Anisotropic Zeeman shift in p-type GaAs quantum point contacts

Komijani, Y. and Csontos, M. and Shorubalko, I. and Zülicke, U. and Ihn, T. and Ensslin, K. and Reuter, D. and Wieck, A. D. (2013) Anisotropic Zeeman shift in p-type GaAs quantum point contacts. EUROPHYSICS LETTERS, 102 (3). 37002/6. ISSN 0295-5075

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Abstract

Low-temperature electrical conductance spectroscopy measurements of quantum point contacts implemented in p-type GaAs/AlGaAs heterostructures are used to study the Zeeman splitting of 1D subbands for both in-plane and out-of-plane magnetic field orientations. The resulting in-plane g-factors agree qualitatively with those of previous experiments on quantum wires while the quantitative differences can be understood in terms of the enhanced quasi-1D confinement anisotropy. The influence of confinement potential on the anisotropy is discussed and an estimate for the out-of-plane g-factor is obtained which, in contrast to previous experiments, is close to the theoretical prediction.

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