Bilayer Wigner crystals in a transition metal dichalcogenide heterostructure

You Zhou, Jiho Sung, Elise Brutschea, Ilya Esterlis, Yao Wang, Giovanni Scuri, Ryan J. Gelly, Hoseok Heo, Takashi Taniguchi, Kenji Watanabe, Gergely Zaránd, Mikhail D. Lukin, Philip Kim, Eugene Demler () and Hongkun Park ()
Additional contact information
You Zhou: Harvard University
Jiho Sung: Harvard University
Elise Brutschea: Harvard University
Ilya Esterlis: Harvard University
Yao Wang: Harvard University
Giovanni Scuri: Harvard University
Ryan J. Gelly: Harvard University
Hoseok Heo: Harvard University
Takashi Taniguchi: National Institute for Materials Science
Kenji Watanabe: National Institute for Materials Science
Gergely Zaránd: Budapest University of Technology and Economics
Mikhail D. Lukin: Harvard University
Philip Kim: Harvard University
Eugene Demler: Harvard University
Hongkun Park: Harvard University

Nature, 2021, vol. 595, issue 7865, 48-52

Abstract: Abstract One of the first theoretically predicted manifestations of strong interactions in many-electron systems was the Wigner crystal1–3, in which electrons crystallize into a regular lattice. The crystal can melt via either thermal or quantum fluctuations4. Quantum melting of the Wigner crystal is predicted to produce exotic intermediate phases5,6 and quantum magnetism7,8 because of the intricate interplay of Coulomb interactions and kinetic energy. However, studying two-dimensional Wigner crystals in the quantum regime has often required a strong magnetic field9–11 or a moiré superlattice potential12–15, thus limiting access to the full phase diagram of the interacting electron liquid. Here we report the observation of bilayer Wigner crystals without magnetic fields or moiré potentials in an atomically thin transition metal dichalcogenide heterostructure, which consists of two MoSe2 monolayers separated by hexagonal boron nitride. We observe optical signatures of robust correlated insulating states at symmetric (1:1) and asymmetric (3:1, 4:1 and 7:1) electron doping of the two MoSe2 layers at cryogenic temperatures. We attribute these features to bilayer Wigner crystals composed of two interlocked commensurate triangular electron lattices, stabilized by inter-layer interaction16. The Wigner crystal phases are remarkably stable, and undergo quantum and thermal melting transitions at electron densities of up to 6 × 1012 per square centimetre and at temperatures of up to about 40 kelvin. Our results demonstrate that an atomically thin heterostructure is a highly tunable platform for realizing many-body electronic states and probing their liquid–solid and magnetic quantum phase transitions4–8,17.

Date: 2021
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DOI: 10.1038/s41586-021-03560-w

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