Four-band tight-binding model of TiSiCO-family monolayers
Four-band tight-binding model of TiSiCO-family monolayers
The TiSiCO-family monolayers have recently been attracting significant attention due to their unique valley-layer coupling (VLC). In this work, we present a minimal, four-band tight-binding (TB) model to capture the low-energy physics of the TiSiCO-family monolayers ${Z}_{2}Y{\mathrm{CO}}_{2}$ $(Z=\text{Ti}, \mathrm{Zr}, \mathrm{Hf}; Y=\text{Si}, \mathrm{Ge})$ with strong VLC. These monolayers comprise two $Z$ …