Coexisting Charge Density Waves in Twisted Bilayer NbSe₂.

ABSTRACT: Twisted bilayers of 2D materials have emerged as a tunable platform for studying broken symmetry phases. While most interest has been focused toward emergent states in systems whose constituent monolayers do not feature broken symmetry states, assembling monolayers that exhibit ordered states into twisted bilayers can also give rise to interesting phenomena. Here, we use first-principles density-functional theory calculations to study the atomic structure of twisted bilayer NbSe₂ whose constituent monolayers feature a charge density wave. We find that different charge density wave states coexist in the ground state of the twisted bilayer: monolayer-like 3 × 3 triangular and hexagonal charge density waves are observed in low-energy stacking regions, while stripe charge density wa

SUBMITTER: Cheung CTS 

PROVIDER: S-EPMC11450987 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature