Signatures of moiré trions in WSe2/MoSe2 heterobilayers

Erfu Liu, Elyse Barré, Jeremiah van Baren, Matthew Wilson, Takashi Taniguchi, Kenji Watanabe, Yong-Tao Cui, Nathaniel M. Gabor, Tony F. Heinz, Yia-Chung Chang () and Chun Hung Lui ()
Additional contact information
Erfu Liu: University of California
Elyse Barré: Stanford University
Jeremiah van Baren: University of California
Matthew Wilson: University of California
Takashi Taniguchi: National Institute for Materials Science (NIMS)
Kenji Watanabe: National Institute for Materials Science (NIMS)
Yong-Tao Cui: University of California
Nathaniel M. Gabor: University of California
Tony F. Heinz: SLAC National Accelerator Laboratory
Yia-Chung Chang: Academia Sinica
Chun Hung Lui: University of California

Nature, 2021, vol. 594, issue 7861, 46-50

Abstract: Abstract Moiré superlattices formed by van der Waals materials can support a wide range of electronic phases, including Mott insulators1–4, superconductors5–10 and generalized Wigner crystals2. When excitons are confined by a moiré superlattice, a new class of exciton emerges, which holds promise for realizing artificial excitonic crystals and quantum optical effects11–16. When such moiré excitons are coupled to charge carriers, correlated states may arise. However, no experimental evidence exists for charge-coupled moiré exciton states, nor have their properties been predicted by theory. Here we report the optical signatures of trions coupled to the moiré potential in tungsten diselenide/molybdenum diselenide heterobilayers. The moiré trions show multiple sharp emission lines with a complex charge-density dependence, in stark contrast to the behaviour of conventional trions. We infer distinct contributions to the trion emission from radiative decay in which the remaining carrier resides in different moiré minibands. Variation of the trion features is observed in different devices and sample areas, indicating high sensitivity to sample inhomogeneity and variability. The observation of these trion features motivates further theoretical and experimental studies of higher-order electron correlation effects in moiré superlattices.

Date: 2021
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DOI: 10.1038/s41586-021-03541-z

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