Research Data Leeds Repository
Dataset Associated with 'Deconvolution of Rashba and Dresselhaus spin-orbit coupling by crystal axis dependent measurements of coupled InAs/GaSb quantum wells'
Citation
Knox, Craig S. 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 | ||||||
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Subjects: | F000 - Physical sciences > F300 - Physics > F320 - Chemical physics > F321 - Solid-state physics | ||||||
Divisions: | Faculty of Engineering and Physical Sciences > School of Electronic and Electrical Engineering Faculty of Engineering and Physical Sciences > School of Physics and Astronomy |
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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 | ||||||