Observation of the Interlayer Exciton Gases in WSe2 -p:WSe2 Heterostructures

Sun, Zheng; Beaumariage, Jonathan; Cao, Qingrui; Watanabe, Kenji; Taniguchi, Takashi; Hunt, Benjamin Matthew; Snoke, David

doi:10.1021/acsphotonics.0c00476

Observation of the Interlayer Exciton Gases in WSe₂ -p:WSe₂ Heterostructures

Journal Article · Mon Jun 22 00:00:00 EDT 2020 · ACS Photonics

DOI:https://doi.org/10.1021/acsphotonics.0c00476· OSTI ID:1803250

^[1]; Beaumariage, Jonathan ^[2]; Cao, Qingrui ^[3]; ^[4]; ^[4]; Hunt, Benjamin Matthew ^[3]; Snoke, David ^[2]

Univ. of Pittsburgh, PA (United States). Dept. of Physics and Astronomy; OSTI
Univ. of Pittsburgh, PA (United States). Dept. of Physics and Astronomy
Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Physics
National Institute for Materials Science (NIMS), Tsukuba (Japan)

Interlayer excitons (IXs) possess a much longer lifetime than intralayer excitons due to the spatial separation of the electrons and holes, and hence they have been pursued to create exciton condensates for decades. The recent emergence of 2D materials, such as transition-metal dichalcogenides (TMDs), and of their van der Waals heterostructures, in which two different 2D materials are layered together, has created new opportunities to study IXs. Here we present the observation of IX gases within two stacked structures consisting of hBN/WSe₂/hBN/p:WSe₂/hBN. The IX energies of the two different structures differed by 82 meV due to the different thicknesses of the hexagonal boron nitride spacer layer between the TMD layers. We demonstrate that the lifetime of the IXs is shortened when the temperature and the pump power increase. We attribute this nonlinear behavior to an Auger process.

View Accepted Manuscript (DOE)

Research Organization:: Carnegie Mellon Univ., Pittsburgh, PA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0018115

OSTI ID:: 1803250

Journal Information:: ACS Photonics, Journal Name: ACS Photonics Journal Issue: 7 Vol. 7; ISSN 2330-4022

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Observation of the Interlayer Exciton Gases in WSe2 -p:WSe2 Heterostructures

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Observation of the Interlayer Exciton Gases in WSe₂ -p:WSe₂ Heterostructures