Spin and impurity effects on flux-periodic oscillations in core-shell nanowires

Tomas Orn Rosdahl, Andrei Manolescu, and Vidar Gudmundsson
Phys. Rev. B 90, 035421 – Published 17 July 2014

Abstract

We study the quantum mechanical states of electrons situated on a cylindrical surface of finite axial length to model a semiconductor core-shell nanowire. We calculate the conductance in the presence of a longitudinal magnetic field by weakly coupling the cylinder to semi-infinite leads. Spin effects are accounted for through Zeeman coupling and Rashba spin-orbit interaction (SOI). Emphasis is on manifestations of flux-periodic oscillations and we show how factors such as impurities, contact geometry, and spin affect them. Oscillations survive and remain periodic in the presence of impurities, noncircular contacts, and SOI, while Zeeman splitting results in aperiodicity, beating patterns, and additional background fluctuations. Our results are in qualitative agreement with recent magnetotransport experiments performed on GaAs/InAs core-shell nanowires. Lastly, we propose methods of data analysis for detecting the presence of Rashba SOI in core-shell systems and for estimating the electron g factor in the shell.

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  • Received 7 April 2014
  • Revised 27 June 2014

DOI:https://doi.org/10.1103/PhysRevB.90.035421

©2014 American Physical Society

Authors & Affiliations

Tomas Orn Rosdahl1,*, Andrei Manolescu2, and Vidar Gudmundsson1

  • 1Science Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavik, Iceland
  • 2School of Science and Engineering, Reykjavik University, Menntavegur 1, IS-101 Reykjavik, Iceland

  • *torosdahl@gmail.com

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Issue

Vol. 90, Iss. 3 — 15 July 2014

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