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