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Spin-orbit coupling plays an important role in condensed matter physics. It is conventionally viewed as a single-electron property inherited from the Dirac equation but not directly related to many-body interactions. In this talk, we propose a conceptually new mechanism for the spontaneous generation of spin-orbit coupling from unconventional type of magnetic phase transitions (e.g. p-wave) based on itinerant Fermi surface instabilities. The ordered phases are classified into two classes, dubbed the alpha and beta-phases by analogy to the superfluid He-3 A and B phases, respectively. The Fermi surfaces in the alpha phases exhibit spontaneous anisotropic distortions, which are the electronic nematic phases augmented by the spin degree of freedom. The beta-phases remain isotropic and develop nontrivial spin-texture configurations in momentum space – exhibiting various types of spin-orbit coupling. Possible directions for experimentally realizing these phases in transition metal oxides and rare earth compounds, and detections including neutron scattering and optical methods are discussed. We have also systematically developed Fermi liquid theory with spin-orbit coupled but inversion invariant systems, and applied it to Fermi systems characterized by magnetic dipolar interactions. An exotic propagating collective mode is identified as spin-orbit coupled Fermi surface oscillations.
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【直播】【ICQD月度论坛】西湖大学吴从军教授 学术报告
Unconventional Magnetism and Spontaneous Spin-orbit Ordering
2021年11月19日 15:30
直播二维码
报告人：
吴从军 | 西湖大学
主办方：
合肥微尺度物质科学国家研究中心、 国际功能材料量子设计中心（ICQD）
报告人简介
报告摘要
Spin-orbit coupling plays an important role in condensed matter physics. It is conventionally viewed as a single-electron property inherited from the Dirac equation but not directly related to many-body interactions. In this talk, we propose a conceptually new mechanism for the spontaneous generation of spin-orbit coupling from unconventional type of magnetic phase transitions (e.g. p-wave) based on itinerant Fermi surface instabilities. The ordered phases are classified into two classes, dubbed the alpha and beta-phases by analogy to the superfluid He-3 A and B phases, respectively. The Fermi surfaces in the alpha phases exhibit spontaneous anisotropic distortions, which are the electronic nematic phases augmented by the spin degree of freedom. The beta-phases remain isotropic and develop nontrivial spin-texture configurations in momentum space – exhibiting various types of spin-orbit coupling. Possible directions for experimentally realizing these phases in transition metal oxides and rare earth compounds, and detections including neutron scattering and optical methods are discussed. We have also systematically developed Fermi liquid theory with spin-orbit coupled but inversion invariant systems, and applied it to Fermi systems characterized by magnetic dipolar interactions. An exotic propagating collective mode is identified as spin-orbit coupled Fermi surface oscillations.
编辑：黄琦
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