Mean-field study of correlation-induced antisymmetric spin-orbit coupling in a two-orbital honeycomb model

• Hayami, Satoru

• Kusunose, Hiroaki

• Motome, Yukitoshi

抄録

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.

収録刊行物

• Physica B : Condensed Matter

  Physica B : Condensed Matter 536 649-653, 2018-05-01

  Elsevier

キーワード

• Spin-orbit coupling
• Multipole
• Spatial inversion symmetry breaking
• Spin and valley splittings
• Magnetoelectric effect
• Transition metal dichalcogenides and trichalcogenides

詳細情報

• CRID: 1050285299745601152
• NII論文ID: 120006842185
• DOI: 10.1016/j.physb.2017.08.063
• HANDLE: 2115/77802
• ISSN: 09214526
• Web Site: https://api.elsevier.com/content/article/PII:S0921452617305501?httpAccept=text/xml
• Web Site: https://api.elsevier.com/content/article/PII:S0921452617305501?httpAccept=text/plain
• 本文言語コード: en
• 資料種別: journal article
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