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The authors would like to thank Eduardo J. H. Lee for valuable discussions. Research supported by the Spanish Ministry of Economy and Competitiveness through Grants FIS2016-80434-P, BES-2017-080374 and FIS2017-84860-R (AEI/FEDER, EU), the European Union's Horizon 2020 research and innovation programme FETOpen Grant No. 828948 (AndQC), the Ramon y Cajal programme RYC-2011-09345 and the Maria de Maeztu Programme for Units of Excellence in R&D (CEX2018-000805-M).

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Improved effective equation for the Rashba spin-orbit coupling in semiconductor nanowires

Publicado en:PHYSICAL REVIEW RESEARCH. 2 (3): 033264- - 2020-08-18 2(3), DOI: 10.1103/PhysRevResearch.2.033264

Autores: Escribano, Samuel D; Yeyati, Alfredo Levy; Prada, Elsa

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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.

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