Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session T00: Poster Session III (1pm-4pm PST)
1:00 PM,
Thursday, March 9, 2023
Room: Exhibit Hall (Forum Ballroom)
Sponsoring
Unit:
APS
Abstract: T00.00203 : Chirality-dependent second-order spin current in systems with time-reversal symmetry
Presenter:
Ryosuke Hirakida
(University of Tokyo)
Authors:
Ryosuke Hirakida
(University of Tokyo)
Masao Ogata
(Univ of Tokyo)
Although the theory of CISS in organic materials has been intensively studied, it in inorganic materials remains to be explored. Since CISS is observed in the paramagnetic phase of CrNb3S6, spin polarization occurs in systems with time-reversal symmetry. However, it is known that a single-channel system with time-reversal symmetry does not produce a spin current linear in the electric field. This theorem makes the construction of the CISS theory difficult.
In this study, we constructed a chiral tight-binding model with time-reversal symmetry and evaluate its spin current. Specifically, we constructed a tight-binding model with chiral hopping and spin-orbit coupling and numerically calculated the spin currents proportional to the first and second orders of the electric field. As a result, it was found that the first-order spin current vanishes, while the second-order spin current can be finite. Furthermore, the sign of the second-order spin current can be reversed by switching the chirality of the model.
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