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Main Authors: Gonzalez-Garcia, Alvaro, Lopez-Perez, William, Pacheco, Paola, Ramirez-Montes, Luz, Gonzalez-Hernandez, Rafael
Format: Preprint
Published: 2026
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Online Access:https://arxiv.org/abs/2604.26239
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author Gonzalez-Garcia, Alvaro
Lopez-Perez, William
Pacheco, Paola
Ramirez-Montes, Luz
Gonzalez-Hernandez, Rafael
author_facet Gonzalez-Garcia, Alvaro
Lopez-Perez, William
Pacheco, Paola
Ramirez-Montes, Luz
Gonzalez-Hernandez, Rafael
contents The interplay between unconventional magnetism and band topology in two-dimensional materials has emerged as an important theme in condensed matter physics. Here, we present first-principles calculations that reveal the coexistence of d-wave altermagnetism and topological behavior in Janus FeSeX (X = S, Te) monolayers. The chemical asymmetry of the Janus structure breaks both out-of-plane mirror and inversion symmetries, leading to anisotropic exchange interactions and momentum-dependent spin splittings even in the absence of spin-orbit coupling, the defining signature of altermagnetism. Phonon dispersion analyses confirm the dynamical stability of both compounds, while strain-dependent calculations demonstrate that the magnitude of the altermagnetic exchange splitting ($Δ_s$) can be efficiently tuned by biaxial strain. When spin-orbit coupling is included, a finite topological band gap emerges at the Fermi level, accompanied by quantized spin Hall conductivity plateaus and nontrivial topological invariants (spin Chern number = 1, Z2=1). These findings establish FeSeS and FeSeTe as promising two-dimensional platforms for realizing topological altermagnetism and spin--orbit--driven charge--spin conversion, thus opening new avenues for low-dissipation spintronic devices.
format Preprint
id arxiv_https___arxiv_org_abs_2604_26239
institution arXiv
publishDate 2026
record_format arxiv
spellingShingle Coexistence of d-Wave Altermagnetism and Topological States in Janus FeSeX (X = S, Te) Monolayers
Gonzalez-Garcia, Alvaro
Lopez-Perez, William
Pacheco, Paola
Ramirez-Montes, Luz
Gonzalez-Hernandez, Rafael
Materials Science
The interplay between unconventional magnetism and band topology in two-dimensional materials has emerged as an important theme in condensed matter physics. Here, we present first-principles calculations that reveal the coexistence of d-wave altermagnetism and topological behavior in Janus FeSeX (X = S, Te) monolayers. The chemical asymmetry of the Janus structure breaks both out-of-plane mirror and inversion symmetries, leading to anisotropic exchange interactions and momentum-dependent spin splittings even in the absence of spin-orbit coupling, the defining signature of altermagnetism. Phonon dispersion analyses confirm the dynamical stability of both compounds, while strain-dependent calculations demonstrate that the magnitude of the altermagnetic exchange splitting ($Δ_s$) can be efficiently tuned by biaxial strain. When spin-orbit coupling is included, a finite topological band gap emerges at the Fermi level, accompanied by quantized spin Hall conductivity plateaus and nontrivial topological invariants (spin Chern number = 1, Z2=1). These findings establish FeSeS and FeSeTe as promising two-dimensional platforms for realizing topological altermagnetism and spin--orbit--driven charge--spin conversion, thus opening new avenues for low-dissipation spintronic devices.
title Coexistence of d-Wave Altermagnetism and Topological States in Janus FeSeX (X = S, Te) Monolayers
topic Materials Science
url https://arxiv.org/abs/2604.26239