Proximity-induced charge density waves in a moiré heterobilayer
Abstract
Twisted heterobilayers of two-dimensional materials have emerged as a platform for studying emergent phases of matter. In this work, we investigate charge density waves (CDW) in a twisted NbSe2/MoSe2 bilayer using first-principles calculations. We observe CDW formation in both layers, even though MoSe2 does not feature a CDW in its monolayer form. Moreover, we find that the CDW is highly non-uniform with filled-center, hollow-center and hexagonal CDWs coexisting in the moiré unit cells of both layers. We assess different mechanisms of CDW formation in the MoSe2 layer and conclude that the dominant one is the steric repulsion between Se atoms across the van der Waals gap. The strength of this effect is highly sensitive to the interlayer separation, which explains why the CDW amplitude in the MoSe2 layer depends strongly on the local stacking arrangement. Our work demonstrates that novel broken-symmetry phases can be induced in twisted heterobilayers through proximity effects.
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BibTeX
@misc{cheung2026proximityinduced,
title = {{Proximity-induced charge density waves in a moiré heterobilayer}},
author = {Christopher T. S. Cheung and Arash A. Mostofi and Johannes Lischner},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2609.15775},
eprint = {2609.15775},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.15775},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Proximity-induced charge density waves in a moiré heterobilayer
AU - Christopher T. S. Cheung
AU - Arash A. Mostofi
AU - Johannes Lischner
PY - 2026
DA - 2026/10/04
PB - arXiv
DO - 10.48550/arxiv.2609.15775
UR - https://arxiv.org/abs/2609.15775
AB - Twisted heterobilayers of two-dimensional materials have emerged as a platform for studying emergent phases of matter. In this work, we investigate charge density waves (CDW) in a twisted NbSe_2/MoSe_2 bilayer using first-principles calculations. We observe CDW formation in both layers, even though MoSe_2 does not feature a CDW in its monolayer form. Moreover, we find that the CDW is highly non-uniform with filled-center, hollow-center and hexagonal CDWs coexisting in the moiré unit cells of both layers. We assess different mechanisms of CDW formation in the MoSe_2 layer and conclude that the dominant one is the steric repulsion between Se atoms across the van der Waals gap. The strength of this effect is highly sensitive to the interlayer separation, which explains why the CDW amplitude in the MoSe_2 layer depends strongly on the local stacking arrangement. Our work demonstrates that novel broken-symmetry phases can be induced in twisted heterobilayers through proximity effects.
ER -