Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session B57: 2D Semiconductors: Optical Spectroscopy
11:15 AM–2:03 PM,
Monday, March 2, 2020
Room: Mile High Ballroom 3A
Sponsoring
Units:
DMP DCOMP
Chair: Hanan Dery
Abstract: B57.00008 : Tunable Spontaneous Valley Coherence in Atomically Thin Semiconductors
View Presentation Abstract
Presenter:
Mandar Sohoni
(Physics, Indian Institute of Technology, Bombay)
Authors:
Mandar Sohoni
(Physics, Indian Institute of Technology, Bombay)
Muralidhar Nalabothula
(Physics, Indian Institute of Technology, Bombay)
Pankaj Jha
(Applied Physics and Material Science, Calinfornia Institure of Technology)
Tony Low
(Electrical & Computer Engineering, University of Minnesota)
ANSHUMAN KUMAR
(Physics, Indian Institute of Technology, Bombay)
In this work we study the spontaneous valley coherence generated in a van der Waals heterostructure created by combining a TMDC with other two dimensional (2D) materials. First, we discuss general results on exploring the parameter space of the optical conductivity tensor of such a system to get the highest values of valley coherence and coherence times. Second, we analyze the spontaneously generated valley coherence for “hybrid” (a mixture of interlayer and intralyer) excitons in a system involving an anisotropic photonic metasurface and a TMDC heterostructure. We study the dependence of the coherence on external tuning knobs such as an electric field, and interlayer coupling in the heterostructure. Our analysis should help the community in designing heterostructures for maximum valley coherence, and help solidify the foundation of the valley degree of freedom as a qubit.
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