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

Journal Article (2017)
Authors

F. Nichele (University of Copenhagen)

M. Kjaergaard (University of Copenhagen)

H. J. Suominen (University of Copenhagen)

Rafal Skolasinski (TU Delft - QRD/Wimmer Group, TU Delft - QuTech Advanced Research Centre)

Michael Wimmer (TU Delft - QuTech Advanced Research Centre, (OLD) Chair of Relation to Practice ur)

Binh Minh Nguyen (HRL Laboratories)

F. Qu (TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Kouwenhoven Lab)

Arjan J.A. Beukman (TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Kouwenhoven Lab)

LP Kouwenhoven (TU Delft - QRD/Kouwenhoven Lab, TU Delft - QuTech Advanced Research Centre)

Research Group
QRD/Wimmer Group
Copyright
© 2017 Fabrizio Nichele, Morten Kjaergaard, Henri J. Suominen, R.J. Skolasinski, M Wimmer, Binh Minh Nguyen, F. Qu, A.J.A. Beukman, Leo P. Kouwenhoven
To reference this document use:
https://doi.org/10.1103/PhysRevLett.118.016801
More Info
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Publication Year
2017
Language
English
Copyright
© 2017 Fabrizio Nichele, Morten Kjaergaard, Henri J. Suominen, R.J. Skolasinski, M Wimmer, Binh Minh Nguyen, F. Qu, A.J.A. Beukman, Leo P. Kouwenhoven
Research Group
QRD/Wimmer Group
Issue number
1
Volume number
118
DOI:
https://doi.org/10.1103/PhysRevLett.118.016801
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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.