Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session S23: Electronic structure of topological materials (photoemission, etc.)-III
8:00 AM–11:00 AM,
Thursday, March 9, 2023
Room: Room 215
Sponsoring
Unit:
DCMP
Chair: Muhammad Shattique, University of California, Merced
Abstract: S23.00010 : In-situ control of topological phase transitions in Cd3As2 detected via the circular photogalvanic effect*
9:48 AM–10:00 AM
Presenter:
Bob M Wang
(University of California, Davis)
Authors:
Bob M Wang
(University of California, Davis)
Dong Yu
(University of California, Davis)
Henry C Travaglini
(University of California, Davis)
Yuqing Zhu
(University of California, Davis)
Sergey Y Savrasov
(University of California, Davis)
Collaboration:
N/A
Spin injection via circularly polarized light is a nonintrusive and efficient method of utilizing spin properties in quantum device and spintronics applications and can be accomplished by an assortment of mechanisms, including the circular photogalvanic effect (CPGE). CPGE induced helicity dependent photocurrent modulation requires broken inversion symmetry, and thus can be used to probe topological phase transitions as the modulation is switched on and off. Recently, a local transition from Dirac semimetal to topological insulator was reported in Cd3As2 near the vicinity of the metal-semimetal interface, where a strong in-plane Schottky field locally breaks inversion symmetry. Using scanning photocurrent microscopy, we further explore means of controlling phase transitions in-situ via liquid ion top gating, strain, and doping.
* This work was supported by the U.S. National Science Foundation Grant DMR-2105161 and DMR-1832728. Device fabrication was partially carried out at the Molecular Foundry, which is funded by the Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. Part of this study was carried out at the UC Davis Center for Nano and Micro Manufacturing (CNM2).
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