Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session B14: Dirac and Weyl Semimetals: Theory I
11:30 AM–2:06 PM,
Monday, March 4, 2024
Room: M100E
Sponsoring
Unit:
DCMP
Chair: Vsevolod Ivanov, Virginia Tech
Abstract: B14.00010 : Shift current responses of a two-dimensional system approaching the Weyl semimetal phase*
1:18 PM–1:30 PM
Presenter:
Hiroki Yoshida
(Tokyo Institute of Technology, Tokyo)
Authors:
Hiroki Yoshida
(Tokyo Institute of Technology, Tokyo)
Shuichi Murakami
(Tokyo Institute of Technology, Tokyo)
Similar to the electric polarization, second-order nonlinear photocurrent responses are known to be in a close relationship with geometric quantities. Since Weyl points are singularities of geometric phases, they are expected to give nontrivial effects in optical responses as well. In this study, we focus on the shift current responses of two-dimensional systems and study their behavior in the limit where the energy gap of the system closes and the system approaches the Weyl semimetal phase. We show the relation between the shift current and Weyl points using a generic effective model of Weyl points.
[1] H. Yoshida, T. Zhang, and S. Murakami, Phys. Rev. B 107, 035122 (2023)
[2] H. Yoshida, T. Zhang, and S. Murakami, Phys. Rev. B 108, 075160 (2023)
*This work is supported by Japan Society for the Promotion of Science (JSPS) KAKENHI Grants No. JP22K18687 and No. JP22H00108. This work is also supported by JST SPRING, Grant Number JPMJSP2106.
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