Quantum-Confined Lifshitz Transition on Weyl Semimetal T_d-MoTe₂.

ABSTRACT: Adsorption of alkali atoms onto material surfaces is widely utilized for controlling electronic properties and is particularly effective for two-dimensional materials. While tuning the chemical potential and band gap and creating quantum-confined states are well established for alkali adsorption on semiconductors, the effects on semimetallic systems remain largely elusive. Here, utilizing angle-resolved photoemission spectroscopy measurements and density functional theory calculations, we disclose the creation of two-dimensional electron gas and the quantum-confined Lifshitz transition at the surface of a Weyl semimetal T_d-MoTe₂ by potassium adsorption. Electrons from potassium adatoms are shown to be transferred mainly to the lowest unoccupied band within the

SUBMITTER: Jung H 

PROVIDER: S-EPMC11363146 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature