Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session Q21: Confined Excitons
3:00 PM–5:48 PM,
Wednesday, March 8, 2023
Room: Room 213
Sponsoring
Unit:
DCMP
Chair: Daniel Rizzo, Columbia University
Abstract: Q21.00008 : Magneto-optic characterization of quaternion state in TMD bilayers with metallic screening*
4:24 PM–4:36 PM
Presenter:
Qiaochu Wan
(University of Pittsburgh)
Authors:
Qiaochu Wan
(University of Pittsburgh)
Jonathan C Beaumariage
(University of Pittsburgh)
Rui Xue
(University of Pittsburgh)
Li Xiang
(Florida State University)
Jessica Chisholm
(university of arizona)
Kenji Watanabe
(National Institute for Materials Science)
Takashi Taniguchi
(National Institute for Materials Science)
Igor V Bondarev
(North Carolina Central University)
Dmitry Smirnov
(National High Magnetic Field Laboratory)
David W Snoke
(University of Pittsburgh)
Zheng Sun
(State Key Laboratory of Precision Spectroscopy of East China Normal University)
We have measured the magnetic field dependence of the photoluminescence (PL) of these complexes. The magnetic field was applied in both out-of-plane directions from 0 to 14 Tesla, and the PL was measured in different circular polarized components of photoluminescence. The energy of the trions and excitons shift linearly with the magnetic field. In contrast, the energy of the quaternion shows a non-linear relationship with the magnetic field, which is also asymmetric with the direction of the magnetic field. The asymmetry is consistent with the fact that the quaternion state is asymmetric in the z-direction, as predicted by theory.
We are moving forward to put a top gate on these devices to allow continuous variation of the doping level. These metal-screened novel bound states are potentially charged bosons, which can even be a potential candidate for room-temperature and atmospheric-pressure superconductivity.
*This work is supported by the U.S. Army Research Office under Multidisciplinary University Research Initiative(MURI) award W911NF-17-1-0312.
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