paper

Giant intrinsic spin Hall effect in the TaAs family of Weyl semimetals

arXiv:1604.07167 · doi:10.1103/PhysRevLett.117.146403

Abstract

Since their discovery, topological insulators have been expected to be ideal spintronic materials owing to the spin currents carried by surface states with spin--momentum locking. However, the bulk doping problem remains an obstacle that hinders such application. In this work, we predict that a newly discovered family of topological materials, the Weyl semimetals, exhibits large intrinsic spin Hall effects that can be utilized to generate and detect spin currents. Our calculations reveal a large spin Hall conductivity that is comparable to that of and transition metals. The spin Hall effect originates intrinsically from the bulk band structure of Weyl semimetals, which exhibit a large Berry curvature and spin--orbit coupling, so the bulk carrier problem in the topological insulators is naturally avoided. Our work not only paves the way for employing Weyl semimetals in spintronics, but also proposes a new guideline for searching for the spin Hall effect in various topological materials.

7 pages including supplemenatry informaiton, 3 + 4 figures and 1 table

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