Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session M09: Characterization of Non-Moiré Graphene Devices
8:00 AM–11:00 AM,
Wednesday, March 6, 2024
Room: L100J
Sponsoring
Unit:
DCMP
Chair: Zhengguang Lu, Massachusetts Institute of Technology
Abstract: M09.00004 : Imaging electrostatic potential profiles induced by a patterned gate in the quantum Hall regime*
8:36 AM–8:48 AM
Presenter:
Haotan Han
(Princeton University)
Authors:
Haotan Han
(Princeton University)
Cheng-Li Chiu
(Princeton University)
Jiachen Yu
(Princeton University)
Hari Stoyanov
(University of California, Santa Barbara)
Liam A Cohen
(University of California, Santa Barbara)
Yongjoon Choi
(University of California, Santa Barbara)
Kenji Watanabe
(National Institute for Materials Science)
Takashi Taniguchi
(Kyoto Univ)
Andrea F Young
(University of California, Santa Barbara)
Ali Yazdani
(Princeton University)
robust integer and fractional quantum Hall effect. Although such quantum Hall states in graphene
systems have been intensively studied through multiple experimental probes, the technique of
isolating and trapping of the exotic quasiparticles in the quantum Hall regime is still lacking. Here,
we use AFM-based etching to pattern an array of holes in a few-layer graphite flake, which serves
as a bottom gate of a monolayer graphene. With an additional un-patterned graphite bottom gate,
we are able to realize an electrostatic potential well around the hole area in the monolayer
graphene. By performing STM measurements on the graphene layer, we can quantify the real-
space electrostatic potential distribution of the tunable potential well. Our experiment shows a
promising method to image trapped particles and quasiparticles in highly tunable graphene devices
and might pave the way for observation and manipulation of anyons.
*This work is supported by ONR, MURI, ARO-MURI, NSF-DMR.
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