We explore theoretically how the topological properties of 2D materials can be manipulated by cavity quantum electromagnetic fields for both resonant and off-resonant electron-photon coupling, with a focus on van der Waals moir\'e superlattices. We investigate an electron-photon topological Chern number for the cavity-dressed energy minibands that is well defined for any degree of hybridization of the electron and photon states. While an off-resonant cavity mode can renormalize electronic topological phases that exist without cavity coupling, we show that when the cavity mode is resonant to electronic miniband transitions, new and higher electron-photon Chern numbers can emerge.
@article{arxiv.2303.08804,
title = {Electron-photon Chern number in cavity-embedded 2D moir\'e materials},
author = {Danh-Phuong Nguyen and Geva Arwas and Zuzhang Lin and Wang Yao and Cristiano Ciuti},
journal= {arXiv preprint arXiv:2303.08804},
year = {2023}
}
Comments
PRL accepted version (additional figures with respect to version v1 have been added both in the manuscript and Supplementary Material)