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10 September 2019 Taming antiferromagnetic quantum fluctuations for spin transport and entanglement (Conference Presentation)
Akashdeep Kamra
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Proceedings Volume 11090, Spintronics XII; 1109004 (2019) https://doi.org/10.1117/12.2528270
Event: SPIE Nanoscience + Engineering, 2019, San Diego, California, United States
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.
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Akashdeep Kamra "Taming antiferromagnetic quantum fluctuations for spin transport and entanglement (Conference Presentation)", Proc. SPIE 11090, Spintronics XII, 1109004 (10 September 2019); https://doi.org/10.1117/12.2528270
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KEYWORDS
Magnons
Interfaces
Liquids
Metals
Superposition
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