Giant spin-orbit splitting in inverted InAs/GaSb double quantum wells

24 Nov 2016  ·  Nichele Fabrizio, Kjaergaard Morten, Suominen Henri J., Skolasinski Rafal, Wimmer Michael, Nguyen Binh-Minh, Kiselev Andrey A., Yi Wei, Sokolich Marko, Manfra Michael J., Qu Fanming, Beukman Arjan J. A., Kouwenhoven Leo P., Marcus Charles M. ·

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. read more

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Mesoscale and Nanoscale Physics