Tunable spin and orbital polarization in SrTiO3-based heterostructures
We formulate the effective Hamiltonian of Rashba spin–orbit coupling (RSOC) in ${\mathrm{LaAlO}}_{3}/{\mathrm{SrTiO}}_{3}$ (LAO/STO) heterostructures. We derive analytical expressions of properties, e.g. Rashba parameter, effective mass, band edge energy and orbital occupancy, as functions of materi...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2019-01-01
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| Series: | New Journal of Physics |
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| Online Access: | https://doi.org/10.1088/1367-2630/ab4735 |
| _version_ | 1797750392747982848 |
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| author | Cong Son Ho Weilong Kong Ming Yang Andrivo Rusydi Mansoor B A Jalil |
| author_facet | Cong Son Ho Weilong Kong Ming Yang Andrivo Rusydi Mansoor B A Jalil |
| author_sort | Cong Son Ho |
| collection | DOAJ |
| description | We formulate the effective Hamiltonian of Rashba spin–orbit coupling (RSOC) in ${\mathrm{LaAlO}}_{3}/{\mathrm{SrTiO}}_{3}$ (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 Γ-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. |
| first_indexed | 2024-03-12T16:33:07Z |
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| id | doaj.art-124203d7bee44e3cbdb2c7b431437709 |
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| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:33:07Z |
| publishDate | 2019-01-01 |
| publisher | IOP Publishing |
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| series | New Journal of Physics |
| spelling | doaj.art-124203d7bee44e3cbdb2c7b4314377092023-08-08T15:24:15ZengIOP PublishingNew Journal of Physics1367-26302019-01-01211010301610.1088/1367-2630/ab4735Tunable spin and orbital polarization in SrTiO3-based heterostructuresCong Son Ho0https://orcid.org/0000-0002-5608-0113Weilong Kong1Ming Yang2Andrivo Rusydi3Mansoor B A Jalil4Department of Electrical and Computer Engineering, National University of Singapore , 4 Engineering Drive 3, 117576, SingaporeDepartment of Physics, Faculty of Science 2 Science Drive 3 Blk S12, Level 2 117551, SingaporeInstitute of Materials Research and Engineering, 2 Fusionopolis Way, Innovis, 138634, SingaporeDepartment of Physics, Faculty of Science 2 Science Drive 3 Blk S12, Level 2 117551, SingaporeDepartment of Electrical and Computer Engineering, National University of Singapore , 4 Engineering Drive 3, 117576, SingaporeWe formulate the effective Hamiltonian of Rashba spin–orbit coupling (RSOC) in ${\mathrm{LaAlO}}_{3}/{\mathrm{SrTiO}}_{3}$ (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 Γ-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.https://doi.org/10.1088/1367-2630/ab4735Rashba splittingoxides interfacek.p methodmulti-orbital |
| spellingShingle | Cong Son Ho Weilong Kong Ming Yang Andrivo Rusydi Mansoor B A Jalil Tunable spin and orbital polarization in SrTiO3-based heterostructures New Journal of Physics Rashba splitting oxides interface k.p method multi-orbital |
| title | Tunable spin and orbital polarization in SrTiO3-based heterostructures |
| title_full | Tunable spin and orbital polarization in SrTiO3-based heterostructures |
| title_fullStr | Tunable spin and orbital polarization in SrTiO3-based heterostructures |
| title_full_unstemmed | Tunable spin and orbital polarization in SrTiO3-based heterostructures |
| title_short | Tunable spin and orbital polarization in SrTiO3-based heterostructures |
| title_sort | tunable spin and orbital polarization in srtio3 based heterostructures |
| topic | Rashba splitting oxides interface k.p method multi-orbital |
| url | https://doi.org/10.1088/1367-2630/ab4735 |
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