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Dynamics and Universality of Many-Body Open Quantum Systems
Dynamics and Universality of Many-Body Open Quantum Systems
Dynamics and Universality of Many-Body Open Quantum Systems

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20260202105253
ISBN  
9798265451262
DDC  
530
저자명  
Kulkarni, Anish.
서명/저자  
Dynamics and Universality of Many-Body Open Quantum Systems
발행사항  
[Sl] : Princeton University, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
208 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
주기사항  
Advisor: Ryu, Shinsei.
학위논문주기  
Thesis (Ph.D.)--Princeton University, 2025.
초록/해제  
요약A quantum system is rarely isolated from its environment; in other words, it is open. It exchanges energy, particles, and other charges with its environment. Such dissipative processes fundamentally alter its dynamics. In mathematical terms, the time evolution becomes non-Unitary and can no longer be described by a Hermitian Hamiltonian. Thus, open systems exhibit new phenomena that do not occur in closed quantum systems. In this work, we study emergent phenomena in open many-body quantum systems. As prototypical examples of strongly interacting dissipative quantum matter, we analyze Lindbladian versions of the Sachdev-Ye-Kitaev (SYK) model. The steady-state Green's functions of these models display an overdamped to underdamped transition as dissipation strength is reduced. Reducing it further, we observe that the steady-state relaxation rate remains non-zero even as the dissipation strength vanishes. This is called anomalous dissipation and has since been established as a generic feature of many-body Lindbladians. To characterize far-from-equilibrium dynamics of these models we calculate the average Loschmidt echo starting from a random initial state. We find that the system undergoes dynamical phase transitions signalled by non-analytic behavior of the Loschmidt as a function of time. Using this data, we construct dynamical phase diagrams of these models which feature first- and second-order transitions as well as a dynamical crossover. After studying these collective phenomena at large system size, we analyze the symmetry properties of these models at finite system size. We build a periodic table of the SYK Lindbladians based on internal symmetry and the associated 38-fold classification scheme for non-Hermitian matrices. More generally, we construct all relevant internal symmetry operators for generic fermionic Lindbladians. Previously, it was conjectured based on numerical evidence that a particular internal symmetry, namely Time Reversal Symmetry†  (TRS†), gives rise to two new universality classes for non-Hermitian quantum chaos. In our work we analytically calculate exact expressions for statistical properties of random matrices in these conjectured universality classes. Our results corroborate the universality conjecture and lay the foundation to rigorously quantify universal correlations in chaotic open quantum systems.
일반주제명  
Condensed matter physics
일반주제명  
Statistical physics
일반주제명  
Theoretical physics
일반주제명  
Physics
일반주제명  
Quantum physics
키워드  
Non-hermitian physics
키워드  
Open quantum systems
키워드  
Random matrix theory
키워드  
Sachdev-Ye-Kitaev model
기타저자  
Princeton University Physics
기본자료저록  
Dissertations Abstracts International. 87-06B.
전자적 위치 및 접속  
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MARC

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■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530
■1001  ▼aKulkarni,  Anish.
■24510▼aDynamics  and  Universality  of  Many-Body  Open  Quantum  Systems
■260    ▼a[Sl]▼bPrinceton  University▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a208  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-06,  Section:  B.
■500    ▼aAdvisor:  Ryu,  Shinsei.
■5021  ▼aThesis  (Ph.D.)--Princeton  University,  2025.
■520    ▼aA  quantum  system  is  rarely  isolated  from  its  environment;  in  other  words,  it  is  open.  It  exchanges  energy,  particles,  and  other  charges  with  its  environment.  Such  dissipative  processes  fundamentally  alter  its  dynamics.  In  mathematical  terms,  the  time  evolution  becomes  non-Unitary  and  can  no  longer  be  described  by  a  Hermitian  Hamiltonian.  Thus,  open  systems  exhibit  new  phenomena  that  do  not  occur  in  closed  quantum  systems.  In  this  work,  we  study  emergent  phenomena  in  open  many-body  quantum  systems.  As  prototypical  examples  of  strongly  interacting  dissipative  quantum  matter,  we  analyze  Lindbladian  versions  of  the  Sachdev-Ye-Kitaev  (SYK)  model.  The  steady-state  Green's  functions  of  these  models  display  an  overdamped  to  underdamped  transition  as  dissipation  strength  is  reduced.  Reducing  it  further,  we  observe  that  the  steady-state  relaxation  rate  remains  non-zero  even  as  the  dissipation  strength  vanishes.  This  is  called  anomalous  dissipation  and  has  since  been  established  as  a  generic  feature  of  many-body  Lindbladians.  To  characterize  far-from-equilibrium  dynamics  of  these  models  we  calculate  the  average  Loschmidt  echo  starting  from  a  random  initial  state.  We  find  that  the  system  undergoes  dynamical  phase  transitions  signalled  by  non-analytic  behavior  of  the  Loschmidt  as  a  function  of  time.  Using  this  data,  we  construct  dynamical  phase  diagrams  of  these  models  which  feature  first-  and  second-order  transitions  as  well  as  a  dynamical  crossover.  After  studying  these  collective  phenomena  at  large  system  size,  we  analyze  the  symmetry  properties  of  these  models  at  finite  system  size.  We  build  a  periodic  table  of  the  SYK  Lindbladians  based  on  internal  symmetry  and  the  associated  38-fold  classification  scheme  for  non-Hermitian  matrices.  More  generally,  we  construct  all  relevant  internal  symmetry  operators  for  generic  fermionic  Lindbladians.  Previously,  it  was  conjectured  based  on  numerical  evidence  that  a  particular  internal  symmetry,  namely  Time  Reversal  Symmetry†   (TRS†),  gives  rise  to  two  new  universality  classes  for  non-Hermitian  quantum  chaos.  In  our  work  we  analytically  calculate  exact  expressions  for  statistical  properties  of  random  matrices  in  these  conjectured  universality  classes.  Our  results  corroborate  the  universality  conjecture  and  lay  the  foundation  to  rigorously  quantify  universal  correlations  in  chaotic  open  quantum  systems.
■590    ▼aSchool  code:  0181.
■650  4▼aCondensed  matter  physics
■650  4▼aStatistical  physics
■650  4▼aTheoretical  physics
■650  4▼aPhysics
■650  4▼aQuantum  physics
■653    ▼aNon-hermitian  physics
■653    ▼aOpen  quantum  systems
■653    ▼aRandom  matrix  theory
■653    ▼aSachdev-Ye-Kitaev  model
■690    ▼a0611
■690    ▼a0217
■690    ▼a0753
■690    ▼a0599
■690    ▼a0605
■71020▼aPrinceton  University▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g87-06B.
■790    ▼a0181
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360029▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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