Signatures of moiré trions in WSe2/MoSe2 heterobilayers
Abstract
Moiré superlattices formed by van der Waals materials can support a wide range of electronic phases, including Mott insulators superconductors 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 effects. 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. In this work, 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.
- Authors:
-
[1];
[3];
[3];
[1];
[4];
[6];
[1]
- Univ. of California, Riverside, CA (United States)
- Stanford Univ., CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
- National Institute for Materials Science (NIMS), Tsukuba (Japan)
- Univ. of California, Riverside, CA (United States); Canadian Inst. for Advanced Research, Toronto, ON (Canada)
- SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)
- Academia Sinica, Taipei (Taiwan)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF); US Army Research Office (ARO); Ministry of Science and Technology
- OSTI Identifier:
- 1807794
- Grant/Contract Number:
- AC02-76SF00515; 1945660; 1651247; W911NF2110260; DMR-2004701; GBMF9462; 108-2112-M-001-041; 109-2112-M-001-046; DMR-1644779; PGSD3-502559-2017
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature (London)
- Additional Journal Information:
- Journal Name: Nature (London); Journal Volume: 594; Journal Issue: 7861; Journal ID: ISSN 0028-0836
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Liu, Erfu, Barré, Elyse, van Baren, Jeremiah, Wilson, Matthew, Taniguchi, Takashi, Watanabe, Kenji, Cui, Yong-Tao, Gabor, Nathaniel M., Heinz, Tony F., Chang, Yia-Chung, and Lui, Chun Hung. Signatures of moiré trions in WSe2/MoSe2 heterobilayers. United States: N. p., 2021.
Web. doi:10.1038/s41586-021-03541-z.
Liu, Erfu, Barré, Elyse, van Baren, Jeremiah, Wilson, Matthew, Taniguchi, Takashi, Watanabe, Kenji, Cui, Yong-Tao, Gabor, Nathaniel M., Heinz, Tony F., Chang, Yia-Chung, & Lui, Chun Hung. Signatures of moiré trions in WSe2/MoSe2 heterobilayers. United States. https://doi.org/10.1038/s41586-021-03541-z
Liu, Erfu, Barré, Elyse, van Baren, Jeremiah, Wilson, Matthew, Taniguchi, Takashi, Watanabe, Kenji, Cui, Yong-Tao, Gabor, Nathaniel M., Heinz, Tony F., Chang, Yia-Chung, and Lui, Chun Hung. Wed .
"Signatures of moiré trions in WSe2/MoSe2 heterobilayers". United States. https://doi.org/10.1038/s41586-021-03541-z. https://www.osti.gov/servlets/purl/1807794.
@article{osti_1807794,
title = {Signatures of moiré trions in WSe2/MoSe2 heterobilayers},
author = {Liu, Erfu and Barré, Elyse and van Baren, Jeremiah and Wilson, Matthew and Taniguchi, Takashi and Watanabe, Kenji and Cui, Yong-Tao and Gabor, Nathaniel M. and Heinz, Tony F. and Chang, Yia-Chung and Lui, Chun Hung},
abstractNote = {Moiré superlattices formed by van der Waals materials can support a wide range of electronic phases, including Mott insulators superconductors 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 effects. 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. In this work, 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.},
doi = {10.1038/s41586-021-03541-z},
journal = {Nature (London)},
number = 7861,
volume = 594,
place = {United States},
year = {Wed Jun 02 00:00:00 EDT 2021},
month = {Wed Jun 02 00:00:00 EDT 2021}
}
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