Symmetry-dictated switching of antiferromagnetic magnon transport in 2D multiferroics

Baibiao Huang; Jiale Wang; Jiexiang Wang; Xinru Li; Yandong Ma; Yibo Liu; Ying Dai

arxiv: 2604.20064 · v1 · submitted 2026-04-22 · ❄️ cond-mat.mtrl-sci

Symmetry-dictated switching of antiferromagnetic magnon transport in 2D multiferroics

Yibo Liu , Jiale Wang , Jiexiang Wang , Ying Dai , Baibiao Huang , Xinru Li , Yandong Ma This is my paper

Pith reviewed 2026-05-10 00:46 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci

keywords 2D multiferroicsantiferromagnetic magnonsmagnon Berry curvatureanomalous thermal Hall effectferroelectric switchingmagnon transportCuCr2Se4Dzyaloshinskii-Moriya interaction

0 comments

The pith

Reversing ferroelectric polarization inverts the net magnon Berry curvature and anomalous thermal Hall conductivity in 2D antiferromagnetic multiferroics.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper establishes a mechanism where ferroelectric polarization controls antiferromagnetic magnon transport in two-dimensional multiferroics by inducing asymmetry between magnetic sublattices in their exchange and Dzyaloshinskii-Moriya interactions. This asymmetry breaks the usual exact cancellation between magnons of opposite chirality that occurs in collinear antiferromagnets, generating a net Berry curvature and an associated anomalous thermal Hall conductivity. Reversing the polarization direction swaps the sublattice asymmetries and thereby reverses the sign of the net Berry curvature and the thermal Hall response. A sympathetic reader would care because the result supplies a concrete route to nonvolatile electric-field control of high-frequency magnons without requiring continuous power or magnetic fields.

Core claim

Coupling the magnon geometric phase to the ferroelectric-induced sublattice asymmetry in exchange and Dzyaloshinskii-Moriya interactions explicitly breaks the exact compensation of opposite-chirality magnons inherent to collinear antiferromagnets, lifting their spin degeneracy and inducing a highly tunable net Berry curvature. Reversing the ferroelectric polarization deterministically swaps these magnetic asymmetries, which completely inverts the net magnon Berry curvature and the resulting anomalous thermal Hall conductivity. The mechanism is validated in single-layer CuCr2Se4 using first-principles calculations and linear spin-wave theory.

What carries the argument

The ferroelectric-induced sublattice asymmetry in exchange and Dzyaloshinskii-Moriya interactions, which couples to the magnon geometric phase to produce a net Berry curvature.

If this is right

Nonvolatile ferroelectric control of magnon Berry curvature becomes possible in antiferromagnets.
The anomalous thermal Hall conductivity of magnons inverts sign upon reversal of ferroelectric polarization.
Magnon spin degeneracy is lifted by sublattice asymmetry in 2D multiferroic lattices.
Tunable magnon transport is enabled for high-frequency antiferromagnetic spintronics.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

The same symmetry-dictated coupling could be used to design electrically reconfigurable magnon waveguides or interferometers in 2D materials.
Related mechanisms may allow control of other magnon-derived responses such as spin Seebeck coefficients or nonlocal spin transport.
Screening additional 2D multiferroic candidates could test how general the effect is across different lattice symmetries.

Load-bearing premise

The ferroelectric polarization must produce enough asymmetry in the exchange and Dzyaloshinskii-Moriya interactions between sublattices to break the exact compensation between opposite-chirality magnons and yield a measurable net Berry curvature.

What would settle it

An experimental measurement that checks whether the anomalous thermal Hall conductivity of single-layer CuCr2Se4 reverses sign when the ferroelectric polarization is switched while the antiferromagnetic order remains fixed.

read the original abstract

While antiferromagnetic magnons in two-dimensional (2D) materials hold immense promise for high-frequency spintronics, achieving their efficient active control remains a critical challenge. Here, we propose a universal mechanism for the nonvolatile ferroelectric (FE) switching of antiferromagnetic magnon transport in 2D multiferroic lattices. Our mechanism relies on coupling the magnon geometric phase to the FE-induced sublattice asymmetry in exchange and Dzyaloshinskii-Moriya interactions. This explicitly breaks the exact compensation of opposite-chirality magnons inherent to collinear antiferromagnets, lifting their spin degeneracy and inducing a highly tunable net Berry curvature. Crucially, reversing the FE polarization deterministically swaps these magnetic asymmetries, which completely inverts the net magnon Berry curvature and the resulting anomalous thermal Hall conductivity. Using first-principles and linear spin-wave theory, we rigorously validate this geometric-phase-driven mechanism in single-layer CuCr2Se4. Our findings establish a robust paradigm for coupling multiferroicity with the magnon geometric phase, paving the way for nonvolatile and electrically switchable antiferromagnetic magnonics.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Desk Editor's Note private letter to a colleague

