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arXiv · 1110.1081

Effect of hydrostatic pressure on transport in the topological insulator Bi$_2$Te$_2$Se

Yongkang Luo·Stephen Rowley·Jun Xiong·Shuang Jia·R. J. Cava·N. P. Ong
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Abstract

The Hall coefficient $R_H$ and resistivity $ρ$ of the topological insulator Bi$_2$Te$_2$Se display a number of puzzling features vs. temperature $T$. We propose a model that describes well the non-monotonic variation of $R_H(T)$. A key feature of the model is a chemical potential that is weakly $T$-dependent. From the fit to the model, we infer a "transport" gap $Δ_T$ of 50 mV. We find that hydrostatic pressure $P$ (0-27 kbar) has a pronounced effect on both $R_H$ and $ρ$. We show that these changes arise from decreases in both $Δ_T$ and the hole effective mass under pressure.

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Yongkang Luo, Stephen Rowley, Jun Xiong, Shuang Jia, R. J. Cava, N. P. Ong. 2011-10-05. Effect of hydrostatic pressure on transport in the topological insulator Bi$_2$Te$_2$Se. https://arxiv.org/abs/1110.1081

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