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 W21: Non-carbon Nanostructures
3:00 PM–6:00 PM,
Thursday, March 9, 2023
Room: Room 213
Sponsoring
Unit:
DCMP
Chair: Serkan Caliskan, University of Houston - Clear Lake
Abstract: W21.00002 : Gated quantum structures in monolayer WSe2*
3:12 PM–3:24 PM
Presenter:
Justin Boddison-Chouinard
(University of Ottawa)
Authors:
Justin Boddison-Chouinard
(University of Ottawa)
Alexander M Bogan
(National Research Council Canada)
Norman Fong
(National Research Council Canada)
Pedro Barios
(National Research Council Canada)
Jean Lapointe
(National Research Council Canada)
Kenji Watanabe
(National Institute for Materials Science)
Takashi Taniguchi
(National Institute for Materials Science)
Jaroslaw Pawlowski
(Wroclaw University of Science and Technology)
Daniel Miravet
(University of Ottawa)
Maciej Bieniek
(Wurzburg University)
Pawel Hawrylak
(University of Ottawa)
Adina A Luican-Mayer
(University of Ottawa)
Louis Gaudreau
(National Research Council Canada)
We first present the fabrication of the devices used in this work and demonstrate that high quality contacts are achievable. We then demonstrate that our gate architecture allows us to identify and control quantum dots that have formed in the local minima of electrostatic potential fluctuations in the WSe2 sheet. Coulomb blockade peaks and diamonds are observed which allow us to extract information about the dot diameter and its charging energy1. Using this gate architecture, we also demonstrate that a nanoconstriction defined in the monolayer WSe2 flake can be used as a charge detector for nearby quantum dots with sensitivities comparable to that of other charge detectors based on graphene2. Finally, we present transport measurements related to a gate-defined 1D channel in monolayer WSe2. In the quasi-ballistic regime of our high mobility sample, we report conductance quantization steps in units of e2/h that remain constant for a large range of applied magnetic fields, indicating the lifting of the spin and valley degeneracies in this system3.
These results bring us closer to achieving functional quantum devices based on electrostatic confinement in semiconducting TMDs and improve our understanding of their electronic properties.
*This work was supported by the High Throughput and Secure Networks Challenge Program and the Quantum Sensors Challenge Program at the National Research Council of Canada. This research was supported by NSERC QC2DM Strategic Grant No. STPG-521420, NSERC Discovery Grant No. RGPIN- 2019-05714, and University of Ottawa Research Chair in Quantum Theory of Quantum Materials, Nanostructures, and Devices.
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