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 MaterialsInvited Live Streamed
|
Hide Abstracts |
Sponsoring Units: DCMP DMP Chair: David Cobden, University of Washington Room: McCormick Place W-375C |
Thursday, March 17, 2022 11:30AM - 12:06PM |
T44.00001: Enhanced photovoltaic effect in symmetry-engineered van der Waals nanostructures Invited Speaker: Toshiya Ideue Second-order nonlinear transport, which is the intrinsic rectification effect reflecting the symmetry breaking in solids, has been recently recognized as not only a unique functionality of noncentrosymmetric systems but also a sophisticated probe of band geometry/topology [1]. |
Thursday, March 17, 2022 12:06PM - 12:42PM |
T44.00002: Shift and Ballistic Currents from First Principles Invited Speaker: Andrew M Rappe As the need for clean, safe, and sustainable energy increases, renewed focus on alternative energy sources such as photovoltaics and next-generation computing have become vital. This motivates study of the bulk photovoltaic effect (BPVE), a nonlinear optoelectronic property that can generate electricity without a p-n junction. To demonstrate the capability of first-principles BPVE theories to guide materials design, we outline an automated method to design distortions that enhance the shift current of monolayer MoS2 and use it to uncover a polar distortion that increases the integrated shift current more than ten-fold. Because the distortion can be driven by a static electric field via the converse piezoelectric effect, this finding shows that electric fields can be used to engineer the shift current response of a material and complements previous work showing that mechanical strain can also modulate the shift current response. |
Thursday, March 17, 2022 12:42PM - 1:18PM |
T44.00003: Nonlinear quantum geometric responses in topological materials Invited Speaker: Suyang Xu
|
Thursday, March 17, 2022 1:18PM - 1:54PM |
T44.00004: Novel in-gap bulk current rectification mechanisms Invited Speaker: Inti A Sodemann We develop a unified formalism for current rectification processes of electronic Bloch bands in response to oscillatory electric fields that accounts microscopically for relaxation processes by including the coupling to a physical heat bath. This allows us to describe the impact of inelastic energy relaxation processes on intra-band phenomena such as the non-linear Hall effect and on inter-band phenomena such as shift and injection current effects. Moreover, we describe the conditions under which these effects survive even when the frequency of the impinging radiation is inside the optical absorption band-gap and discuss when these effects are allowed to produce a rectified current and perform work on an external circuit without violating the fundamental laws of thermodynamics. These considerations will allow us to uncover novel facet of the non-linear Hall effect as an efficient amplifier of circularly polarized light. |
Thursday, March 17, 2022 1:54PM - 2:30PM |
T44.00005: Nonlocal optoelectronics in topological semimetals Invited Speaker: Zhurun Ji Quantum materials – especially electronic materials that can source, detect and control light, promise to spark the next technological revolution. Recently, light-matter interactions in topological materials have attracted enormous research interest, with a major aim towards characterizing their electronic properties by exotic optical phenomena and advancing their applications in quantum devices. However, the existing optical probes have many limitations, and new techniques need to be continuously developed to uncover and utilize the quantum beauty lurking in these materials. In this talk, we will discuss our recent efforts introducing "nonlocality" into optoelectronics, and our discoveries including the spatially dispersive circular photogalvanic effect, orbital photogalvanic effect and opto-twistronic responses. By combining perspectives and approaches across quantum kinetic theory, band theory calculations and our newly developed state-of-the-art angle resolved photocurrent spectroscopy, we systemically explore the unique optical signatures of topological semimetals. We will also discuss how those discoveries would open a new venue for realizing phase-sensitive photodetection utilizing quantum materials, and their implications for the next quantum renovation. |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700