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arXiv · 2412.10539

Vacancy and Antisite-Induced Ferromagnetism in Liquid-Phase Exfoliated Bi$_2$Te$_3$

Viviana Gomez·Maria Jose Saenz·Johanns Canaval·Liliana Cuadrado·Camilo Espejo·William Lopez·Yenny Hernandez
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Abstract

Bismuth Telluride (Bi$_2$Te$_3$) 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 Bi$_2$Te$_3$ 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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Viviana Gomez, Maria Jose Saenz, Johanns Canaval, Liliana Cuadrado, Camilo Espejo, William Lopez, Yenny Hernandez. 2024-12-13. Vacancy and Antisite-Induced Ferromagnetism in Liquid-Phase Exfoliated Bi$_2$Te$_3$. https://arxiv.org/abs/2412.10539

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