONDE D DONT LES IMPURETES SONT MAGNETIQUES. UN DIAGRAMME DE PHASE EST PROPOSE. IL S'ARTICULE AUTOUR DU POINT TRICRITIQUE DES FERMIONS DE DIRAC LIBRES ET FAIT APPARAITRE UNE PHASE METALLIQUE THERMIQUE INATTENDUE.
Author: MARC.. BOCQUET
Publisher:
ISBN:
Category :
Languages : fr
Pages : 214
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Book Description
LA PREMIERE PARTIE DE CETTE THESE TRAITE DES CHAINES DE SPINS QUANTIQUES. ON ETUDIE TOUT D'ABORD DES SYSTEMES DE SPINS QUANTIQUES QUI SONT RELIES DE FACON CONTINUE A LA CHAINE DE HEISENBERG S = 1. LA CONSTRUCTION D'UN MODELE SIGMA NON-LINEAIRE PERMET D'ESTIMER LE GAP DE CES SYSTEMES. ON ETUDIE ENSUITE UNE CHAINE DE SPINS S = 1/2 DOPEE PAR DES IMPURETES NON-MAGNETIQUES POSSEDANT UN SPIN NUCLEAIRE. A L'AIDE DE TECHNIQUES DE BOSONISATION, ON CALCULE ANALYTIQUEMENT LE TEMPS DE RELAXATION LONGITUDINAL D'UNE IMPURETE EN FONCTION DE LA TEMPERATURE, CORRECTIONS LOGARITHMIQUES INCLUSES. CE TYPE D'ANALYSE EST EGALEMENT MENE SUR UN LIQUIDE DE LUTTINGER CHIRAL, MODELISANT PAR EXEMPLE UN DEMI-FIL QUANTIQUE. LA DEUXIEME PARTIE EST CONSACREE AUX SYSTEMES DESORDONNES EN BASSE DIMENSION. DES LIENS FORMELS SONT ECLAIRCIS ENTRE MODELE DESORDONNE SUR RESEAU, FERMIONS DE DIRAC EN MILIEU ALEATOIRE, CHAINES DE SPINS SUPERSYMETRIQUES NON-COMPACTES ET MODELE SIGMA NON-LINEAIRE. LE DETAIL DES CALCULS EST DONNE SUR L'EXEMPLE DE LA TRANSITION ENTRE PLATEAUX DE L'EFFET HALL QUANTIQUE ENTIER. ON CALCULE ENSUITE EXACTEMENT LES DENSITES D'ETATS ET LES LONGUEURS DE LOCALISATION TYPIQUES D'UN FERMION DE DIRAC EN DIMENSION 1 DANS DES POTENTIELS ALEATOIRES DE DIFFERENTES NATURES. DE NOMBREUX MODELES DE THEORIE DE LA MATIERE CONDENSEE, COMME PAR EXEMPLE LA CHAINE XX DESORDONNEE, SE RAMENENT A CE SYSTEME. PUIS NOUS ETUDIONS LES FERMIONS DE DIRAC EN DIMENSION 2 EN MILIEU ALEATOIRE. PLUS PARTICULIEREMENT, NOUS ANALYSONS LE CAS DE FERMIONS EN MASSE ALEATOIRE. CE MODELE DECRIT LES EXCITATIONS DE BASSE ENERGIE D'UN SUPRACONDUCTEUR D'ONDE D DONT LES IMPURETES SONT MAGNETIQUES. UN DIAGRAMME DE PHASE EST PROPOSE. IL S'ARTICULE AUTOUR DU POINT TRICRITIQUE DES FERMIONS DE DIRAC LIBRES ET FAIT APPARAITRE UNE PHASE METALLIQUE THERMIQUE INATTENDUE.
Author:
Publisher:
ISBN:
Category : Mathematical physics
Languages : en
Pages : 548
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Author: G. Rickayzen
Publisher: Courier Corporation
ISBN: 048631586X
Category : Science
Languages : en
Pages : 370
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Book Description
Presentation of the basic theoretical formulation of Green's functions, followed by specific applications: transport coefficients of a metal, Coulomb gas, Fermi liquids, electrons and phonons, superconductivity, superfluidity, and magnetism. 1984 edition.
