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HL: Fachverband Halbleiterphysik

HL 63: Poster: Quantum Dots and Optics

HL 63.21: Poster

Mittwoch, 22. März 2017, 15:00–19:00, P1A

Persistent Spin Textures and Quantum Interference in Arbitrary Oriented 2DEGs with Spin-Orbit Coupling — •Michael Kammermeier, Paul Wenk, and John Schliemann — Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany

We discover general conditions for the realization of spin-preserving symmetries for 2DEGs with Rashba and Dresselhaus spin-orbit coupling [1]. In particular, such scenarios can be found for semiconductor heterostructures of zinc-blende type if and only if at least two Miller indices of the growth direction are equal in modulus. We determine the appropriate requirements on the leading Rashba and Dresselhaus contributions and discuss the impact of cubic Dresselhaus terms corresponding to third angular harmonics. Also, we identify the orientation of the homogeneous conserved spin state and the momentum shift which allows for a controlled spin rotation giving rise to a persistent spin helix. To support experimental probing, we provide analytical expressions for the weak (anti)localization correction and the characteristic shift of the magnetoconductivity minima which show an imprint of the peculiar symmetry. The latter enables a fitting-free determination of the system’s transport parameters and is consistent with recent experimental observations [2].

[1] M. Kammermeier et al., Phys. Rev. Lett. 117, 236801 (2016).

[2] K. Yoshizumi et al., Appl. Phys. Lett. 108, 132402 (2016).