Vacancy and Antisite-Induced Ferromagnetism in Liquid-Phase Exfoliated Bi2Te3

Abstract Bismuth Telluride (Bi2Te3) is a widely studied topological insulator, recognized for its unique surface states, low electronic bandgap, and low thermal conductivity. In this study, we characterize exfoliated Bi2Te3 dispersions produced via solvothermal intercalation, where ferromagnetism was measured at room temperature. DFT simulations show that this ferromagnetic behavior is attributed to the presence
of vacancies and antisites in both the bulk material and the exfoliated crystals. Additionally, the DFT results were complemented by experimental measurements of the optical bandgap using UV-Vis spectroscopy, revealing a broadening of the bandgap
as the material becomes thinner.