Altermagnetism-induced higher-order topological Dirac semimetals in two-dimensional nonsymmorphic systems
Abstract
We propose an altermagnetism-induced route to a two-dimensional higher-order topological Dirac semimetal in a trilayer nonsymmorphic Dirac system. Interlayer hybridization preserves the nonsymmorphic bulk Dirac crossings and generates helical edge states in the trilayer phase. Introducing outer-layer d-wave altermagnetic order gaps the helical edge states, while only the symmetry-protected Dirac crossing at high-symmetry point M remains gapless. The resulting phase hosts a surviving bulk Dirac point, gapped edge spectra, and corner states. An exact layer-space decomposition further reveals that these features arise from the coexistence of a gapless Dirac sector and a gapped ℤ2 topological sector. Our results establish altermagnetism as an effective mechanism for engineering higher-order topological Dirac semimetals in two-dimensional nonsymmorphic systems.
Versions
Related
- Topological Splitting of Sondheimer Oscillations in Thin-Film Weyl Semimetals
- Nonlinearity-induced Topological Phase Transitions in One-dimensional Systems with Chiral Symmetry: A Real-Space Treatment
- Bipolarized Weyl semimetals and quantum crystal valley Hall effect in two-dimensional altermagnetic materials
- Collinear altermagnetism for 3D chiral higher-order topological insulators
- Electrically driven Rabi dynamics of magnetic-field-induced corner states in a two-dimensional topological insulator
BibTeX
@misc{liu2026altermagnetisminduced,
title = {{Altermagnetism-induced higher-order topological Dirac semimetals in two-dimensional nonsymmorphic systems}},
author = {Lizhou Liu and Cheng-Ming Miao and Ying-Tao Zhang and Qing-Feng Sun},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.04347},
eprint = {2611.04347},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.04347},
}
RIS
TY - UNPB
TI - Altermagnetism-induced higher-order topological Dirac semimetals in two-dimensional nonsymmorphic systems
AU - Lizhou Liu
AU - Cheng-Ming Miao
AU - Ying-Tao Zhang
AU - Qing-Feng Sun
PY - 2026
DA - 2026/11/03
PB - arXiv
DO - 10.48550/arxiv.2611.04347
UR - https://arxiv.org/abs/2611.04347
AB - We propose an altermagnetism-induced route to a two-dimensional higher-order topological Dirac semimetal in a trilayer nonsymmorphic Dirac system. Interlayer hybridization preserves the nonsymmorphic bulk Dirac crossings and generates helical edge states in the trilayer phase. Introducing outer-layer d-wave altermagnetic order gaps the helical edge states, while only the symmetry-protected Dirac crossing at high-symmetry point M remains gapless. The resulting phase hosts a surviving bulk Dirac point, gapped edge spectra, and corner states. An exact layer-space decomposition further reveals that these features arise from the coexistence of a gapless Dirac sector and a gapped ℤ_2 topological sector. Our results establish altermagnetism as an effective mechanism for engineering higher-order topological Dirac semimetals in two-dimensional nonsymmorphic systems.
ER -