Research: Dirac quantum criticality in twisted double bilayer transition metal dichalcogenides

Dirac fermions play an important role in many emerging quantum materials. Although the unusual phenomena associated with their quantum phase transition have been predicted theoretically for many years, they have remained difficult to access experimentally. The authors show that twisted bilayers of WSe2 provide a promising platform for studying these effects in a controlled manner. By tuning the twist angle or applying pressure, the system can be driven through a transition between conducting and insulating behavior. This opens up new opportunities for experimentally exploring the fundamental properties of strongly correlated quantum systems.

J. Biedermann, L. Janssen, 
Dirac quantum criticality in twisted double bilayer transition metal dichalcogenides,
Phys. Rev. B 113, 245123 (2026) (Editors' Suggestion) (arXiv)