Topological charge-density and spin-density waves in InAs/GaSb quantum wells under an in-plane magnetic field

Lun Hui Hu, Chih Chieh Chen, Chao Xing Liu, Fu Chun Zhang, Yi Zhou

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We study interaction effect of quantum spin Hall state in InAs/GaSb quantum wells under an in-plane magnetic field by using the self-consistent mean field theory. We construct a phase diagram as a function of intralayer and interlayer interactions, and identify two novel phases, a charge-/spin-density wave phase and an exciton condensate phase. The charge-/spin-density wave phase is topologically nontrivial with helical edge transport at the boundary, while the exciton condensate phase is topologically trivial. The Zeeman effect is strongly renormalized due to interaction in certain parameter regimes of the system, leading to a much smaller g factor, which may stabilize the helical edge transport.

Original languageEnglish (US)
Article number075130
JournalPhysical Review B
Volume96
Issue number7
DOIs
StatePublished - Aug 15 2017

Fingerprint

Spin density waves
Charge density
Excitons
Semiconductor quantum wells
quantum wells
Magnetic fields
Mean field theory
condensates
excitons
magnetic fields
Phase diagrams
Zeeman effect
interactions
interlayers
phase diagrams
indium arsenide
LDS 751

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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abstract = "We study interaction effect of quantum spin Hall state in InAs/GaSb quantum wells under an in-plane magnetic field by using the self-consistent mean field theory. We construct a phase diagram as a function of intralayer and interlayer interactions, and identify two novel phases, a charge-/spin-density wave phase and an exciton condensate phase. The charge-/spin-density wave phase is topologically nontrivial with helical edge transport at the boundary, while the exciton condensate phase is topologically trivial. The Zeeman effect is strongly renormalized due to interaction in certain parameter regimes of the system, leading to a much smaller g factor, which may stabilize the helical edge transport.",
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Topological charge-density and spin-density waves in InAs/GaSb quantum wells under an in-plane magnetic field. / Hu, Lun Hui; Chen, Chih Chieh; Liu, Chao Xing; Zhang, Fu Chun; Zhou, Yi.

In: Physical Review B, Vol. 96, No. 7, 075130, 15.08.2017.

Research output: Contribution to journalArticle

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T1 - Topological charge-density and spin-density waves in InAs/GaSb quantum wells under an in-plane magnetic field

AU - Hu, Lun Hui

AU - Chen, Chih Chieh

AU - Liu, Chao Xing

AU - Zhang, Fu Chun

AU - Zhou, Yi

PY - 2017/8/15

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AB - We study interaction effect of quantum spin Hall state in InAs/GaSb quantum wells under an in-plane magnetic field by using the self-consistent mean field theory. We construct a phase diagram as a function of intralayer and interlayer interactions, and identify two novel phases, a charge-/spin-density wave phase and an exciton condensate phase. The charge-/spin-density wave phase is topologically nontrivial with helical edge transport at the boundary, while the exciton condensate phase is topologically trivial. The Zeeman effect is strongly renormalized due to interaction in certain parameter regimes of the system, leading to a much smaller g factor, which may stabilize the helical edge transport.

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