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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 nanowires — Brian Tarasinski¹, Ilse van Weperen², Debbie Eeltink², Vlad Pribiag², Erik Bakkers^2,3, 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.