Berlin 2015 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 102: Transport: Quantum Dots, Quantum Wires, Point Contacts 2 (jointly with HL)
TT 102.1: Talk
Thursday, March 19, 2015, 15:00–15:15, A 053
Weak antilocalization and spin-orbit interaction in epitaxial nanowires — Brian Tarasinski1, Ilse van Weperen2, Debbie Eeltink2, Vlad Pribiag2, Erik Bakkers2,3, Leo Kouwenhoven2, and •Michael Wimmer2 — 1Leiden 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.