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Mean-field study of correlation-induced antisymmetric spin-orbit coupling in a two-orbital honeycomb model
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| Title: | Mean-field study of correlation-induced antisymmetric spin-orbit coupling in a two-orbital honeycomb model |
| Authors: | Hayami, Satoru Browse this author | | Kusunose, Hiroaki Browse this author | | Motome, Yukitoshi Browse this author |
| Keywords: | Spin-orbit coupling | | Multipole | | Spatial inversion symmetry breaking | | Spin and valley splittings | | Magnetoelectric effect | | Transition metal dichalcogenides and trichalcogenides |
| Issue Date: | 1-May-2018 |
| Publisher: | Elsevier |
| Journal Title: | Physica B : Condensed Matter |
| Volume: | 536 |
| Start Page: | 649 |
| End Page: | 653 |
| Publisher DOI: | 10.1016/j.physb.2017.08.063 |
| Abstract: | We investigate a two-orbital Hubbard model on a honeycomb structure, with a special focus on the antisymmetric spin-orbit coupling (ASOC) induced by symmetry breaking in the electronic degrees of freedom. By investigating the ground-state phase diagram by the mean-field approximation in addition to the analysis in the strong correlation limit, we obtain a variety of symmetry-broken phases that induce different types of effective ASOCs by breaking of spatial inversion symmetry. We find several unusual properties emergent from the ASOCs, such as a linear magnetoelectric effect in a spin-orbital ordered phase at 1/4 filling and a spin splitting in the band structure in charge ordered phases at 1/4 and 1/2 fillings. We also show that a staggered potential on the honeycomb structure leads to another type of ASOC, which gives rise to a valley splitting in the band structure at 1/2 filling. We discuss the experimental relevance of our results to candidate materials including transition metal dichalcogenides and trichalcogenides. |
| Rights: | ©2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ | | http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/77802 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 速水 賢
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