Phonon angular momentum transfer torque
Abstract
Angular momentum in solids is carried by (quasi)particles such as magnons, plasmons, and phonons, and coupling between these reservoirs enables diverse hybrid phenomena. Here, we introduce the transfer of angular momentum from lattice vibrations to magnetic order through the phonon angular momentum transfer torque (PAMTT), generated by a polarized phonon bath. We identify thermal routes for generating phonon angular momentum: a phonon Edelstein accumulation in noncentrosymmetric crystals and temperature-gradient-induced PAM currents with longitudinal Seebeck-like and transverse Hall components. Using realistic order-of-magnitude estimates, we find that PAMTT could produce measurable ferromagnetic-resonance frequency shifts and, for favorable interfacial coupling, drive magnetization reversal on nanosecond timescales.
Related
- Precessional modes of phonon angular momentum
- Symmetry-Selective Topological Magnon Engineering by Phonon Angular Momentum
- Theory of phonon-magnon hybridization and angular momentum in CrI3 and CrBr3
- Equivalent Pseudo-angular Momentum Governs Selective Magnon-Phonon Hybridization
- The phonomagnet: Spontaneous order of phonon angular momentum
BibTeX
@misc{brehm2026phonon,
title = {{Phonon angular momentum transfer torque}},
author = {Verena Brehm and Daniel A. Bustamante Lopez and Shu Zhang and Dominik Juraschek},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.32575},
eprint = {2609.32575},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.32575},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Phonon angular momentum transfer torque
AU - Verena Brehm
AU - Daniel A. Bustamante Lopez
AU - Shu Zhang
AU - Dominik Juraschek
PY - 2026
DA - 2026/09/26
PB - arXiv
DO - 10.48550/arxiv.2609.32575
UR - https://arxiv.org/abs/2609.32575
AB - Angular momentum in solids is carried by (quasi)particles such as magnons, plasmons, and phonons, and coupling between these reservoirs enables diverse hybrid phenomena. Here, we introduce the transfer of angular momentum from lattice vibrations to magnetic order through the phonon angular momentum transfer torque (PAMTT), generated by a polarized phonon bath. We identify thermal routes for generating phonon angular momentum: a phonon Edelstein accumulation in noncentrosymmetric crystals and temperature-gradient-induced PAM currents with longitudinal Seebeck-like and transverse Hall components. Using realistic order-of-magnitude estimates, we find that PAMTT could produce measurable ferromagnetic-resonance frequency shifts and, for favorable interfacial coupling, drive magnetization reversal on nanosecond timescales.
ER -