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Symmetry and Universality in Quantum Many-Body Systems
Symmetry and Universality in Quantum Many-Body Systems
Symmetry and Universality in Quantum Many-Body Systems

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202104659
ISBN  
9798291544303
DDC  
530
저자명  
Myerson-Jain, Nayan.
서명/저자  
Symmetry and Universality in Quantum Many-Body Systems
발행사항  
[Sl] : University of California, Santa Barbara, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
242 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-02, Section: B.
주기사항  
Advisor: Xu, Cenke.
학위논문주기  
Thesis (Ph.D.)--University of California, Santa Barbara, 2025.
초록/해제  
요약This dissertation reports on recent novel results regarding symmetry and quantum critical phenomena in condensed matter and quantum many-body systems. Such systems, composed of many strongly-interacting degrees of freedom, are classified by their long-distance behavior captured by fixed-points of the Renormalization Group (RG) in a Quantum Field Theory (QFT) framework. Additionally, this universal long-distance physics is heavily constrained by generic properties of the system such as symmetries and their potential 't Hooft anomalies. In particular, we focus on two different kinds of such physics in this thesis.This text can be largely divided into two parts. The first part, which includes chapters 2 through 4, discusses statistical and quantum lattice models with "subsystem symmetries". Such symmetries come in two flavors: type-I, where the symmetry charge is supported on a regular submanifold and type-II, where the support of the symmetry charge is fractal instead. We explicitly construct quantum lattice models with type-II (or, fractal) subsystem symmetries composed of qudit or rotor degrees of freedom. These models may support gapped phases that spontaneously break fractal subsystem symmetries. A multicritical point endowed with such symmetry will be remarked upon in Chapter 3 and correlation functions in the ordered phases and at the multicritical point will be also discussed. An experimental proposal for realizing similar models in experimental platforms of Rydberg atoms will also be considered.The second part of this dissertation - contained in chapters 5 through 8 - will instead focus on classifying universal physics in open quantum systems, particularly those coupled to ancilla degrees of freedom without dynamics or a Markovian bath, for finite-time. These effects are realized as decoherence (or weak-measurement) acting on the original system, transforming the quantum wavefunction into a mixed state. The long-distance scaling of entanglement measures and other information-theoretic quantities may see marked change, signifying such mixed-states are examples of new unconventional quantum matter. An array of quantum many-body systems subjected to these effects, including quantum critical points and Chern insulators, will be discussed.
일반주제명  
Physics
일반주제명  
Condensed matter physics
일반주제명  
Quantum physics
일반주제명  
Theoretical physics
키워드  
Critical phenomena
키워드  
Decoherence
키워드  
Phase transitions
키워드  
Quantum Field Theory
키워드  
Quantum information
키워드  
Topology
기타저자  
University of California, Santa Barbara Physics
기본자료저록  
Dissertations Abstracts International. 87-02B.
전자적 위치 및 접속  
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MARC

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■035    ▼a(MiAaPQ)AAI32116053
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530
■1001  ▼aMyerson-Jain,  Nayan.
■24510▼aSymmetry  and  Universality  in  Quantum  Many-Body  Systems
■260    ▼a[Sl]▼bUniversity  of  California,  Santa  Barbara▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a242  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-02,  Section:  B.
■500    ▼aAdvisor:  Xu,  Cenke.
■5021  ▼aThesis  (Ph.D.)--University  of  California,  Santa  Barbara,  2025.
■520    ▼aThis  dissertation  reports  on  recent  novel  results  regarding  symmetry  and  quantum  critical  phenomena  in  condensed  matter  and  quantum  many-body  systems.  Such  systems,  composed  of  many  strongly-interacting  degrees  of  freedom,  are  classified  by  their  long-distance  behavior  captured  by  fixed-points  of  the  Renormalization  Group  (RG)  in  a  Quantum  Field  Theory  (QFT)  framework.  Additionally,  this  universal  long-distance  physics  is  heavily  constrained  by  generic  properties  of  the  system  such  as  symmetries  and  their  potential  't  Hooft  anomalies.  In  particular,  we  focus  on  two  different  kinds  of  such  physics  in  this  thesis.This  text  can  be  largely  divided  into  two  parts.  The  first  part,  which  includes  chapters  2  through  4,  discusses  statistical  and  quantum  lattice  models  with  "subsystem  symmetries".  Such  symmetries  come  in  two  flavors:  type-I,  where  the  symmetry  charge  is  supported  on  a  regular  submanifold  and  type-II,  where  the  support  of  the  symmetry  charge  is  fractal  instead.  We  explicitly  construct  quantum  lattice  models  with  type-II  (or,  fractal)  subsystem  symmetries  composed  of  qudit  or  rotor  degrees  of  freedom.  These  models  may  support  gapped  phases  that  spontaneously  break  fractal  subsystem  symmetries.  A  multicritical  point  endowed  with  such  symmetry  will  be  remarked  upon  in  Chapter  3  and  correlation  functions  in  the  ordered  phases  and  at  the  multicritical  point  will  be  also  discussed.  An  experimental  proposal  for  realizing  similar  models  in  experimental  platforms  of  Rydberg  atoms  will  also  be  considered.The  second  part  of  this  dissertation  -  contained  in  chapters  5  through  8  -  will  instead  focus  on  classifying  universal  physics  in  open  quantum  systems,  particularly  those  coupled  to  ancilla  degrees  of  freedom  without  dynamics  or  a  Markovian  bath,  for  finite-time.  These  effects  are  realized  as  decoherence  (or  weak-measurement)  acting  on  the  original  system,  transforming  the  quantum  wavefunction  into  a  mixed  state.  The  long-distance  scaling  of  entanglement  measures  and  other  information-theoretic  quantities  may  see  marked  change,  signifying  such  mixed-states  are  examples  of  new  unconventional  quantum  matter.  An  array  of  quantum  many-body  systems  subjected  to  these  effects,  including  quantum  critical  points  and  Chern  insulators,  will  be  discussed.
■590    ▼aSchool  code:  0035.
■650  4▼aPhysics
■650  4▼aCondensed  matter  physics
■650  4▼aQuantum  physics
■650  4▼aTheoretical  physics
■653    ▼aCritical  phenomena
■653    ▼aDecoherence
■653    ▼aPhase  transitions
■653    ▼aQuantum  Field  Theory
■653    ▼aQuantum  information
■653    ▼aTopology
■690    ▼a0605
■690    ▼a0611
■690    ▼a0599
■690    ▼a0753
■71020▼aUniversity  of  California,  Santa  Barbara▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g87-02B.
■790    ▼a0035
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358418▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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