Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 27: Focus Session: Topological Insulators on Coupled Quantum Wells (joint session DS, HL, MA, O, TT, organized by HL)
TT 27.7: Hauptvortrag
Dienstag, 21. März 2017, 12:15–12:45, POT 151
Giant Spin-Orbit Splitting in Inverted InAs/GaSb Double Quantum Wells — •Fabrizio Nichele1, Morten Kjaergaard1, Henri J. Suominen1, Rafal Skolasinski2, Michael Wimmer2, Binh-Minh Nguyen3, Andrey A. Kiselev3, Wei Yi3, Marko Sokolich3, Michael J. Manfra4, Fanming Qu2, Arjan J. A. Beukman2, Leo P. Kouwenhoven2, and Charles M. Marcus1 — 1Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark — 2QuTech, Delft University of Technology, 2600 GA Delft, The Netherlands — 3HRL Laboratories, 3011 Malibu Canyon Road, Malibu, California 90265, USA — 4Department of Physics and Astronomy and Station Q Purdue, Purdue University, West Lafayette, Indiana 47907 USA
We present transport measurements and numerical simulations that reveal a giant spin-orbit splitting of the bands in inverted InAs/GaSb quantum wells close to the hybridization gap. The splitting results from the interplay of electron-hole mixing and spin-orbit coupling, and can be larger than 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.