Anomalous Quantum Oscillations of Interacting Electron-Hole Gases in Inverted Type-II InAs/GaSb Quantum Wells

Di Xiao, Chao Xing Liu, Nitin Samarth, Lun Hui Hu

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

We report magnetotransport studies of InAs/GaSb bilayer quantum wells in a regime where the interlayer tunneling between the electron and hole gases is suppressed. When the chemical potential is tuned close to the charge neutrality point, we observe anomalous quantum oscillations that are inversely periodic in magnetic field and that have an extremely high frequency despite the highly insulating regime where they are observed. The seemingly contradictory coexistence of a high sheet resistance and high frequency quantum oscillations in the charge neutrality regime cannot be understood within the single-particle picture. We propose an interpretation that attributes our experimental observation to the Coulomb drag between the electron and hole gases, thus providing strong evidence of the significance of Coulomb interaction in this topological insulator.

Original languageEnglish (US)
Article number186802
JournalPhysical Review Letters
Volume122
Issue number18
DOIs
StatePublished - May 10 2019

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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