Electron-Phonon Interaction in 2D Charge-Density-Wave Materials

Metallic layered transition metal dicalchogenides often exhibit multiple types of electronic ordering tendencies, such as charge density waves, superconductivity, and Mott insulator phases. The ability to vary the dimensionality of these materials from layered bulk samples to few-layer and single-layer materials has provided new opportunities to explore the interplay between electron-phonon coupling, electron correlation, and interlayer interactions, which drive the ordering tendencies. Here we present first-principles calculations investigating how the electron-phonon interaction depends on dimensionality, doping, and strain in several of these materials, and discuss the impact on charge density wave instabilities.