Moiré potential impedes interlayer exciton diffusion in van der Waals heterostructures
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- Department of Physics, Complex Quantum Systems, and Texas Materials Institute, The University of Texas at Austin, Austin, TX 78712, USA.
- Department of Electrophysics, National Chiao Tung University, Hsinchu 30010, Taiwan.
- Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan.
- Department of Physics, Complex Quantum Systems, and Texas Materials Institute, The University of Texas at Austin, Austin, TX 78712, USA., Department of Physics, National Tsing-Hua University, Hsinchu 30013, Taiwan., Research Center for Applied Sciences, Academia Sinica, Nankang, Taipei 11529, Taiwan.
- National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
- Department of Physics, National Tsing-Hua University, Hsinchu 30013, Taiwan., Research Center for Applied Sciences, Academia Sinica, Nankang, Taipei 11529, Taiwan.
- Department of Photonics and Nanoelectronics, Hanyang University, Ansan 15588, Republic of Korea.
- Department of Electrophysics, National Chiao Tung University, Hsinchu 30010, Taiwan., Center for Emergent Functional Matter Science (CEFMS), National Chiao Tung University, Hsinchu 30010, Taiwan.
The properties of van der Waals heterostructures are drastically altered by a tunable moiré 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 moiré crystal with a large supercell and deep potential, interlayer excitons may be completely localized. As the moiré 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 moiré 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.
- Research Organization:
- Univ. of Texas, Austin, TX (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- SC0019398
- OSTI ID:
- 1664585
- Alternate ID(s):
- OSTI ID: 1803788
- Journal Information:
- Science Advances, Journal Name: Science Advances Vol. 6 Journal Issue: 39; ISSN 2375-2548
- Publisher:
- American Association for the Advancement of Science (AAAS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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