Prediction of antimagnon-polarons with intrinsic momentum-space level attraction
Abstract
Propagating hybrid quasiparticles formed by magnons and phonons (magnon-polarons) or photons (magnon-polaritons) typically exhibit level repulsion in momentum space. Level attraction, by contrast, requires an anti-phase channel and has so far been restricted to zero-dimensional systems mediated by dissipative baths. Here we predict the antimagnon-polaron in a continuous magnetoelastic medium, which inherently exhibits momentum-space level attraction. The spin-orbit-torque (SOT)-stabilized antimagnon precesses with opposite handedness, directly reversing the magnetoelastic coupling without requiring an external environment. This intrinsic attraction yields a distinctive 0/π phase-locked simultaneous growth. Micromagnetic simulations confirm this picture, revealing that the SOT-controlled balance between gain and damping drives a collective instability. This ultimately enables a continuously tunable, dc-pumped, single-frequency phonon laser, establishing a novel route for coherent acoustic emission.
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BibTeX
@misc{wang2026prediction,
title = {{Prediction of antimagnon-polarons with intrinsic momentum-space level attraction}},
author = {Chongzhou Wang and Zhengda Jing and Weichao Yu},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.07434},
eprint = {2611.07434},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.07434},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Prediction of antimagnon-polarons with intrinsic momentum-space level attraction
AU - Chongzhou Wang
AU - Zhengda Jing
AU - Weichao Yu
PY - 2026
DA - 2026/11/05
PB - arXiv
DO - 10.48550/arxiv.2611.07434
UR - https://arxiv.org/abs/2611.07434
AB - Propagating hybrid quasiparticles formed by magnons and phonons (magnon-polarons) or photons (magnon-polaritons) typically exhibit level repulsion in momentum space. Level attraction, by contrast, requires an anti-phase channel and has so far been restricted to zero-dimensional systems mediated by dissipative baths. Here we predict the antimagnon-polaron in a continuous magnetoelastic medium, which inherently exhibits momentum-space level attraction. The spin-orbit-torque (SOT)-stabilized antimagnon precesses with opposite handedness, directly reversing the magnetoelastic coupling without requiring an external environment. This intrinsic attraction yields a distinctive 0/π phase-locked simultaneous growth. Micromagnetic simulations confirm this picture, revealing that the SOT-controlled balance between gain and damping drives a collective instability. This ultimately enables a continuously tunable, dc-pumped, single-frequency phonon laser, establishing a novel route for coherent acoustic emission.
ER -