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Title: Tunable spin and orbital polarization in SrTiO3-based heterostructures
Authors: Ho, C.S. 
Kong, W.
Yang, M.
Rusydi, A.
Jalil, M.B.A. 
Keywords: k.p method
oxides interface
Rashba splitting
Issue Date: 2019
Publisher: Institute of Physics Publishing
Citation: Ho, C.S., Kong, W., Yang, M., Rusydi, A., Jalil, M.B.A. (2019). Tunable spin and orbital polarization in SrTiO3-based heterostructures. New Journal of Physics 21 (10) : 103016. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: We formulate the effective Hamiltonian of Rashba spin-orbit coupling (RSOC) in (LAO/STO) heterostructures. We derive analytical expressions of properties, e.g. Rashba parameter, effective mass, band edge energy and orbital occupancy, as functions of material and tunable heterostructure parameters. While linear RSOC is dominant around the ?-point, cubic RSOC becomes significant at the higher-energy anti-crossing region. We find that linear RSOC stems from the structural inversion asymmetry (SIA), while the cubic term is induced by both SIA and bulk asymmetry. Furthermore, the SOC strength shows a striking dependence on the tunable heterostructure parameters such as STO thickness and the interfacial electric field which is ascribed to the quantum confinement effect near the LAO/STO interface. The calculated values of the linear and cubic RSOC are in agreement with previous experimental results. © 2019 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft.
Source Title: New Journal of Physics
ISSN: 1367-2630
DOI: 10.1088/1367-2630/ab4735
Rights: Attribution 4.0 International
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