An effective field theory of magneto-elasticity

Pavaskar, Shashin; Penco, Riccardo; Rothstein, Ira Z.

doi:10.21468/SciPostPhys.12.5.155

SciPost Physics

An effective field theory of magneto-elasticity

Shashin Pavaskar, Riccardo Penco, Ira Z. Rothstein

SciPost Phys. 12, 155 (2022) · published 11 May 2022

doi: 10.21468/SciPostPhys.12.5.155
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Abstract

We utilize the coset construction to derive the effective field theory of magnon-phonon interactions in (anti)-ferromagnetic and ferrimagnetic insulating materials. The action is used to calculate the equations of motion which generalize the Landau-Lifshitz and stress equations to allow for magneto-acoustic couplings to all orders in the fields at lowest order in the derivative expansion. We also include the symmetry breaking effects due to Zeeman, and Dzyaloshinsky-Moriya interactions. This effective theory is a toolbox for the study of magneto-elastic phenomena from first principles. As an example we use this theory to calculate the leading order contribution to the magnon decay width due to its the decay into phonons.

TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.12.5.155
TI  - An effective field theory of magneto-elasticity
PY  - 2022/05/11
UR  - https://www.scipost.org/SciPostPhys.12.5.155
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 12
IS  - 5
SP  - 155
A1  - Pavaskar, Shashin
AU  - Penco, Riccardo
AU  - Rothstein, Ira Z.
AB  - We utilize the coset construction to derive the effective field theory of magnon-phonon interactions in (anti)-ferromagnetic and ferrimagnetic insulating materials. The action is used to calculate the equations of motion which generalize the Landau-Lifshitz and stress equations to allow for magneto-acoustic couplings to all orders in the fields at lowest order in the derivative expansion. We also include the symmetry breaking effects due to Zeeman, and Dzyaloshinsky-Moriya interactions. This effective theory is a toolbox for the study of magneto-elastic phenomena from first principles. As an example we use this theory to calculate the leading order contribution to the magnon decay width due to its the decay into phonons.
ER  -

@Article{10.21468/SciPostPhys.12.5.155,
	title={{An effective field theory of magneto-elasticity}},
	author={Shashin Pavaskar and Riccardo Penco and Ira Z. Rothstein},
	journal={SciPost Phys.},
	volume={12},
	pages={155},
	year={2022},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.12.5.155},
	url={https://scipost.org/10.21468/SciPostPhys.12.5.155},
}

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¹ Carnegie Mellon University [CMU]

Funders for the research work leading to this publication