The effects of thermal and correlated noise on magnons in a quantum ferromagnet

Jeske, J, Rivas, A, Ahmed, M, Martin-Delgado, M and Cole, J 2018, 'The effects of thermal and correlated noise on magnons in a quantum ferromagnet', New Journal of Physics, vol. 20, no. 9, pp. 1-17.

Document type: Journal Article
Collection: Journal Articles

Title The effects of thermal and correlated noise on magnons in a quantum ferromagnet
Author(s) Jeske, J
Rivas, A
Ahmed, M
Martin-Delgado, M
Cole, J
Year 2018
Journal name New Journal of Physics
Volume number 20
Issue number 9
Start page 1
End page 17
Total pages 17
Publisher Institute of Physics
Abstract The dynamics and thermal equilibrium of spin waves (magnons) in a quantum ferromagnet as well as the macroscopic magnetisation are investigated. Thermal noise due to an interaction with lattice phonons and the effects of spatial correlations in the noise are considered. We first present a Markovian master equation approach with analytical solutions for any homogeneous spatial correlation function of the noise. We find that spatially correlated noise increases the decay rate of magnons with low wave vectors to their thermal equilibrium, which also leads to a faster decay of the ferromagnet's magnetisation to its steady-state value. For long correlation lengths and higher temperature we find that additionally there is a component of the magnetisation which decays very slowly, due to a reduced decay rate of fast magnons. This effect could be useful for fast and noise-protected quantum or classical information transfer and magnonics. We further compare ferromagnetic and antiferromagnetic behaviour in noisy environments and find qualitatively similar behaviour in Ohmic but fundamentally different behaviour in super-Ohmic environments.
Subject Electronic and Magnetic Properties of Condensed Matter; Superconductivity
Quantum Information, Computation and Communication
Keyword(s) quantum noise
quantum ferromagnet
spin wave
master equations
DOI - identifier 10.1088/1367-2630/aadecf
Copyright notice © 2018 The Author(s)
ISSN 1367-2630
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