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arXiv · 2002.02673

Spin-dependent transport through a Weyl semimetal surface

V. D. Esin·D. N. Borisenko·N. N. Kolesnikov·E. V. Deviatov
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Abstract

We experimentally compare two types of interface structures with magnetic and non-magnetic Weyl semimetals. They are the junctions between a gold normal layer and magnetic Weyl semimetal Ti$_2$MnAl, and a ferromagnetic nickel layer and non-magnetic Weyl semimetal WTe$_2$, respectively. Due to the ferromagnetic side of the junction, we investigate spin-polarized transport through the Weyl semimetal surface. For both structures, we demonstrate similar current-voltage characteristics, with hysteresis at low currents and sharp peaks in differential resistance at high ones. Despite this behavior resembles the known current-induced magnetization dynamics in ferromagnetic structures, evolution of the resistance peaks with magnetic field is unusual. We connect the observed effects with current-induced spin dynamics in Weyl topological surface states.

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V. D. Esin, D. N. Borisenko, N. N. Kolesnikov, E. V. Deviatov. 2020-02-07. Spin-dependent transport through a Weyl semimetal surface. https://doi.org/10.1103/physrevb.101.155309

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