RKKY spin coupling between opposite surfaces of a Weyl semimetal slab is strong, non-monotonic in thickness, and peaks at a critical thickness set by the Weyl node separation.
Quantum transport simulation of non-local response in Weyl semimetals
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abstract
We numerically study the non-local transport signature in Weyl semimetal as a test for interconnectedness of the surface states, using a recursive Green's function method. We drive a current using two leads connected on the same surface (top surface) and apply a magnetic field throughout the system, perpendicular to the surface. We find that this results in a current flowing on the other surface in the direction opposite to the direction of the current on the top surface and we comment on the viability of observing such an effect in experiment. The recursive Green's function method we employ is exact and provides us with the Green's functions of the two surfaces as well as their connecting elements, which can be applied also for other numerical simulations where the effect of surface to surface transport is important.
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cond-mat.mes-hall 1years
2019 1verdicts
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RKKY coupling in Weyl semimetal thin films
RKKY spin coupling between opposite surfaces of a Weyl semimetal slab is strong, non-monotonic in thickness, and peaks at a critical thickness set by the Weyl node separation.