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October 3, 2025Open Access

Dirac quantum criticality in twisted double bilayer transition metal dichalcogenides

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Authors

JBJosef BiedermannLJLukas Janssen

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Overview

Investigates the transition from Dirac semimetal to antiferromagnetic insulator in twisted double bilayer materials, suggesting significant quantum behavior.

Key Points

  • A continuous transition from a Dirac semimetal to an antiferromagnetic insulator occurs at varying twist angles or pressures, impacting electronic properties greatly.
  • Self-consistent Hartree-Fock calculations reveal competing ground states characterized by spin-density modulations at small twist angles.
  • The phase diagram shows a crossover induced by finite heterostrain, linking Gross-Neveu-Heisenberg universality with conventional criticality as temperature decreases.
  • Decreasing the twist angle further leads to a potential level crossing into a ferromagnetic insulator, showcasing complex magnetic behaviors.

Cite This Study

Biedermann et al. (2025) studied this question.

synapsesocial.com/papers/68e02f40f0e39f13e7fa2a88https://doi.org/10.48550/arxiv.2509.04561
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