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Moire potential impedes interlayer exciton diffusion in van der Waals heterostructures

Title
Moire potential impedes interlayer exciton diffusion in van der Waals heterostructures
Author
김수은
Issue Date
2020-09
Publisher
AMER ASSOC ADVANCEMENT SCIENCE
Citation
SCIENCE ADVANCES, v. 6, no. 39, Article no. eaba8866, 6pp
Abstract
The properties of van der Waals heterostructures are drastically altered by a tunable moire superlattice arising from periodically varying atomic alignment between the layers. Exciton diffusion represents an important channel of energy transport in transition metal dichalcogenides (TMDs). While early studies performed on TMD heterobilayers suggested that carriers and excitons exhibit long diffusion, a rich variety of scenarios can exist. In a moire crystal with a large supercell and deep potential, interlayer excitons may be completely localized. As the moire period reduces at a larger twist angle, excitons can tunnel between supercells and diffuse over a longer lifetime. The diffusion should be the longest in commensurate heterostructures where the moire superlattice is completely absent. Here, we experimentally demonstrate the rich phenomena of interlayer exciton diffusion in WSe2/MoSe2 heterostructures by comparing several samples prepared with chemical vapor deposition and mechanical stacking with accurately controlled twist angles.
URI
https://advances.sciencemag.org/content/6/39/eaba8866https://repository.hanyang.ac.kr/handle/20.500.11754/164611
ISSN
2375-2548
DOI
10.1126/sciadv.aba8866
Appears in Collections:
COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > PHOTONICS AND NANOELECTRONICS(나노광전자학과) > Articles
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