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Revealing the biexciton and trion-exciton complexes in BN encapsulated WSe.

Title: Revealing the biexciton and trion-exciton complexes in BN encapsulated WSe.
Name(s): Li, Zhipeng, author
Wang, Tianmeng, author
Lu, Zhengguang, author
Jin, Chenhao, author
Chen, Yanwen, author
Meng, Yuze, author
Lian, Zhen, author
Taniguchi, Takashi, author
Watanabe, Kenji, author
Zhang, Shengbai, author
Smirnov, Dmitry, author
Shi, Su-Fei, author
Type of Resource: text
Genre: Journal Article
Date Issued: 2018-09-13
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: 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 WSe. The biexciton state only exists in charge-neutral WSe, which is realized through the control of efficient electrostatic gating. In the lightly electron-doped WSe, 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.
Identifier: FSU_pmch_30213927 (IID), 10.1038/s41467-018-05863-5 (DOI), PMC6137082 (PMCID), 30213927 (RID), 30213927 (EID), 10.1038/s41467-018-05863-5 (PII)
Grant Number: JPMJCR15F3, JPMJCR15F3, FA9550-18-1-0312
Publication Note: This NIH-funded author manuscript originally appeared in PubMed Central at
Persistent Link to This Record:
Host Institution: FSU
Is Part Of: Nature communications.
Issue: iss. 1, vol. 9

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Li, Z., Wang, T., Lu, Z., Jin, C., Chen, Y., Meng, Y., … Shi, S. -F. (2018). Revealing the biexciton and trion-exciton complexes in BN encapsulated WSe. Nature Communications. Retrieved from