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

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

2011-10-05

arxiv.org/abs/1110.1081v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figs., 1 table

Scientific paper

The Hall coefficient $R_H$ and resistivity $\rho$ 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 $\Delta_T$ of 50 mV. We find that hydrostatic pressure $P$ (0-27 kbar) has a pronounced effect on both $R_H$ and $\rho$. We show that these changes arise from decreases in both $\Delta_T$ and the hole effective mass under pressure.

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