Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session T44: Quantum Geometric Photocurrents in Topological van der Waals Materials
11:30 AM–2:30 PM,
Thursday, March 17, 2022
Room: McCormick Place W-375C
Sponsoring
Units:
DCMP DMP
Chair: David Cobden, University of Washington
Abstract: T44.00001 : Enhanced photovoltaic effect in symmetry-engineered van der Waals nanostructures
11:30 AM–12:06 PM
Presenter:
Toshiya Ideue
(University of Tokyo)
Author:
Toshiya Ideue
(University of Tokyo)
In this talk, I will especially focus on the second-order nonlinear transport induced by photoirradiation in symmetry-engineered van der Waals nanostructures [2,3]. The giant bulk photovoltaic effect, which indicates the emergence of photo-induced spontaneous current without conventional semiconductor p-n junction nor bias voltage, was observed in van der Waals nanostructures with reduced symmetry such as WS2 nanotubes [2] and WSe2/Black phosphorus heterointerfaces [3]. Observed characteristic behaviors of the bulk photovoltaic effect can be well interpreted by the shift current mechanism, which is a quantum geometric photocurrent originated from the shift of the wave packet under the light illumination.
The present results offer a simple and powerful guideline for controlling the symmetry and band geometry/topology of nanomaterials and also provide the concept of electronic polarization and resultant emergent physical properties in complex nanostructures.
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