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- Title
Intrinsic donor-bound excitons in ultraclean monolayer semiconductors.
- Authors
Rivera, Pasqual; He, Minhao; Kim, Bumho; Liu, Song; Rubio-Verdú, Carmen; Moon, Hyowon; Mennel, Lukas; Rhodes, Daniel A.; Yu, Hongyi; Taniguchi, Takashi; Watanabe, Kenji; Yan, Jiaqiang; Mandrus, David G.; Dery, Hanan; Pasupathy, Abhay; Englund, Dirk; Hone, James; Yao, Wang; Xu, Xiaodong
- Abstract
The monolayer transition metal dichalcogenides are an emergent semiconductor platform exhibiting rich excitonic physics with coupled spin-valley degree of freedom and optical addressability. Here, we report a new series of low energy excitonic emission lines in the photoluminescence spectrum of ultraclean monolayer WSe2. These excitonic satellites are composed of three major peaks with energy separations matching known phonons, and appear only with electron doping. They possess homogenous spatial and spectral distribution, strong power saturation, and anomalously long population (>6 µs) and polarization lifetimes (>100 ns). Resonant excitation of the free inter- and intravalley bright trions leads to opposite optical orientation of the satellites, while excitation of the free dark trion resonance suppresses the satellitesʼ photoluminescence. Defect-controlled crystal synthesis and scanning tunneling microscopy measurements provide corroboration that these features are dark excitons bound to dilute donors, along with associated phonon replicas. Our work opens opportunities to engineer homogenous single emitters and explore collective quantum optical phenomena using intrinsic donor-bound excitons in ultraclean 2D semiconductors. Here, the authors report intrinsic donor bound dark exciton states with associated phonon replicas in monolayer WSe2, and defect control crystal synthesis for the deterministic creation of these states.
- Subjects
EXCITON theory; SEMICONDUCTORS; SCANNING tunneling microscopy; MONOMOLECULAR films; DEGREES of freedom; DELAYED fluorescence
- Publication
Nature Communications, 2021, Vol 12, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-021-21158-8