Highly Anisotropic Even-Denominator Fractional Quantum Hall State in an Orbitally Coupled Half-Filled Landau Level

被引：1

作者：

Wang, Chengyu ^{[1
]}

Gupta, A. ^{[1
]}

Chung, Y. J. ^{[1
]}

Pfeiffer, L. N. ^{[1
]}

West, K. W. ^{[1
]}

Baldwin, K. W. ^{[1
]}

Winkler, R. ^{[2
]}

Shayegan, M. ^{[1
]}

机构：

[1] Princeton Univ, Dept Elect & Comp Engn, Princeton, NJ 08544 USA

[2] Northern Illinois Univ, Dept Phys, De Kalb, IL 60115 USA

来源：

PHYSICAL REVIEW LETTERS | 2023年 / 131卷 / 05期

基金：

美国国家科学基金会;

关键词：

2-DIMENSIONAL ELECTRON LIQUID; TRANSPORT; PHYSICS; PHASES; NU=5/2; WAVE; GAS;

D O I：

10.1103/PhysRevLett.131.056302

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The even-denominator fractional quantum Hall states (FQHSs) in half-filled Landau levels are generally believed to host non-Abelian quasiparticles and be of potential use in topological quantum computing. Of particular interest is the competition and interplay between the even-denominator FQHSs and other ground states, such as anisotropic phases and composite fermion Fermi seas. Here, we report the observation of an even-denominator fractional quantum Hall state with highly anisotropic in-plane transport coefficients at Landau level filling factor nu = 3/2. We observe this state in an ultra-high-quality GaAs two-dimensional hole system when a large in-plane magnetic field is applied. By increasing the in-plane field, we observe a sharp transition from an isotropic composite fermion Fermi sea to an anisotropic even-denominator FQHS. Our data and calculations suggest that a unique feature of two-dimensional holes, namely the coupling between heavy-hole and light-hole states, combines different orbital components in the wave function of one Landau level, and leads to the emergence of a highly anisotropic even-denominator fractional quantum Hall state. Our results demonstrate that the GaAs two-dimensional hole system is a unique platform for the exploration of exotic, many-body ground states.

引用

页数：7