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Proceedings Paper

Taming antiferromagnetic quantum fluctuations for spin transport and entanglement (Conference Presentation)
Author(s): Akashdeep Kamra

Paper Abstract

Antiferromagnets host strong quantum fluctuations that may result in a disordered spin liquid ground state, instead of the classical Néel ordered configuration. We show that the same quantum fluctuations imbue the spin-1 excitations, typically called magnons, in easy-axis antiferromagnets with remarkable quantum properties such as entanglement. We find that these spin-1 excitations are comprised by a superposition of a large number of states with spin N+1 on one sublattice and spin -N on the other, such that the net spin remains 1. The ensuing many-body and massively-entangled nature of the antiferromagnet magnons abets a strong coupling to their environment, and thus an enhanced damping. Hence, this new understanding of the eigenmodes provides a physically intuitive picture for the well known exchange enhancement in the damping of antiferromagnetic dynamics. The same strong coupling to the environment leads to a significantly enhanced spin pumping current into an adjacent normal metal when the antiferromagnet interface is uncompensated.

Paper Details

Date Published: 10 September 2019
Proc. SPIE 11090, Spintronics XII, 1109004 (10 September 2019); doi: 10.1117/12.2528270
Show Author Affiliations
Akashdeep Kamra, Norwegian Univ. of Science and Technology (Norway)

Published in SPIE Proceedings Vol. 11090:
Spintronics XII
Henri-Jean M. Drouhin; Jean-Eric Wegrowe; Manijeh Razeghi, Editor(s)

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