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Dataset Associated with 'Deconvolution of Rashba and Dresselhaus spin-orbit coupling by crystal axis dependent measurements of coupled InAs/GaSb quantum wells'

Knox, Craig and Li, Lianhe and Rosamond, Mark C. and Linfield, Edmund and Marrows, Christopher H. (2018) Dataset Associated with 'Deconvolution of Rashba and Dresselhaus spin-orbit coupling by crystal axis dependent measurements of coupled InAs/GaSb quantum wells'. University of Leeds. [Dataset] https://doi.org/10.5518/459

Dataset description

The Dresselhaus spin-orbit interaction is expected to perturb the quantum spin Hall phase predicted to arise within InAs/GaSb coupled quantum wells. To gain a greater understanding of this interaction, the spin-orbit coupling in two InAs/GaSb coupled quantum well samples, grown along the [001] axis, was investigated along three different in-plane crystallographic axes. By measuring the crystallographic axis dependence of the Dresselhaus spin orbit coupling, we can deconvolute this coupling from the spin splitting arising from axis-invariant Rashba spin-orbit coupling. We find that the Dresselhaus parameter is robust against an external gate bias and small changes in growth conditions, with an associated Dresselhaus parameter of (0.20±0.08)×10^-11 eVm being measured across all samples and top gate bias conditions. In addition, we show that the asymmetries associated with the coupled quantum well structure, leading to Rashba spin-orbit coupling, are likely to play a dominant role in determining the spin-orbit interaction experienced by a quantum spin Hall state as the system is tuned towards charge neutrality.

Keywords: Spin-Orbit Coupling, InAs/GaSb, Quantum Wells
Subjects: F000 - Physical sciences > F300 - Physics > F320 - Chemical physics > F321 - Solid-state physics
Divisions: Faculty of Engineering > School of Electronic and Electrical Engineering
Faculty of Mathematics and Physical Sciences > School of Physics and Astronomy
Related resources:
LocationType
https://doi.org/10.1103/PhysRevB.98.155323Publication
http://eprints.whiterose.ac.uk/138072/Publication
License: Creative Commons Attribution 4.0 International (CC BY 4.0)
Date deposited: 25 Oct 2018 07:32
URI: https://archive.researchdata.leeds.ac.uk/id/eprint/441

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