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 T00: Poster Session III (1pm-4pm PST)
1:00 PM,
Thursday, March 9, 2023
Room: Exhibit Hall (Forum Ballroom)
Sponsoring
Unit:
APS
Abstract: T00.00007 : Optical conductivity of a gated Topological Insulator with a THz-transparent gate
Presenter:
Craig S Knox
(University of Leeds)
Authors:
Craig S Knox
(University of Leeds)
Ahmet Yagmur
(University of Leeds)
Mark C Rosamond
(University of Leeds)
Satoshi Sasaki
(University of Leeds)
Edmund H Linfield
(University of Leeds)
Alexander G Davies
(University of Leeds)
Joshua R Freeman
(University of Leeds)
A 2D carrier gas will only ever partially screen an electric field from a gate, applied perpendicular to the 2D gas. Therefore, the presence of any 2DEG on the surface of a topological insulator will cause the bulk carriers to experience a smaller applied electric field than would otherwise be the case. This remains true even in the case where the carriers within the 2DEG do not significantly contribute to the DC transport. We have grown a Bi2Se3 topological insulator by molecular beam epitaxy and subsequently developed and deposited a THz-transparent top-gate stack in order to facilitate electrostatic gating of this topological insulator material. We will perform THz-TDS and DC transport measurements on this topological insulator field effect device in order to investigate the effect that an applied gate bias has on the carrier dynamics, with an aim to deconvolute the bulk and surface response in the optical conductivity spectrum.
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