Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session K12: Optics in 2D Materials: Part III
3:00 PM–6:00 PM,
Tuesday, March 5, 2024
Room: M100C
Sponsoring
Unit:
FIAP
Chair: Zachary Robinson, SUNY Brockport
Abstract: K12.00015 : Emergent excitons in super-twisted spiral transition metal dichalcogenide*
5:48 PM–6:00 PM
Presenter:
Yinan Dong
(Columbia University)
Authors:
Yinan Dong
(Columbia University)
Yuzhou Zhao
(University of Washington)
Lennart Klebl
(RWTH Aachen University)
Taketo Handa
(Columbia University)
Thomas P Darlington
(Columbia University)
Kevin W Kwock
(Columbia University)
Chennan He
(columbia university)
Yusong Bai
(Brown University)
Raquel Queiroz
(Columbia University)
Xiaoyang Zhu
(Columbia University)
James Schuck
(Columbia University)
Xiaodong Xu
(University of Washington)
Song Jin
(University of Wisconsin–Madison)
Dmitri N Basov
(Columbia University)
The hundred-nanometer thick super-twisted WS2 are directly grown by chemical vapor deposition utilizing screw dislocations and non-Euclidean substrate geometry. The high crystal quality is proven by real-space imaging of waveguide modes and their large quality factors by scattering-type scanning nearfield microscopy. The super-twisted spirals bring about a new collection of symmetries observed by second-harmonic generation mapping. Most importantly, by measuring temperature-dependent photoluminescence, emergent long-wavelength excitonic peaks are uncovered under 160 K with comparable intensity with A excitons. The position and strength of these peaks are dependent on super-twist angles and absent on non-twisted spirals. The formation of these excitons is inherited from the drastically modified band structure by 3D super-twisting, supported by tight-binding calculations.
*LK acknowledges support from the DFG through FOR 5249 (QUAST, Project No. 449872909) and computing time granted through JARA on the supercomputer JURECA at Forschungszentrum Jülich.
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