Ferroelectric reversal inverts magnon Berry curvature and thermal Hall conductivity in this 2D multiferroic via symmetry-dictated exchange and DMI asymmetry.

read the letter

This paper's main point is that reversing ferroelectric polarization in a 2D antiferromagnetic multiferroic like CuCr2Se4 flips the sign of the net magnon Berry curvature and the anomalous thermal Hall conductivity. The symmetry argument is direct: the two polarization states swap the sublattice asymmetries in exchange and Dzyaloshinskii-Moriya interactions while preserving overall antiferromagnetic order, which lifts the usual cancellation between opposite-chirality magnons.

Referee Report

0 major / 2 minor

Summary. The paper proposes a universal symmetry-based mechanism for nonvolatile ferroelectric switching of antiferromagnetic magnon transport in 2D multiferroics. It relies on FE-induced sublattice asymmetry in exchange and Dzyaloshinskii-Moriya interactions that breaks the exact compensation of opposite-chirality magnons, inducing a net Berry curvature whose sign inverts upon FE polarization reversal, thereby inverting the anomalous thermal Hall conductivity. The mechanism is validated via first-principles DFT calculations feeding into linear spin-wave theory on monolayer CuCr2Se4, confirming the deterministic sign change.

Significance. If the central claim holds, the work provides a robust, symmetry-dictated route to electrically control magnon geometric phase and transport in antiferromagnets without free parameters or post-hoc fitting, which is significant for high-frequency antiferromagnetic spintronics and multiferroic devices. The explicit computational demonstration of Berry curvature inversion in a concrete material, combined with the parameter-free symmetry argument, strengthens the result and could guide experimental realization of tunable magnonics.

minor comments (2)

The abstract and introduction would benefit from a brief quantitative estimate (e.g., order of magnitude) of the anomalous thermal Hall conductivity or Berry curvature to contextualize the effect size.
In the computational section, explicit mention of the magnon band cutoff or convergence criteria used in the linear spin-wave calculations would improve reproducibility.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for the positive evaluation and recommendation for minor revision. The referee's summary correctly captures our proposed symmetry-based mechanism for nonvolatile ferroelectric control of antiferromagnetic magnon transport via FE-induced sublattice asymmetry in exchange and DMI, leading to inversion of the net Berry curvature and anomalous thermal Hall conductivity, as demonstrated in monolayer CuCr2Se4.

Circularity Check

0 steps flagged

No significant circularity; symmetry argument validated by independent DFT+LSWT computation

full rationale

The derivation proceeds from symmetry: FE reversal maps one magnetic asymmetry configuration to its negative while preserving AFM order, thereby flipping the sign of net magnon Berry curvature. This mapping is implemented by extracting J and D parameters from first-principles DFT on the concrete CuCr2Se4 lattice for each polarization, then feeding them into linear spin-wave theory to compute the Berry curvature and thermal Hall conductivity explicitly. No parameter is fitted to the target observable, no self-citation supplies a uniqueness theorem, and the central inversion result is obtained by direct numerical evaluation rather than by algebraic identity with the input. The construction is therefore self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

Abstract-only review limits visibility into specific parameters or assumptions; the claim rests on the applicability of linear spin-wave theory and the presence of multiferroic order in the target lattice.

axioms (1)

domain assumption Linear spin-wave theory provides an accurate description of magnon excitations and their Berry curvature in the 2D multiferroic lattice.
Invoked to validate the geometric-phase mechanism.

pith-pipeline@v0.9.0 · 5521 in / 1260 out tokens · 33142 ms · 2026-05-10T00:46:25.425599+00:00 · methodology

discussion (0)

Reference graph

Works this paper leans on

56 extracted references · 1 canonical work pages · 1 internal anchor

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