Giant Spin-Orbit Splitting in Inverted InAs/GaSb Double Quantum Wells

Fabrizio Nichele, Morten Kjaergaard, Henri J. Suominen, Rafal Skolasinski, Michael Wimmer, Binh Minh Nguyen, Fanming Qu, Arjan J.A. Beukman, Leo P. Kouwenhoven

Research output: Contribution to journalArticleScientificpeer-review

24 Citations (Scopus)
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Abstract

Transport measurements in inverted InAs/GaSb quantum wells reveal a giant spin-orbit splitting of the energy bands close to the hybridization gap. The splitting results from the interplay of electron-hole mixing and spin-orbit coupling, and can exceed the hybridization gap. We experimentally investigate the band splitting as a function of top gate voltage for both electronlike and holelike states. Unlike conventional, noninverted two-dimensional electron gases, the Fermi energy in InAs/GaSb can cross a single spin-resolved band, resulting in full spin-orbit polarization. In the fully polarized regime we observe exotic transport phenomena such as quantum Hall plateaus evolving in e2/h steps and a nontrivial Berry phase.

Original languageEnglish
Article number016801
Number of pages6
JournalPhysical Review Letters
Volume118
Issue number1
DOIs
Publication statusPublished - 2017

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