Observation of the Interlayer Exciton Gases in WSe2 -p:WSe2 Heterostructures
Abstract
Interlayer excitons (IXs) possess a much longer lifetime than intralayer excitons due to the spatial separation of the electrons and holes, and hence they have been pursued to create exciton condensates for decades. The recent emergence of 2D materials, such as transition-metal dichalcogenides (TMDs), and of their van der Waals heterostructures, in which two different 2D materials are layered together, has created new opportunities to study IXs. Here we present the observation of IX gases within two stacked structures consisting of hBN/WSe2/hBN/p:WSe2/hBN. The IX energies of the two different structures differed by 82 meV due to the different thicknesses of the hexagonal boron nitride spacer layer between the TMD layers. We demonstrate that the lifetime of the IXs is shortened when the temperature and the pump power increase. We attribute this nonlinear behavior to an Auger process.
- Authors:
-
[1];
[3];
[3];
- Univ. of Pittsburgh, PA (United States). Dept. of Physics and Astronomy
- Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Physics
- National Institute for Materials Science (NIMS), Tsukuba (Japan)
- Publication Date:
- Research Org.:
- Carnegie Mellon Univ., Pittsburgh, PA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1803250
- Grant/Contract Number:
- SC0018115
- Resource Type:
- Accepted Manuscript
- Journal Name:
- ACS Photonics
- Additional Journal Information:
- Journal Volume: 7; Journal Issue: 7; Journal ID: ISSN 2330-4022
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; interlayer excitons; homobilayers; thermal distribution; Auger process; lifetime
Citation Formats
Sun, Zheng, Beaumariage, Jonathan, Cao, Qingrui, Watanabe, Kenji, Taniguchi, Takashi, Hunt, Benjamin Matthew, and Snoke, David. Observation of the Interlayer Exciton Gases in WSe2 -p:WSe2 Heterostructures. United States: N. p., 2020.
Web. doi:10.1021/acsphotonics.0c00476.
Sun, Zheng, Beaumariage, Jonathan, Cao, Qingrui, Watanabe, Kenji, Taniguchi, Takashi, Hunt, Benjamin Matthew, & Snoke, David. Observation of the Interlayer Exciton Gases in WSe2 -p:WSe2 Heterostructures. United States. https://doi.org/10.1021/acsphotonics.0c00476
Sun, Zheng, Beaumariage, Jonathan, Cao, Qingrui, Watanabe, Kenji, Taniguchi, Takashi, Hunt, Benjamin Matthew, and Snoke, David. Mon .
"Observation of the Interlayer Exciton Gases in WSe2 -p:WSe2 Heterostructures". United States. https://doi.org/10.1021/acsphotonics.0c00476. https://www.osti.gov/servlets/purl/1803250.
@article{osti_1803250,
title = {Observation of the Interlayer Exciton Gases in WSe2 -p:WSe2 Heterostructures},
author = {Sun, Zheng and Beaumariage, Jonathan and Cao, Qingrui and Watanabe, Kenji and Taniguchi, Takashi and Hunt, Benjamin Matthew and Snoke, David},
abstractNote = {Interlayer excitons (IXs) possess a much longer lifetime than intralayer excitons due to the spatial separation of the electrons and holes, and hence they have been pursued to create exciton condensates for decades. The recent emergence of 2D materials, such as transition-metal dichalcogenides (TMDs), and of their van der Waals heterostructures, in which two different 2D materials are layered together, has created new opportunities to study IXs. Here we present the observation of IX gases within two stacked structures consisting of hBN/WSe2/hBN/p:WSe2/hBN. The IX energies of the two different structures differed by 82 meV due to the different thicknesses of the hexagonal boron nitride spacer layer between the TMD layers. We demonstrate that the lifetime of the IXs is shortened when the temperature and the pump power increase. We attribute this nonlinear behavior to an Auger process.},
doi = {10.1021/acsphotonics.0c00476},
journal = {ACS Photonics},
number = 7,
volume = 7,
place = {United States},
year = {Mon Jun 22 00:00:00 EDT 2020},
month = {Mon Jun 22 00:00:00 EDT 2020}
}
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