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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Bandwidth-tuned Mott transition and superconductivity in moiré WSe2.

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Researchers explored high-transition-temperature superconductivity in tunable moiré WSe2 materials. They observed key phenomena like superconductivity and strange metals, linking strong correlation to high Tc in this new platform.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • High-transition-temperature (Tc) superconductivity in strongly correlated materials is a major unsolved problem.
  • Complex materials like cuprates are difficult to model, hindering progress.
  • The Hubbard model captures essential physics but is challenging to solve in moderate correlation regimes.

Purpose of the Study:

  • Investigate high-Tc superconductivity in a tunable moiré material system.
  • Map the phase diagram of moiré WSe2 in the moderate correlation regime.
  • Establish moiré WSe2 as a new platform for studying strongly correlated electron physics.

Main Methods:

  • Tuning moiré WSe2 bilayers via twist angle to achieve moderate correlation.
  • Electrostatic gating and electrical transport measurements.
  • Magneto-optical measurements to probe electronic properties.

Main Results:

  • Observed an antiferromagnetic insulator at one hole per moiré unit cell (ν=1).
  • Discovered superconducting domes upon electron and hole doping.
  • Identified unusual metallic states, including strange metals.
  • Found highest Tc values adjacent to the Mott transition, dependent on twist angle.

Conclusions:

  • Strong electron correlation is crucial for superconductivity in moiré WSe2.
  • Moiré WSe2 provides a controllable platform for studying high-Tc superconductivity.
  • The observed phenomena align with predictions from the Hubbard model in a tunable system.