Revealing the biexciton and trion-exciton complexes in BN encapsulated WSe2
Abstract
Strong Coulomb interactions in single-layer transition metal dichalcogenides (TMDs) result in the emergence of strongly bound excitons, trions, and biexcitons. These excitonic complexes possess the valley degree of freedom, which can be exploited for quantum optoelectronics. However, in contrast to the good understanding of the exciton and trion properties, the binding energy of the biexciton remains elusive, with theoretical calculations and experimental studies reporting discrepant results. In this work, we resolve the conflict by employing low-temperature photoluminescence spectroscopy to identify the biexciton state in BN-encapsulated single-layer WSe2. The biexciton state only exists in charge-neutral WSe2, which is realized through the control of efficient electrostatic gating. In the lightly electron-doped WSe2, one free electron binds to a biexciton and forms the trion–exciton complex. Improved understanding of the biexciton and trion–exciton complexes paves the way for exploiting the many-body physics in TMDs for novel optoelectronics applications.
- Authors:
-
- Rensselaer Polytechnic Inst., Troy, NY (United States); Shanghai Jiao Tong Univ. (China)
- Rensselaer Polytechnic Inst., Troy, NY (United States)
- Florida State Univ., Tallehassee, FL (United States); National High Magnetic Field Lab. (MagLab), Tallahassee, FL (United States)
- Univ. of California, Berkeley, CA (United States)
- Rensselaer Polytechnic Inst., Troy, NY (United States); Nanjing Univ. (China)
- National Inst. for Materials Science (NIMS), Tsukuba (Japan)
- National High Magnetic Field Lab. (MagLab), Tallahassee, FL (United States)
- Publication Date:
- Research Org.:
- Florida State Univ., Tallahassee, FL (United States); Rensselaer Polytechnic Inst., Troy, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1511701
- Grant/Contract Number:
- FG02-07ER46451; SC0002623
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Li, Zhipeng, Wang, Tianmeng, Lu, Zhengguang, Jin, Chenhao, Chen, Yanwen, Meng, Yuze, Lian, Zhen, Taniguchi, Takashi, Watanabe, Kenji, Zhang, Shengbai, Smirnov, Dmitry, and Shi, Su-Fei. Revealing the biexciton and trion-exciton complexes in BN encapsulated WSe2. United States: N. p., 2018.
Web. doi:10.1038/s41467-018-05863-5.
Li, Zhipeng, Wang, Tianmeng, Lu, Zhengguang, Jin, Chenhao, Chen, Yanwen, Meng, Yuze, Lian, Zhen, Taniguchi, Takashi, Watanabe, Kenji, Zhang, Shengbai, Smirnov, Dmitry, & Shi, Su-Fei. Revealing the biexciton and trion-exciton complexes in BN encapsulated WSe2. United States. https://doi.org/10.1038/s41467-018-05863-5
Li, Zhipeng, Wang, Tianmeng, Lu, Zhengguang, Jin, Chenhao, Chen, Yanwen, Meng, Yuze, Lian, Zhen, Taniguchi, Takashi, Watanabe, Kenji, Zhang, Shengbai, Smirnov, Dmitry, and Shi, Su-Fei. Thu .
"Revealing the biexciton and trion-exciton complexes in BN encapsulated WSe2". United States. https://doi.org/10.1038/s41467-018-05863-5. https://www.osti.gov/servlets/purl/1511701.
@article{osti_1511701,
title = {Revealing the biexciton and trion-exciton complexes in BN encapsulated WSe2},
author = {Li, Zhipeng and Wang, Tianmeng and Lu, Zhengguang and Jin, Chenhao and Chen, Yanwen and Meng, Yuze and Lian, Zhen and Taniguchi, Takashi and Watanabe, Kenji and Zhang, Shengbai and Smirnov, Dmitry and Shi, Su-Fei},
abstractNote = {Strong Coulomb interactions in single-layer transition metal dichalcogenides (TMDs) result in the emergence of strongly bound excitons, trions, and biexcitons. These excitonic complexes possess the valley degree of freedom, which can be exploited for quantum optoelectronics. However, in contrast to the good understanding of the exciton and trion properties, the binding energy of the biexciton remains elusive, with theoretical calculations and experimental studies reporting discrepant results. In this work, we resolve the conflict by employing low-temperature photoluminescence spectroscopy to identify the biexciton state in BN-encapsulated single-layer WSe2. The biexciton state only exists in charge-neutral WSe2, which is realized through the control of efficient electrostatic gating. In the lightly electron-doped WSe2, one free electron binds to a biexciton and forms the trion–exciton complex. Improved understanding of the biexciton and trion–exciton complexes paves the way for exploiting the many-body physics in TMDs for novel optoelectronics applications.},
doi = {10.1038/s41467-018-05863-5},
journal = {Nature Communications},
number = 1,
volume = 9,
place = {United States},
year = {Thu Sep 13 00:00:00 EDT 2018},
month = {Thu Sep 13 00:00:00 EDT 2018}
}
Web of Science
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