Search arXiv⌕ Search
Home/Archive/arXiv

arXiv · 2610.34857

Equivalent Pseudo-angular Momentum Governs Selective Magnon-Phonon Hybridization

Hong Sun·Hao Chen·Lifa Zhang
View original source ↗Read source document ↗Export metadata ↓

Abstract

Magnon-phonon hybridization provides a powerful route to couple spin and lattice excitations, yet the symmetry principle governing mode selectivity remains unclear. Here, we show that crystalline pseudoangular momentum provides a general criterion for selective magnon-phonon hybridization in noncollinear multisublattice magnetic systems. The rotation eigenvalue associated with pseudoangular momentum encodes polarization transformations, sublattice permutations, and Bloch phases, requiring magnetoelastic coupling between modes belonging to the same rotation sector. We illustrate this principle in a stacked kagome model with noncollinear spin order. An out-of-plane magnetic field tunes one magnon sector into resonance with a degenerate phonon doublet, yet only the pseudoangular-momentum-matched phonon develops a pronounced avoided crossing while the other remains nearly unmixed. Field reversal switches the selected rotation sector and reverses the rotational polarization of the hybridized phonon component without changing the hybrid-mode energies. Our results reveal pseudoangular-momentum matching as a general framework for understanding and controlling mode-selective spin-lattice hybridization.

Explore related subjects

cond-mat.other

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Hong Sun, Hao Chen, Lifa Zhang. 2026-10-26. Equivalent Pseudo-angular Momentum Governs Selective Magnon-Phonon Hybridization. https://arxiv.org/abs/2610.34857

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv2026

Giant third-order nonlinearity amplifies second-harmonic transport in Ca3Ru2O7

Nonlinear electrical transport enables the conversion and detection of electromagnetic signals, supporting wireless energy harvesting, sensing and frequency conversion. Achieving both a large response and electrical tunability remains a central materials challenge. Here we harness giant third-order nonlinearity to amplify and electrically control second-harmonic transport in the correlated polar metal Ca3Ru2O7. Superposing a dc bias on an ac excitation enhances the second-harmonic signal by more than an order of magnitude. The bias controls the polarity of the induced response and activates channels forbidden by symmetry at zero bias. Both transverse and longitudinal components scale quadratically with the ac excitation and are odd in the dc bias, with angular dependences consistent with third-order conductivity. The underlying third-harmonic electric-field responsivity reaches 4.5 \times 10-6 m2V-2 at 3 K, providing a quantitative measure of the strong nonlinearity. The induced response emerges below the spin-reorientation transition near 48 K, linking its enhancement to the reconstructed low-temperature electronic state. Theoretical calculations identify quantum-geometric contributions to the nonlinear conductivity and reproduce the observed response symmetry. These results demonstrate how strong higher-order nonlinearity can amplify an effective second-order response, providing a route to electrically tunable nonlinear transport in correlated materials.

cond-mat.other↗
arXiv2026

The Evolution and Current State of Swift-Heavy-Ion Track Modeling

This paper briefly reviews the modeling approaches to the swift heavy ion (SHI) track formation. It presents a step-by-step derivation of the two-temperature model, highlighting its underlying assumptions and approximations. Special attention is given to identifying assumptions that fail under the typical SHI track conditions, and what methods currently exist to go beyond them. As an alternative to analytical approximations, a combined Monte Carlo- molecular dynamics model is demonstrated, outlining its basic assumptions, their justifications, and validations. Finally, the paper addresses bottlenecks of the current multiscale approach, its remaining weaknesses, and necessary further developments of the theory and models.

cond-mat.other↗
arXiv2026

Electrically Reversible Layer-Tensor Responses in Bilayers

The layer Hall effect provides a prototypical example of a hidden layer response in van der Waals bilayers: opposite layers carry compensating Hall currents at zero out-of-plane electric field, while an applied out-of-plane electric field $E_z$ selects one layer over the other and switches the net Hall response. Here we show that this field-switching mechanism is not restricted to Hall transport, but follows from a general symmetry principle for response tensors. We formulate a selection rule for the layer tensor effect (LTE) using Jahn symbols. For a tensor with Jahn symbol $J$ and rank $r$, the stacking operation that exchanges the two layers acts as a coset representative relating the $+E_z$ and $-E_z$ states. Tensor components that are odd under this operation are forced to cancel between layers at $E_z=0$, and acquire a macroscopic response satisfying $T_α(+E_z)=-T_α(-E_z)$. This criterion allows us to enumerate the symmetry-allowed electrically reversible tensor components associated with different Jahn symbols and to identify their physical realizations in common response tensors. We apply the theory to representative anomalous Hall, shift-current, nonlinear Drude, piezoelectric, spin Hall, and spin-photocurrent channels. Model calculations and first-principles simulations further confirm the predicted field-odd responses. Our results establish an electrically switchable LTE framework, providing a unified route to multifunctional layertronic responses in bilayer materials.

cond-mat.other↗