Ultra-high-quality two-dimensional electron systems

Chung, Yoon Jang; Rosales, K. A. Villegas; Baldwin, K. W.; Madathil, P. T.; West, K. W.; Shayegan, M.; Pfeiffer, L. N.

doi:10.1038/s41563-021-00942-3

Cited by 121 publications

(88 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A major portion of the FQHE phenomenology that occurs in the LLL can be wellunderstood using the theory of non-interacting CFs [3]. Nevertheless, in the range of fillings 1/3 < ν < 2/5 very high-quality samples exhibit signatures of FQHE at ν = 4/11, 5/13, 6/17, 3/8, 3/10, 4/13, and 5/17 [4][5][6][7][8]. An understanding of these fragile states necessitates going beyond the framework of weakly interacting composite fermions as these states likely arise from an FQHE of CFs themselves [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Fractional quantum Hall effect at ν=2+4/9

Balram

Wójs

2020

Phys. Rev. Research

View full text Add to dashboard Cite

We consider the fractional quantum Hall effect at the filling ν = 6/17, where experiments have observed features of incompressibility in the form of a minimum in the longitudinal resistance. We propose a parton state denoted as "321 3 " and show it to be a feasible candidate to capture the ground state at ν = 6/17. We work out the low-energy effective theory of the 321 3 edge and make several predictions for experimentally measurable properties of the state which can help detect its underlying topological order. Intriguingly, we find that the 321 3 state likely lies in the same universality class as the state obtained from composite-fermionizing the 1+1/5 Laughlin state.

show abstract

Section: Introductionmentioning

confidence: 99%

Fractional quantum Hall effect at ν=2+4/9

Balram

Wójs

2020

Phys. Rev. Research

View full text Add to dashboard Cite

show abstract

“…Sample 2 is also a 2DEG confined to a GaAs/AlGaAs heterostructure, but differs in several aspects from Sample 1. It belongs to the most recent generation of highmobility samples 67 . Its density is significantly less than that of Sample 1, n = 1.0 × 10 11 cm −2 , and its mobility is μ = 3.5 × 10 7 cm 2 /Vs.…”

Section: Methodsmentioning

confidence: 99%

Particle-hole symmetry and the reentrant integer quantum Hall Wigner solid

et al. 2021

View full text Add to dashboard Cite

The interplay of strong Coulomb interactions and of topology is currently under intense scrutiny in various condensed matter and atomic systems. One example of this interplay is the phase competition of fractional quantum Hall states and the Wigner solid in the two-dimensional electron gas. Here we report a Wigner solid at ν = 1.79 and its melting due to fractional correlations occurring at ν = 9/5. This Wigner solid, that we call the reentrant integer quantum Hall Wigner solid, develops in a range of Landau level filling factors that is related by particle-hole symmetry to the so called reentrant Wigner solid. We thus find that the Wigner solid in the GaAs/AlGaAs system straddles the partial filling factor 1/5 not only at the lowest filling factors, but also near ν = 9/5. Our results highlight the particle-hole symmetry as a fundamental symmetry of the extended family of Wigner solids and paint a complex picture of the competition of the Wigner solid with fractional quantum Hall states.

show abstract

“…Modern molecular beam epitaxy makes it possible to grow selectively doped GaAs quantum wells where the two-dimensional (2D) electron gas has a low-temperature mobility of m 2 /(V s) [1][2][3][4]. However, despite the advances made in growing technology and optimizing the design of high-mobility heterostructures, they are not ideal 2D electron systems.…”

Section: Doi: 101134/s0021364021190048mentioning

confidence: 99%