Phase Competition and Domain Textures in the Fractional Quantum Hall Effect

分数量子霍尔效应中的相位竞争和域纹理

基本信息

  • 批准号:
    2103965
  • 负责人:
  • 金额:
    $ 75万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Continuing Grant
  • 财政年份:
    2021
  • 资助国家:
    美国
  • 起止时间:
    2021-12-01 至 2025-11-30
  • 项目状态:
    未结题

项目摘要

Non-Technical Abstract:This project investigates a fundamental physics phenomenon called fractional quantum Hall effect (FQHE), which is observed in semiconductor multilayer structures. The investigation is performed on unique ultra-high purity semiconductors exposed to high magnetic fields using novel high sensitivity optical technique. This combination of low-disorder semiconductors and novel measurement methods enables detection of extremely small signals of excitation modes that accompany interactions between electrons in these materials. Traditional methods of magneto-transport measurements are insufficient for detecting these excitations that occur in the bulk of these materials. Studies of these low-lying excitations provide important insights on fundamental interactions in electronic systems with subsequent impacts on the development of quantum computation technology. The project provides training in cutting-edge science to graduate and undergraduate students as well as postdoctoral researchers. Outreach activities are planned to attract diverse group including women and minorities.Technical Abstract:The work proposed in this project experimentally probes low-lying excitations in the bulk electron fluids of the fractional quantum Hall effect (FQHE) to understand physics of strong electron correlation in topologically protected electron fluids. While much of the correlation physics in the FQHE is understood in terms of composite fermion quasiparticles, more recent theories introduced an internal geometrical degree of freedom that impacts orbital motion in the large magnetic field due to intra-Landau electron Coulomb interactions. These interactions result in novel effects that uniquely manifest on the dispersions of low-lying excitations. The bulk of the FQHE fluids is known to be disordered in which domains of FQHE fluid coexist with domains of other phases of the two-dimensional (2D) electron fluid. Optical methods will be used to identify large domains of FQHE fluid in which the low-lying excitations have momentum dispersions that are like those of a uniform system. The low-lying modes are studied by advanced resonant inelastic light scattering methods developed in the group of the PI. At Landau level filling nu=1/3 the measurements will be focused on identification chiral gravitons of angular momentum L=-2 predicted by geometrical theories. Much of the proposed research efforts will be focused on the FQHE states of the second Landau level that is host to intriguing FQHE states at Landau level filling factors 5/2 and 7/3. In tilted magnetic field emergent nematic phases and their competition with FQHE phases in the bulk will be studied by optical methods.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
非技术摘要:该项目研究了一种基本的物理现象,称为分数量子霍尔效应(Fractional Quantum Hall Effect,简称FQHE),它在半导体多层结构中被观察到。本研究利用新颖的高灵敏度光学技术,对暴露于强磁场中的独特超高纯度半导体材料进行了研究。这种低无序半导体和新型测量方法的结合使得能够检测伴随这些材料中电子之间相互作用的激发模式的极小信号。传统的磁输运测量方法不足以检测这些材料中大量发生的这些激发。对这些低激发的研究为电子系统中的基本相互作用提供了重要的见解,并对量子计算技术的发展产生了后续影响。该项目为研究生和本科生以及博士后研究人员提供尖端科学培训。外联活动计划吸引不同的群体,包括妇女和少数民族。技术摘要:在这个项目中提出的工作实验探测分数量子霍尔效应(HALHE)的体电子流体中的低位激发,以了解拓扑保护的电子流体中的强电子相关物理。虽然大部分的相关物理学都是从复合费米子准粒子的角度来理解的,但最近的理论引入了一个内部几何自由度,由于朗道内电子库仑相互作用,它会影响大磁场中的轨道运动。这些相互作用的结果在新的效果,独特地表现在分散的低洼激发。已知大部分电子流体是无序的,其中电子流体的域与二维(2D)电子流体的其他相的域共存。光学方法将被用来识别大域的低激发的动量分散体,就像一个统一的系统。的低洼模式进行了研究,先进的共振非弹性光散射方法开发的PI组。在朗道能级填充数nu=1/3时,测量将集中于确定由几何理论预言的角动量L=-2的手征引力子。许多拟议的研究工作将集中在第二个朗道水平,这是主机有趣的朗道状态在朗道水平填充因子5/2和7/3的朗道状态。在倾斜磁场中,将通过光学方法研究突现的超导相及其与超导相的竞争。该奖项反映了NSF的法定使命,并通过使用基金会的知识价值和更广泛的影响审查标准进行评估,被认为值得支持。

项目成果

期刊论文数量(1)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Domain Textures in the Fractional Quantum Hall Effect
分数量子霍尔效应中的域纹理
  • DOI:
    10.1103/physrevlett.128.017401
  • 发表时间:
    2022
  • 期刊:
  • 影响因子:
    8.6
  • 作者:
    Liu, Ziyu;Wurstbauer, Ursula;Du, Lingjie;West, Ken W.;Pfeiffer, Loren N.;Manfra, Michael J.;Pinczuk, Aron
  • 通讯作者:
    Pinczuk, Aron
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Cory Dean其他文献

Cory Dean的其他文献

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{{ truncateString('Cory Dean', 18)}}的其他基金

Coulomb drag in ultra-clean and strongly interacting van der Waals materials: toward exciton condensation
超洁净和强相互作用范德华材料中的库仑阻力:朝向激子凝聚
  • 批准号:
    1507788
  • 财政年份:
    2015
  • 资助金额:
    $ 75万
  • 项目类别:
    Standard Grant
CAREER: Fractal Bandstructure by Superlattice Patterning
职业:超晶格图案化的分形能带结构
  • 批准号:
    1462383
  • 财政年份:
    2014
  • 资助金额:
    $ 75万
  • 项目类别:
    Continuing Grant
CAREER: Fractal Bandstructure by Superlattice Patterning
职业:超晶格图案化的分形能带结构
  • 批准号:
    1351337
  • 财政年份:
    2014
  • 资助金额:
    $ 75万
  • 项目类别:
    Continuing Grant

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