Revealing the biexciton and trion-exciton complexes in BN encapsulated WSe2

Nature Communications
Zhipeng LiSu-Fei Shi

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.

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Citations

May 28, 2019·Nature Communications·T P LyonsA I Tartakovskii
Mar 16, 2019·Scientific Reports·Helena BragançaGilmar Eugenio Marques
Jun 7, 2019·Nature Communications·Zhipeng LiSu-Fei Shi
Aug 28, 2020·Nanoscale·M ZinkiewiczM R Molas
Sep 17, 2019·Physical Review Letters·M R MolasM Potemski
Jul 10, 2019·Physical Review Letters·Dinh Van TuanHanan Dery
Nov 8, 2019·Physical Review Letters·M R MolasM Potemski
Nov 9, 2019·Physical Review Letters·Ashish AroraRudolf Bratschitsch
Sep 30, 2018·Nature Nanotechnology·Cedric Robert
Aug 24, 2020·The Journal of Chemical Physics·Thomas GoldsteinJun Yan
Aug 7, 2019·Physical Review Letters·Erfu LiuChun Hung Lui
Feb 1, 2020·Nature Communications·Minhao HeXiaodong Xu
Jun 21, 2020·Nature Communications·Zhipeng LiSu-Fei Shi
Jan 16, 2021·Physical Review Letters·Koloman WagnerAlexey Chernikov
Dec 5, 2020·Science·Meng Xing Na, Ziliang Ye
Mar 9, 2021·Nano Letters·Małgorzata ZinkiewiczMaciej R Molas
Apr 4, 2021·Light, Science & Applications·Ying JiangAnlian Pan
Dec 4, 2019·The Journal of Physical Chemistry Letters·Jinqiu LiuMin Xiao
Mar 13, 2019·Nano Letters·Shao-Yu ChenJun Yan
Sep 7, 2019·Nano Letters·Zhipeng LiSu-Fei Shi
Sep 14, 2019·Nano Letters·Junyong WangGoki Eda
Oct 13, 2020·ACS Nano·Samuel BerwegerSanjini U Nanayakkara
Nov 16, 2018·ACS Nano·Hossein TaghinejadAli Adibi
May 11, 2019·ACS Applied Materials & Interfaces·Kang-Nyeoung LeeMun Seok Jeong
Dec 23, 2021·ACS Nano·Bumho KimJames Hone
Jan 4, 2022·Nano Letters·Marko M PetrićJonathan J Finley

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