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arXiv · 1605.01241

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·Andrey A. Kiselev·Wei Yi·Marko Sokolich·Michael J. Manfra·Fanming Qu·Arjan J. A. Beukman·Leo P. Kouwenhoven·Charles M. Marcus
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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 electron-like and hole-like 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 $e^2/h$ steps and a non-trivial Berry phase.

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Fabrizio Nichele, Morten Kjaergaard, Henri J. Suominen, Rafal Skolasinski, Michael Wimmer, Binh-Minh Nguyen, Andrey A. Kiselev, Wei Yi, Marko Sokolich, Michael J. Manfra, Fanming Qu, Arjan J. A. Beukman, Leo P. Kouwenhoven, Charles M. Marcus. 2016-11-24. Giant spin-orbit splitting in inverted InAs/GaSb double quantum wells. https://doi.org/10.1103/physrevlett.118.016801

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