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arXiv · 1509.01463

Hall effect in the extremely large magnetoresistance semimetal WTe$_2$

Yongkang Luo·H. Li·Y. M. Dai·H. Miao·Y. G. Shi·H. Ding·A. J. Taylor·D. A. Yarotski·R. P. Prasankumar·J. D. Thompson
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Abstract

We systematically measured the Hall effect in the extremely large magnetoresistance semimetal WTe$_2$. By carefully fitting the Hall resistivity to a two-band model, the temperature dependencies of the carrier density and mobility for both electron- and hole-type carriers were determined. We observed a sudden increase of the hole density below $\sim$160~K, which is likely associated with the temperature-induced Lifshitz transition reported by a previous photoemission study. In addition, a more pronounced reduction in electron density occurs below 50~K, giving rise to comparable electron and hole densities at low temperature. Our observations indicate a possible electronic structure change below 50~K, which might be the direct driving force of the electron-hole ``compensation'' and the extremely large magnetoresistance as well. Numerical simulations imply that this material is unlikely to be a perfectly compensated system.

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Yongkang Luo, H. Li, Y. M. Dai, H. Miao, Y. G. Shi, H. Ding, A. J. Taylor, D. A. Yarotski, R. P. Prasankumar, J. D. Thompson. 2015-09-04. Hall effect in the extremely large magnetoresistance semimetal WTe$_2$. https://doi.org/10.1063/1.4935240

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