Correlated insulator of excitons in WSe 2 /WS 2 moiré superlattices

Xiong, Richen; Nie, Jacob H.; Brantly, Samuel L.; Hays, Patrick; Sailus, Renee; Watanabe, Kenji; Taniguchi, Takashi; Tongay, Sefaattin; Jin, Chenhao

doi:10.1126/science.add5574

Correlated insulator of excitons in WSe ₂ /WS ₂ moiré superlattices

Journal Article · Fri May 26 04:00:00 EDT 2023 · Science

DOI:https://doi.org/10.1126/science.add5574· OSTI ID:2421629

^[1]; Nie, Jacob H. ^[2]; ^[2]; Hays, Patrick ^[3]; Sailus, Renee ^[3]; ^[4]; ^[5]; ^[3]; ^[2]

Department of Physics, University of California at Santa Barbara, Santa Barbara, CA 93106, USA.; OSTI
Department of Physics, University of California at Santa Barbara, Santa Barbara, CA 93106, USA.
School for Engineering of Matter, Transport, and Energy, Arizona State University, Tempe, AZ 85287, USA.
Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan.
International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan.

A panoply of unconventional electronic states has been observed in moiré superlattices. Engineering similar bosonic phases remains, however, largely unexplored. We report the observation of a bosonic correlated insulator in tungsten diselenide/tungsten disulfide (WSe₂/WS₂) moiré superlattices composed of excitons, that is, tightly bound electron-hole pairs. We develop a pump probe spectroscopy method that we use to observe an exciton incompressible state at exciton filling ν_ex= 1 and charge neutrality, indicating a correlated insulator of excitons. With varying charge density, the bosonic correlated insulator continuously transitions into an electron correlated insulator at charge filling ν_e= 1, suggesting a mixed correlated insulating state between the two limits. Our studies establish semiconducting moiré superlattices as an intriguing platform for engineering bosonic phases.

Research Organization:: Arizona State Univ., Tempe, AZ (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: SC0020653

OSTI ID:: 2421629

Journal Information:: Science, Journal Name: Science Journal Issue: 6647 Vol. 380; ISSN 0036-8075

Publisher:: AAAS

Country of Publication:: United States

Language:: English

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