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

2024/12/13 by Viviana Gomez, Gomez, Viviana, Johanns Canaval +10
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Magnetic and transport properties of perovskites and related materials #Materials Science (cond-mat.mtrl-sci) #Phase-change materials and chalcogenides #Semiconductor Quantum Structures and Devices

paper · pdf · doi:10.48550/arxiv.2412.10539

openalex publication_date 2024/12/13 · openalex created_date 2024/12/18 · openalex updated_date 2026/07/28

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.

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