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 B34: Optical Spectroscopic Measurements of 2D Materials II
11:30 AM–2:30 PM,
Monday, March 6, 2023
Room: Room 226/227
Sponsoring
Unit:
FIAP
Chair: Wei-Sheng Lee, SLAC - Natl Accelerator Lab
Abstract: B34.00001 : Quasi-1D Exciton Channels in Strain-Engineered 2D Materials
11:30 AM–11:42 AM
Presenter:
Florian Dirnberger
(Technical University of Dresden)
Authors:
Florian Dirnberger
(Technical University of Dresden)
Jonas D Ziegler
(University of Regensburg)
Vinod M Menon
(City College of New York)
Alexey Chernikov
(Technical University of Dresden)
Here, we demonstrate guiding of excitons along strain-engineered quasi-one-dimensional (1D) potential channels by combining mechanically flexible van der Waals heterostructures with single-crystal nanowires in hybrid 1D/2D systems [1]. Using ultrafast, all-optical injection and time-resolved readout, we realize highly directional exciton flow with up to 100% anisotropy both at cryogenic and room temperatures. The vanishing diffusion of excitons perpendicular to the channels highlights their efficient localization by confinement potentials and locally suppressed exciton-phonon scattering. Artificially inducing anisotropy in a pristine, otherwise fully 2D semiconductor is a promising, non-invasive approach to steering optical excitations along pre-determined pathways and opens a path towards rich quasiparticle transport phenomena in 1D.
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