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Hybrid Metal-Semiconductor Quantum Dots as a Platform for Quantum Simulation of Kondo Lattice Models
Hybrid Metal-Semiconductor Quantum Dots as a Platform for Quantum Simulation of Kondo Latt...
Hybrid Metal-Semiconductor Quantum Dots as a Platform for Quantum Simulation of Kondo Lattice Models

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20260202105612
ISBN  
9798265429551
DDC  
000
저자명  
Sriram, Praveen.
서명/저자  
Hybrid Metal-Semiconductor Quantum Dots as a Platform for Quantum Simulation of Kondo Lattice Models
발행사항  
[Sl] : Stanford University, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
237 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-05, Section: A.
주기사항  
Advisor: Goldhaber-Gordon, David.
학위논문주기  
Thesis (Ph.D.)--Stanford University, 2025.
초록/해제  
요약Quantum systems that host exotic material phenomena-such as unconventional superconductivity and strong magnetism-are governed by complex many-body interactions at the microscopic scale. Simplified models such as the Kondo lattice capture essential aspects of these systems, but even these abstractions quickly exceed the capabilities of classical simulation. This challenge motivates the development of engineered quantum simulators: controllable, scalable platforms that can emulate strongly correlated physics.In this dissertation, we present a new approach to quantum simulation based on hybrid metal-semiconductor quantum dots. These devices combine the uniformity of metallic islands with the tunability of semiconductor heterostructures, offering a pathway to scalable arrays that connect to bulk material properties. In particular, we focus on hybrid metal--InAs quantum dots, a promising platform for probing lattice coherence over a wide temperature range relevant to heavy fermion materials.After introducing the motivation and theoretical context, we describe the growth and characterization of InAs quantum wells that host these devices, including transport in the integer quantum Hall regime. We then demonstrate smooth, monotonic control of edge-mode transmission using quantum point contacts, a key ingredient for defining hybrid dots with tunable couplings. Building on this, we characterize submicron metallic islands coupled to quantum Hall edge states, developing a Landauer--Buttiker model to extract their transparency. We identify challenges with conventional Ti/Au islands and establish robust contacts using PdGe, achieving reproducible high-transparency coupling.Integrating these components, we realize hybrid metal--InAs quantum dots. These devices exhibit a four-fold enhancement of charging energy compared to the GaAs platform. They display exceptional uniformity in charge quantization, control of tunneling from the weak- to strong-coupling limits, culminating in the quenching of charge quantization at the ballistic limit with a transition from static to dynamical Coulomb blockade. Preliminary work with Ge/SiGe quantum wells is also presented, pointing to future opportunities for reduced disorder and improved scalability.Together, these results establish hybrid metal--InAs quantum dots as a highly controllable and scalable platform for exploring emergent behavior in correlated electron systems. They open a pathway toward simulating coherence in Kondo lattice models and, more broadly, toward engineering quantum matter.
일반주제명  
Summer school
일반주제명  
Electrons
일반주제명  
Spectrum analysis
일반주제명  
Quantum dots
일반주제명  
Magnetic fields
일반주제명  
Pandemics
일반주제명  
Analytical chemistry
일반주제명  
Atomic physics
일반주제명  
Epidemiology
일반주제명  
Optics
일반주제명  
Education
일반주제명  
Electromagnetics
기타저자  
Stanford University.
기본자료저록  
Dissertations Abstracts International. 87-05A.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■1001  ▼aSriram,  Praveen.
■24510▼aHybrid  Metal-Semiconductor  Quantum  Dots  as  a  Platform  for  Quantum  Simulation  of  Kondo  Lattice  Models
■260    ▼a[Sl]▼bStanford  University▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a237  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-05,  Section:  A.
■500    ▼aAdvisor:  Goldhaber-Gordon,  David.
■5021  ▼aThesis  (Ph.D.)--Stanford  University,  2025.
■520    ▼aQuantum  systems  that  host  exotic  material  phenomena-such  as  unconventional  superconductivity  and  strong  magnetism-are  governed  by  complex  many-body  interactions  at  the  microscopic  scale.  Simplified  models  such  as  the  Kondo  lattice  capture  essential  aspects  of  these  systems,  but  even  these  abstractions  quickly  exceed  the  capabilities  of  classical  simulation.  This  challenge  motivates  the  development  of  engineered  quantum  simulators:  controllable,  scalable  platforms  that  can  emulate  strongly  correlated  physics.In  this  dissertation,  we  present  a  new  approach  to  quantum  simulation  based  on  hybrid  metal-semiconductor  quantum  dots.  These  devices  combine  the  uniformity  of  metallic  islands  with  the  tunability  of  semiconductor  heterostructures,  offering  a  pathway  to  scalable  arrays  that  connect  to  bulk  material  properties.  In  particular,  we  focus  on  hybrid  metal--InAs  quantum  dots,  a  promising  platform  for  probing  lattice  coherence  over  a  wide  temperature  range  relevant  to  heavy  fermion  materials.After  introducing  the  motivation  and  theoretical  context,  we  describe  the  growth  and  characterization  of  InAs  quantum  wells  that  host  these  devices,  including  transport  in  the  integer  quantum  Hall  regime.  We  then  demonstrate  smooth,  monotonic  control  of  edge-mode  transmission  using  quantum  point  contacts,  a  key  ingredient  for  defining  hybrid  dots  with  tunable  couplings.  Building  on  this,  we  characterize  submicron  metallic  islands  coupled  to  quantum  Hall  edge  states,  developing  a  Landauer--Buttiker  model  to  extract  their  transparency.  We  identify  challenges  with  conventional  Ti/Au  islands  and  establish  robust  contacts  using  PdGe,  achieving  reproducible  high-transparency  coupling.Integrating  these  components,  we  realize  hybrid  metal--InAs  quantum  dots.  These  devices  exhibit  a  four-fold  enhancement  of  charging  energy  compared  to  the  GaAs  platform.  They  display  exceptional  uniformity  in  charge  quantization,  control  of  tunneling  from  the  weak-  to  strong-coupling  limits,  culminating  in  the  quenching  of  charge  quantization  at  the  ballistic  limit  with  a  transition  from  static  to  dynamical  Coulomb  blockade.  Preliminary  work  with  Ge/SiGe  quantum  wells  is  also  presented,  pointing  to  future  opportunities  for  reduced  disorder  and  improved  scalability.Together,  these  results  establish  hybrid  metal--InAs  quantum  dots  as  a  highly  controllable  and  scalable  platform  for  exploring  emergent  behavior  in  correlated  electron  systems.  They  open  a  pathway  toward  simulating  coherence  in  Kondo  lattice  models  and,  more  broadly,  toward  engineering  quantum  matter.
■590    ▼aSchool  code:  0212.
■650  4▼aSummer  school
■650  4▼aElectrons
■650  4▼aSpectrum  analysis
■650  4▼aQuantum  dots
■650  4▼aMagnetic  fields
■650  4▼aPandemics
■650  4▼aAnalytical  chemistry
■650  4▼aAtomic  physics
■650  4▼aEpidemiology
■650  4▼aOptics
■650  4▼aEducation
■650  4▼aElectromagnetics
■690    ▼a0486
■690    ▼a0748
■690    ▼a0766
■690    ▼a0752
■690    ▼a0515
■690    ▼a0607
■71020▼aStanford  University.
■7730  ▼tDissertations  Abstracts  International▼g87-05A.
■790    ▼a0212
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360732▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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