Abstract

ABC-stacked trilayer graphene on boron nitride (ABC-TLG/hBN) moiré superlattices provides a tunable platform for exploring Wigner crystal states in which the electron correlation can be controlled by electric and magnetic fields. Here, in this work, we report the observation of magnetic field-stabilized Wigner crystal states in a ABC-TLG/hBN. We show that correlated insulating states emerge at multiple fractional and integer fillings corresponding to ν = 1/3, 2/3, 1, 4/3, 5/3, and 2 electrons per moiré lattice site under a magnetic field. These correlated insulating states can be attributed to generalized Mott states for the integer fillings and generalized Wigner crystal states for the fractional fillings. The generalized Wigner crystal states are stabilized by a vertical magnetic field and are strongest at one magnetic flux quantum per three moiré superlattices. The ν = 2 insulating state persists up to 30 T, which can be described by a Mott–Hofstadter transition at a high magnetic field.

Authors:

Chen, Guorui  ^[1];

• Search DOE PAGES for author "Chen, Guorui"
• Search DOE PAGES for ORCID "0000-0002-4919-4796"

Zhang, Ya-Hui ^[2]; Sharpe, Aaron  ^[3];

• Search DOE PAGES for author "Sharpe, Aaron"
• Search DOE PAGES for ORCID "0000-0002-4260-8546"

Zhang, Zuocheng ^[4]; Wang, Shaoxin ^[4]; Jiang, Lili ^[4]; Lyu, Bosai  ^[5];

• Search DOE PAGES for author "Lyu, Bosai"
• Search DOE PAGES for ORCID "0000-0001-8044-5509"

Li, Hongyuan  ^[4];

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• Search DOE PAGES for ORCID "0000-0001-9119-5592"

Watanabe, Kenji  ^[6];

• Search DOE PAGES for author "Watanabe, Kenji"
• Search DOE PAGES for ORCID "0000-0003-3701-8119"

Taniguchi, Takashi  ^[6];

• Search DOE PAGES for author "Taniguchi, Takashi"
• Search DOE PAGES for ORCID "0000-0002-1467-3105"

Shi, Zhiwen  ^[5];

• Search DOE PAGES for author "Shi, Zhiwen"
• Search DOE PAGES for ORCID "0000-0002-3928-2960"

Goldhaber-Gordon, David ^[7]; Zhang, Yuanbo ^[8]; Wang, Feng ^[9]

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+ Show Author Affiliations

1. Shanghai Jiao Tong Univ. (China); Univ. of California, Berkeley, CA (United States)
2. Harvard Univ., Cambridge, MA (United States)
3. Stanford Univ., CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
4. Univ. of California, Berkeley, CA (United States)
5. Shanghai Jiao Tong Univ. (China)
6. National Institute for Materials Science (NIMS), Tsukuba (Japan)
7. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Stanford Univ., CA (United States)
8. Fudan Univ., Shanghai (China)
9. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Publication Date:

Thu Jul 20 00:00:00 EDT 2023

Research Org.:

SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Org.:

USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:

1999588

Grant/Contract Number:  

AC02-76SF00515; NA0003525

Resource Type:

Accepted Manuscript

Journal Name:

Nano Letters

Additional Journal Information:

Journal Volume: 23; Journal Issue: 15; Journal ID: ISSN 1530-6984

Publisher:

American Chemical Society

Country of Publication:

United States

Language:

English

Subject:

77 NANOSCIENCE AND NANOTECHNOLOGY; graphene; moiré superlattice; Wigner crystal; Hofstadter butterfly; Mott insulator; flat band