Evidence of the ferroelectric polarization in charge transport through WTe$_2$ Weyl semimetal surface

N. N. Orlova; N. S. Ryshkov; A. V. Timonina; N. N. Kolesnikov; E. V. Deviatov

doi:10.1134/S0021364021060011

paper

Evidence of the ferroelectric polarization in charge transport through WTe $_{2}$ Weyl semimetal surface

arXiv:2007.12078 · doi:10.1134/S0021364021060011

Abstract

We investigate electron transport along the surface of WTe $_{2}$ three-dimensional single crystals, which are characterized by coexistence of Weyl semimetal conductivity and ferroelectricity at room temperature. We find that non-linear behavior of $d V / d I (I)$ WTe $_{2}$ differential resistance is accompanied by slow relaxation process, which appears as the $d V / d I (I)$ dependence on the sign of the current change. This observation is confirmed by direct investigation of time-dependent relaxation curves. While strongly non-linear differential resistance should be expected for the zero-gap WTe $_{2}$ , the slow relaxation in transport is very unusual for well-conducting semimetals at room temperature. We establish, that non-monotonous dependence of the amplitude of the effect on driving current $Δ d V / d I (I)$ well corresponds to the known Sawyer-Tower's ferroelectric hysteresis loop. This conclusion is also confirmed by gate voltage dependencies, so our results can be understood as a direct demonstration of WTe $_{2}$ ferroelectric polarization in charge transport experiment.

Evidence of the ferroelectric polarization in charge transport through WTe $_{2}$ Weyl semimetal surface

Abstract

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Evidence of the ferroelectric polarization in charge transport through WTe2​ Weyl semimetal surface

Abstract

References in corpus (5)

Cited by in corpus (7)

Evidence of the ferroelectric polarization in charge transport through WTe $_{2}$ Weyl semimetal surface