Revealing the biexciton and trion-exciton complexes in BN encapsulated WSe2
Journal Article
·
· Nature Communications
- Rensselaer Polytechnic Inst., Troy, NY (United States); Shanghai Jiao Tong Univ. (China); None
- 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)
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.
- Research Organization:
- Florida State Univ., Tallahassee, FL (United States); Rensselaer Polytechnic Inst., Troy, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- FG02-07ER46451; SC0002623
- OSTI ID:
- 1511701
- Journal Information:
- Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 9; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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