Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 102: Transport: Quantum Dots, Quantum Wires, Point Contacts 2 (jointly with HL)

TT 102.1: Vortrag

Donnerstag, 19. März 2015, 15:00–15:15, A 053

Weak antilocalization and spin-orbit interaction in epitaxial nanowiresBrian Tarasinski1, Ilse van Weperen2, Debbie Eeltink2, Vlad Pribiag2, Erik Bakkers2,3, Leo Kouwenhoven2, and •Michael Wimmer21Leiden University, The Netherlands — 2Delft University of Technology, The Netherlands — 3Eindhoven University of Technology, The Netherlands

We develop a theory of weak antilocalization for three-dimensional nanowires that allows for a quantitative extraction of spin-orbit strength. To this end we perform numerical Monte Carlo simulations of classical trajectories that are used in the quasiclassical theory of weak antilocalization. In particular, we show that magnetoconductance in three-dimensional nanowires is very different compared to wires in two-dimensional electron gases

Focusing on the case of Rashba spin-orbit interaction, we then use this theory to extract the Rashba spin-orbit strength from weak antilocalization measurements in epitaxially grown InSb nanowires. We find a spin-orbit energy on the order of 0.25-1 meV.

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DPG-Physik > DPG-Verhandlungen > 2015 > Berlin