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How Non-Hermitian Superfluids Are Special? Theory and Experiments
How Non-Hermitian Superfluids Are Special? Theory and Experiments
How Non-Hermitian Superfluids Are Special? Theory and Experiments

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자료유형  
 학위논문 서양
최종처리일시  
20250211151140
ISBN  
9798383182031
DDC  
530
저자명  
Tao, Junheng.
서명/저자  
How Non-Hermitian Superfluids Are Special? Theory and Experiments
발행사항  
[Sl] : University of Maryland, College Park, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
242 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-01, Section: B.
주기사항  
Advisor: Spielman, Ian B.;Rolston, Steven.
학위논문주기  
Thesis (Ph.D.)--University of Maryland, College Park, 2024.
초록/해제  
요약Ultracold atoms emerge as a promising advanced platform for researching the principles of quantum mechanics. Its development of scientific understanding and technology enriches the toolbox for quantum simulations and quantum computations. In this dissertation work, we describe the methods we applied to build our new high-resolution 87Rb Bose-Einstein condensate (BEC) machine integrated with versatile quantum control and measurement tools. Then we describe the applications of these tools to the research of novel superfluidity and non-Hermitian physics.Superfluids and normal fluids were often studied in the context of Landau's two-fluid model, where the normal fluid stemmed from thermally excited atoms in a superfluid background. But can there be normal fluids in the ground state of a pure BEC, at near zero temperature? Our work addressed the understanding of this scenario, and then measured the anisotropic superfluid density in a density-modulated BEC, where the result matched the prediction of the Leggett formula proposed for supersolids. We further considered and measured this BEC in rotation and found a non-classical moment of inertia that sometimes turns negative. We distinguished the roles of superfluid and normal fluid flows, and linked some features to the dipolar and spin-orbit coupled supersolids.As a second direction, we describe our capability to create non-Hermiticity with Raman lasers, digital-micromirror device (DMD), and microwave, and present our work in engineering the real space non-Hermitian skin effect with a spin-orbit coupled BEC. By use of a spin-dependent dissipative channel, we realized an imaginary gauge potential which led to nonreciprocal transport in the flat box trap. We studied the system dynamics by quenching the dissipation, and further prepared stationary edge states. We link our discoveries to a non-Hermitian topological class characterized by a quantized winding number. Finally, we discuss the exciting promises of using these tools to study many-body physics open quantum systems.
일반주제명  
Physics
일반주제명  
Quantum physics
일반주제명  
Atomic physics
키워드  
Bose-Einstein condensates
키워드  
Non-Hermitian physics
키워드  
Quantum simulations
키워드  
Superfluidity
키워드  
Ultracold atoms
기타저자  
University of Maryland, College Park Chemical Physics
기본자료저록  
Dissertations Abstracts International. 86-01B.
전자적 위치 및 접속  
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MARC

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■006m          o    d                
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■020    ▼a9798383182031
■035    ▼a(MiAaPQ)AAI31149229
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530
■1001  ▼aTao,  Junheng.▼0(orcid)0000-0002-8436-9192
■24510▼aHow  Non-Hermitian  Superfluids  Are  Special?  Theory  and  Experiments
■260    ▼a[Sl]▼bUniversity  of  Maryland,  College  Park▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a242  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-01,  Section:  B.
■500    ▼aAdvisor:  Spielman,  Ian  B.;Rolston,  Steven.
■5021  ▼aThesis  (Ph.D.)--University  of  Maryland,  College  Park,  2024.
■520    ▼aUltracold  atoms  emerge  as  a  promising  advanced  platform  for  researching  the  principles  of  quantum  mechanics.  Its  development  of  scientific  understanding  and  technology  enriches  the  toolbox  for  quantum  simulations  and  quantum  computations.  In  this  dissertation  work,  we  describe  the  methods  we  applied  to  build  our  new  high-resolution  87Rb  Bose-Einstein  condensate  (BEC)  machine  integrated  with  versatile  quantum  control  and  measurement  tools.  Then  we  describe  the  applications  of  these  tools  to  the  research  of  novel  superfluidity  and  non-Hermitian  physics.Superfluids  and  normal  fluids  were  often  studied  in  the  context  of  Landau's  two-fluid  model,  where  the  normal  fluid  stemmed  from  thermally  excited  atoms  in  a  superfluid  background.  But  can  there  be  normal  fluids  in  the  ground  state  of  a  pure  BEC,  at  near  zero  temperature?  Our  work  addressed  the  understanding  of  this  scenario,  and  then  measured  the  anisotropic  superfluid  density  in  a  density-modulated  BEC,  where  the  result  matched  the  prediction  of  the  Leggett  formula  proposed  for  supersolids.  We  further  considered  and  measured  this  BEC  in  rotation  and  found  a  non-classical  moment  of  inertia  that  sometimes  turns  negative.  We  distinguished  the  roles  of  superfluid  and  normal  fluid  flows,  and  linked  some  features  to  the  dipolar  and  spin-orbit  coupled  supersolids.As  a  second  direction,  we  describe  our  capability  to  create  non-Hermiticity  with  Raman  lasers,  digital-micromirror  device  (DMD),  and  microwave,  and  present  our  work  in  engineering  the  real  space  non-Hermitian  skin  effect  with  a  spin-orbit  coupled  BEC.  By  use  of  a  spin-dependent  dissipative  channel,  we  realized  an  imaginary  gauge  potential  which  led  to  nonreciprocal  transport  in  the  flat  box  trap.  We  studied  the  system  dynamics  by  quenching  the  dissipation,  and  further  prepared  stationary  edge  states.  We  link  our  discoveries  to  a  non-Hermitian  topological  class  characterized  by  a  quantized  winding  number.  Finally,  we  discuss  the  exciting  promises  of  using  these  tools  to  study  many-body  physics  open  quantum  systems.
■590    ▼aSchool  code:  0117.
■650  4▼aPhysics
■650  4▼aQuantum  physics
■650  4▼aAtomic  physics
■653    ▼aBose-Einstein  condensates
■653    ▼aNon-Hermitian  physics
■653    ▼aQuantum  simulations
■653    ▼aSuperfluidity
■653    ▼aUltracold  atoms
■690    ▼a0605
■690    ▼a0599
■690    ▼a0748
■71020▼aUniversity  of  Maryland,  College  Park▼bChemical  Physics.
■7730  ▼tDissertations  Abstracts  International▼g86-01B.
■790    ▼a0117
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17160945▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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