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Correlated insulating states at fractional fillings of the WS2/WSe2 moiré lattice

Journal Article · · Nature Physics
 [1];  [2];  [2];  [3];  [2];  [2];  [4];  [4];  [5];  [3];  [6];  [1]
  1. Univ. of California, Riverside, CA (United States). Dept. of Materials Science and Engineering; Univ. of California, Riverside, CA (United States). Dept. of Physics and Astronomy
  2. Rensselaer Polytechnic Inst., Troy, NY (United States). Dept. of Chemical and Biological Engineering
  3. Carnegie Mellon Univ., Pittsburgh, PA (United States)
  4. National Inst. for Materials Science, Tsukuba (Japan)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  6. Rensselaer Polytechnic Inst., Troy, NY (United States). Dept. of Chemical and Biological Engineering; Rensselaer Polytechnic Inst., Troy, NY (United States). Dept. of Electrical, Computer and Systems Engineering
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Moiré superlattices of van der Waals materials, such as twisted graphene and transitional metal dichalcogenides, have recently emerged as a fascinating platform to study strongly correlated states in two dimensions (2D), thanks to the strong electron interaction in the moiré minibands. In most systems, the correlated states appear when the moiré lattice is filled by integer number of electrons per moiré unit cell. Recently, correlated states at fractional fillings of 1/3 and 2/3 holes per moiré unit cell has been reported in the WS2/WSe2 heterobilayer, hinting the long range nature of the electron interaction. In this work, employing a scanning microwave impedance microscopy technique that is sensitive to local electrical properties, we observe a series of correlated insulating states at fractional fillings of the moiré minibands on both electron- and hole-doped sides in angle-aligned WS2/WSe2 hetero-bilayers, with certain states persisting at temperatures up to 120 K. Monte Carlo simulations reveal that these insulating states correspond to ordering of electrons in the moiré lattice with a periodicity much larger than the moiré unit cell, indicating a surprisingly strong and long-range interaction beyond the nearest neighbors. Our findings usher in unprecedented opportunities in the study of strongly correlated states in two dimensions.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012670; SC0012509
OSTI ID:
1787596
Alternate ID(s):
OSTI ID: 1807308
Journal Information:
Nature Physics, Journal Name: Nature Physics Journal Issue: 6 Vol. 17; ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)Copyright Statement
Country of Publication:
United States
Language:
English

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