Berlin 2018 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 19: Quantum dots and wires: Transport properties

HL 19.14: Vortrag

Dienstag, 13. März 2018, 13:00–13:15, A 151

Orbital contributions to the electron g-factor in semiconductor nanowiresGeorg Winkler2, Daniel Varjas1, •Rafal Skolasinski1, Alexey Soluyanov2, Matthias Troyer2,3, and Michael Wimmer11QuTech, Delft University of Technology, Delft, Netherlands — 2Theoretical Physics and Station Q, ETH Zurich, Zurich, Switzerland — 3Quantum Architectures and Computation Group, Microsoft Research, Redmond, WA, United States

Recent experiments on Majorana fermions in semiconductor nanowires [Albrecht et al., Nat. 531, 206 (2016)] revealed a surprisingly large electronic Landé g-factor, several times larger than the bulk value - contrary to the expectation that confinement reduces the g-factor. Here we assess the role of orbital contributions to the electron g-factor in nanowires and quantum dots. We show that an LS coupling in higher subbands leads to an enhancement of the g-factor of an order of magnitude or more for small effective mass semiconductors. We validate our theoretical finding with simulations of InAs and InSb, showing that the effect persists even if cylindrical symmetry is broken. A huge anisotropy of the enhanced g-factors under magnetic field rotation allows for a straightforward experimental test of this theory.

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