Topological Hall plateau in quasi-2D kagome magnet YMn6Sn6
Abstract
We examine the impact of the Dzyaloshinskii--Moriya interaction (DMI) in kagome magnets and show that a predominantly planar DMI together with ferromagnetic exchange stabilizes a disordered skyrmion phase in quasi-two-dimensional (2D) YMn6Sn6. Within an {\it{ab initio}} framework combining density functional theory and spin-dynamics simulations, we generate realistic spin textures of disordered skyrmion and find that this phase persists for Bext ≤ 0.5~T, with a decreasing skyrmion size as magnetic field increases. We demonstrate the emergence of topological Hall plateau in the range −0.5 ≤ Bext ≤ 0.5~T, driven by nearly uniform scalar spin chirality and the resulting constant real-space Berry curvature. This response is anti-symmetric with magnetic field while magnitude and sign of these plateau are determined by a complex interplay between Hund's coupling strength and chemical potential signifying the role of Dirac points and van Hove singularities. In addition, we reveal topological magnon excitations in the disordered skyrmion phase of quasi-2D YMn6Sn6.
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BibTeX
@misc{jena2026topological,
title = {{Topological Hall plateau in quasi-2D kagome magnet YMn$_6$Sn$_6$}},
author = {Sambit Jena and Nastaran Salehi and Manuel Pereiro Lopez and Olle Eriksson and Narayan Mohanta and Karthik V Raman and Tanay Nag and Banasree Sadhukhan},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2607.00150},
eprint = {2607.00150},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2607.00150},
}
RIS
TY - UNPB
TI - Topological Hall plateau in quasi-2D kagome magnet YMn_6Sn_6
AU - Sambit Jena
AU - Nastaran Salehi
AU - Manuel Pereiro Lopez
AU - Olle Eriksson
AU - Narayan Mohanta
AU - Karthik V Raman
AU - Tanay Nag
AU - Banasree Sadhukhan
PY - 2026
DA - 2026/09/11
PB - arXiv
DO - 10.48550/arxiv.2607.00150
UR - https://arxiv.org/abs/2607.00150
AB - We examine the impact of the Dzyaloshinskii--Moriya interaction (DMI) in kagome magnets and show that a predominantly planar DMI together with ferromagnetic exchange stabilizes a disordered skyrmion phase in quasi-two-dimensional (2D) YMn_6Sn_6. Within an {\it{ab initio}} framework combining density functional theory and spin-dynamics simulations, we generate realistic spin textures of disordered skyrmion and find that this phase persists for B_ext ≤ 0.5~T, with a decreasing skyrmion size as magnetic field increases. We demonstrate the emergence of topological Hall plateau in the range −0.5 ≤ B_ext ≤ 0.5~T, driven by nearly uniform scalar spin chirality and the resulting constant real-space Berry curvature. This response is anti-symmetric with magnetic field while magnitude and sign of these plateau are determined by a complex interplay between Hund's coupling strength and chemical potential signifying the role of Dirac points and van Hove singularities. In addition, we reveal topological magnon excitations in the disordered skyrmion phase of quasi-2D YMn_6Sn_6.
ER -