Current-induced spin polarisation in Rashba–Dresselhaus systems under different point groups
Non-magnetic materials without inversion symmetry typically exhibit strong Rashba spin–orbit coupling (SOC), enabling the well-known Rashba Edelstein effect where an external electrical current induces transverse spin polarisation. In this study, we demonstrate that electrically induced spin polaris...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2025-01-01
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| Series: | New Journal of Physics |
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| Online Access: | https://doi.org/10.1088/1367-2630/adac88 |
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| author | Akash Dey Ashis K Nandy Kush Saha |
| author_facet | Akash Dey Ashis K Nandy Kush Saha |
| author_sort | Akash Dey |
| collection | DOAJ |
| description | Non-magnetic materials without inversion symmetry typically exhibit strong Rashba spin–orbit coupling (SOC), enabling the well-known Rashba Edelstein effect where an external electrical current induces transverse spin polarisation. In this study, we demonstrate that electrically induced spin polarisation in non-magnetic materials, for example, electronic systems within quantum-well geometries, can significantly be influenced by the system’s point-group symmetries, such as C _n and C _nv . These symmetries allow various linear and higher-order momentum, $k-$ varying SOC Hamiltonian. Specifically, we show that surfaces having C _n point-group symmetry, which permits specific linear and cubic Rashba and Dresselhaus SOC terms, can lead to both orthogonal and non-orthogonal spin polarisations with respect to the applied field. In contrast, surfaces with C _nv symmetry exhibit only transverse spin polarisation, regardless of the linear and cubic SOC terms. We further find contrasting spin polarisation for cubic-in- k SOC as compared to the linear-in- k SOC when energy is varied, for example, through doping. Additionally, we show that the surfaces with C _n symmetry may exhibit persistent spin current, depending on the relative strength between different momentum-dependent SOC terms. Our finding emphasizes the significance of crystal symmetry in understanding and manipulating induced spin polarisation in noncentrosymmetric materials, especially in surface/interface systems. |
| format | Article |
| id | doaj-art-069674d6aa6044319253605896053a48 |
| institution | Kabale University |
| issn | 1367-2630 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | New Journal of Physics |
| spelling | doaj-art-069674d6aa6044319253605896053a482025-01-30T13:13:06ZengIOP PublishingNew Journal of Physics1367-26302025-01-0127101302410.1088/1367-2630/adac88Current-induced spin polarisation in Rashba–Dresselhaus systems under different point groupsAkash Dey0https://orcid.org/0009-0004-2089-7553Ashis K Nandy1https://orcid.org/0000-0002-9296-2535Kush Saha2https://orcid.org/0000-0001-9578-8897National Institute of Science Education and Research , Jatni, Odisha 752050, India; Homi Bhabha National Institute , Training School Complex, Anushakti Nagar, Mumbai 400094, IndiaNational Institute of Science Education and Research , Jatni, Odisha 752050, India; Homi Bhabha National Institute , Training School Complex, Anushakti Nagar, Mumbai 400094, IndiaNational Institute of Science Education and Research , Jatni, Odisha 752050, India; Homi Bhabha National Institute , Training School Complex, Anushakti Nagar, Mumbai 400094, IndiaNon-magnetic materials without inversion symmetry typically exhibit strong Rashba spin–orbit coupling (SOC), enabling the well-known Rashba Edelstein effect where an external electrical current induces transverse spin polarisation. In this study, we demonstrate that electrically induced spin polarisation in non-magnetic materials, for example, electronic systems within quantum-well geometries, can significantly be influenced by the system’s point-group symmetries, such as C _n and C _nv . These symmetries allow various linear and higher-order momentum, $k-$ varying SOC Hamiltonian. Specifically, we show that surfaces having C _n point-group symmetry, which permits specific linear and cubic Rashba and Dresselhaus SOC terms, can lead to both orthogonal and non-orthogonal spin polarisations with respect to the applied field. In contrast, surfaces with C _nv symmetry exhibit only transverse spin polarisation, regardless of the linear and cubic SOC terms. We further find contrasting spin polarisation for cubic-in- k SOC as compared to the linear-in- k SOC when energy is varied, for example, through doping. Additionally, we show that the surfaces with C _n symmetry may exhibit persistent spin current, depending on the relative strength between different momentum-dependent SOC terms. Our finding emphasizes the significance of crystal symmetry in understanding and manipulating induced spin polarisation in noncentrosymmetric materials, especially in surface/interface systems.https://doi.org/10.1088/1367-2630/adac882D electron gasRashba and Dresselhaus spin–orbit couplingEdelstein effectpersistent spin texture |
| spellingShingle | Akash Dey Ashis K Nandy Kush Saha Current-induced spin polarisation in Rashba–Dresselhaus systems under different point groups New Journal of Physics 2D electron gas Rashba and Dresselhaus spin–orbit coupling Edelstein effect persistent spin texture |
| title | Current-induced spin polarisation in Rashba–Dresselhaus systems under different point groups |
| title_full | Current-induced spin polarisation in Rashba–Dresselhaus systems under different point groups |
| title_fullStr | Current-induced spin polarisation in Rashba–Dresselhaus systems under different point groups |
| title_full_unstemmed | Current-induced spin polarisation in Rashba–Dresselhaus systems under different point groups |
| title_short | Current-induced spin polarisation in Rashba–Dresselhaus systems under different point groups |
| title_sort | current induced spin polarisation in rashba dresselhaus systems under different point groups |
| topic | 2D electron gas Rashba and Dresselhaus spin–orbit coupling Edelstein effect persistent spin texture |
| url | https://doi.org/10.1088/1367-2630/adac88 |
| work_keys_str_mv | AT akashdey currentinducedspinpolarisationinrashbadresselhaussystemsunderdifferentpointgroups AT ashisknandy currentinducedspinpolarisationinrashbadresselhaussystemsunderdifferentpointgroups AT kushsaha currentinducedspinpolarisationinrashbadresselhaussystemsunderdifferentpointgroups |