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• W3079954591 abstract "Semiconductor Rashba nanowires are quasi-one-dimensional systems that have large spin-orbit (SO) coupling arising from a broken inversion symmetry due to an external electric field. There exist parametrized multiband models that can describe accurately this effect. However, simplified single band models are highly desirable to study geometries of recent experimental interest, since they may allow to incorporate the effects of the low dimensionality and the nanowire electrostatic environment at a reduced computational cost. Commonly used conduction band approximations, valid for bulk materials, greatly underestimate the SO coupling in zinc-blende crystal structures and overestimate it for wurtzite ones when applied to finite cross-section wires, where confinement effects turn out to play an important role. We demonstrate here that an effective equation for the linear Rashba SO coupling of the semiconductor conduction band can reproduce the behavior of more sophisticated eight-band k·p model calculations. This is achieved by adjusting a single effective parameter that depends on the nanowire crystal structure and its chemical composition. We further compare our results to the Rashba coupling extracted from magnetoconductance measurements in several experiments on InAs and InSb nanowires, finding excellent agreement. This approach may be relevant in systems where Rashba coupling is known to play a major role, such as in spintronic devices or Majorana nanowires.2 MoreReceived 7 February 2020Revised 15 June 2020Accepted 17 July 2020DOI:https://doi.org/10.1103/PhysRevResearch.2.033264Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasRashba couplingSpin-orbit couplingCondensed Matter, Materials & Applied Physics" @default.
• W3079954591 created "2020-08-24" @default.
• W3079954591 creator A5003777022 @default.
• W3079954591 creator A5024675787 @default.
• W3079954591 creator A5065207196 @default.
• W3079954591 date "2020-08-18" @default.
• W3079954591 modified "2023-10-13" @default.
• W3079954591 title "Improved effective equation for the Rashba spin-orbit coupling in semiconductor nanowires" @default.
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• W3079954591 doi "https://doi.org/10.1103/physrevresearch.2.033264" @default.
• W3079954591 hasPublicationYear "2020" @default.
• W3079954591 type Work @default.
• W3079954591 sameAs 3079954591 @default.

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