Topological, Valleytronic, and Optical Properties of Monolayer PbS
Topological, Valleytronic, and Optical Properties of Monolayer PbS
We systematically examine the topological, valleytronic, and optical properties of experimentally accessible PbS (001) few-layers, with a focus on the monolayer. With even-odd layer-dependent oscillations and without band inversions, the band gaps cover a wide spectrum from infrared to visible, making the few-layers promising for optoelectronics. Intriguingly, the uniaxial (biaxial) …