Author: Domenico Delli Gatti
Publisher: Springer Science & Business Media
ISBN: 9783540669791
Category : Business & Economics
Languages : en
Pages : 312
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Book Description
This book is a collection of essays which examine how the properties of aggregate variables are influenced by the actions and interactions of heterogenous individuals in different economic contexts. The common denominator of the essays is a critique of the representative agent hypothesis. If this hypothesis were correct, the behaviour of the aggregate variable would simply be the reproduction of individual optimising behaviour. In the methodology of the hard sciences, one of the achievements of the quantum revolution has been the rebuttal of the notion that aggregate behaviour can be explained on the basis of the behaviour of a single unit: the elementary particle does not even exist as a single entity but as a network, a system of interacting units. In this book, new tracks in economics which parallel the developments in physics mentioned above are explored. The essays, in fact are contributions to the analysis of the economy as a complex evolving system of interacting agents.
Author: Dionys Baeriswyl
Publisher: Springer Science & Business Media
ISBN: 1489910425
Category : Science
Languages : en
Pages : 408
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Book Description
In the slightly more than thirty years since its formulation, the Hubbard model has become a central component of modern many-body physics. It provides a paradigm for strongly correlated, interacting electronic systems and offers insights not only into the general underlying mathematical structure of many-body systems but also into the experimental behavior of many novel electronic materials. In condensed matter physics, the Hubbard model represents the simplest theoret ical framework for describing interacting electrons in a crystal lattice. Containing only two explicit parameters - the ratio ("Ujt") between the Coulomb repulsion and the kinetic energy of the electrons, and the filling (p) of the available electronic band - and one implicit parameter - the structure of the underlying lattice - it appears nonetheless capable of capturing behavior ranging from metallic to insulating and from magnetism to superconductivity. Introduced originally as a model of magnetism of transition met als, the Hubbard model has seen a spectacular recent renaissance in connection with possible applications to high-Tc superconductivity, for which particular emphasis has been placed on the phase diagram of the two-dimensional variant of the model. In mathematical physics, the Hubbard model has also had an essential role. The solution by Lieb and Wu of the one-dimensional Hubbard model by Bethe Ansatz provided the stimulus for a broad and continuing effort to study "solvable" many-body models. In higher dimensions, there have been important but isolated exact results (e. g. , N agoaka's Theorem).
Author: David Sayre
Publisher: Oxford [Oxfordshire] : Clarendon Press
ISBN:
Category : Computers
Languages : en
Pages : 590
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Book Description
Papers presented at the International Summer School on Crystallography Computing, Carleton University, Ottawa, August 7-15, 1981.
Author: Pierre-Gilles de Gennes
Publisher:
ISBN: 9787519283667
Category : Superconductivity
Languages : zh-CN
Pages : 0
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Book Description
Author: Pierre Gilles de Gennes
Publisher: Cambridge University Press
ISBN: 0521564174
Category : Science
Languages : en
Pages : 129
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Book Description
An impressionistic tour of the physics of soft interfaces by Nobel Laureate Pierre Gilles de Gennes.
Author: Pierre-Gilles de Gennes
Publisher: Springer Science & Business Media
ISBN: 1461224101
Category : Science
Languages : en
Pages : 197
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Book Description
Written by 1991 Nobel laureate Pierre Gilles de Gennes, this fascinating book addresses topics ranging from soft-matter physics to the activities of science: the role of individual or team work, the relation of discovery to correction, and the interplay of conscience and knowledge. "Reading this book can be compared to strolling through a magnificent garden of fragile objects...I highly recommend it to any reader who is interested in condensed matter physics and science at large."-PHYSICS TODAY
Author: Richard Phillips Feynman
Publisher: W. W. Norton
ISBN: 9780393061321
Category : Biography & Autobiography
Languages : en
Pages : 511
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Book Description
An omnibus edition of classic adventure tales by the Nobel Prize-winning physicist includes his exchanges with Einstein and Bohr, ideas about gambling with Nick the Greek, and solution to the Challenger disaster, in a volume complemented by an hour-long audio CD of his 1978 "Los Alamos from Below" lecture. 30,000 first printing.
