Date: Mar. 27 (Mon), 2023, 16:00～17:00
Place: On Zoom
Speaker: Shintaro HOSHINO
Affiliation: Saitama University
Title： Spin-derived electric polarization and
chirality density inherent in localized electron orbitals
Abstract：
In solid state physics, any phase transition is commonly observed asa change in the microscopic distribution of charge, spin, or current.However, there is an exotic order parameter inherent in the localizedelectron orbitals that cannot be primarily captured by these threefundamental quantities. This order parameter is described as the electrictoroidal multipoles connecting different total angular momenta underthe spin-orbit coupling. The corresponding microscopic physicalquantity is the spin current tensor on an atomic scale, which inducesspin-derived electric polarization aligned circularly and the chiralitydensity derived from the Dirac equation [1]. We also derive theequation of continuity for chirality density and discuss its relation tochiral anomaly and optical chirality. These findings link microscopicspin currents and chirality in the Dirac theory to the concept ofmultipoles and provide a new perspective for quantum states of matter.This work has been done in collaboration with H. Ikeda and M.-T. Suzuki.[1] S. Hoshino, M.-T. Suzuki, H. Ikeda, arXiv:2210.02148 (2022).
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