Valley- and Spin-Dependent Electronic and Transport Properties of Two-Dimensional Altermagnetic Titanium-Based Chalcogenide Halides
Abstract
Altermagnets (AMs) combine fully compensated magnetization with momentum-dependent spin splitting, yet intrinsic altermagnetic materials exhibiting exceptional valley characteristics remain scarce. Here, we identify monolayer titanium-based chalcogenide halides, Ti2X2Y (X = F, Cl, Br, I; Y = O, S, Se, Te), as a new family of two-dimensional altermagnetic valley materials. These monolayers exhibit robust d-wave altermagnetic order, semiconducting band gaps, and pronounced spin-polarized valley characteristics. We show that uniaxial strain breaks the valley degeneracy, inducing giant valley polarization together with a tunable piezomagnetic response. An in-plane electric field generates noncollinear spin currents, while spin--orbit coupling gives rise to the anomalous Hall effect, valley-selective linear dichroism, and the magneto-optical Kerr effect. These findings establish Ti2X2Y monolayers as a versatile platform for exploring spin- and valley-dependent electronic, optical, and transport phenomena in two-dimensional altermagnets.
Versions
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BibTeX
@misc{ning2026valley,
title = {{Valley- and Spin-Dependent Electronic and Transport Properties of Two-Dimensional Altermagnetic Titanium-Based Chalcogenide Halides}},
author = {Ruo-Yu Ning and Zhi-Hua Yan and Jin-Yang Li and Yong-Kun Wang and Si Li},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2608.19734},
eprint = {2608.19734},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.19734},
}
RIS
TY - UNPB
TI - Valley- and Spin-Dependent Electronic and Transport Properties of Two-Dimensional Altermagnetic Titanium-Based Chalcogenide Halides
AU - Ruo-Yu Ning
AU - Zhi-Hua Yan
AU - Jin-Yang Li
AU - Yong-Kun Wang
AU - Si Li
PY - 2026
DA - 2026/09/14
PB - arXiv
DO - 10.48550/arxiv.2608.19734
UR - https://arxiv.org/abs/2608.19734
AB - Altermagnets (AMs) combine fully compensated magnetization with momentum-dependent spin splitting, yet intrinsic altermagnetic materials exhibiting exceptional valley characteristics remain scarce. Here, we identify monolayer titanium-based chalcogenide halides, Ti_2X_2Y (X = F, Cl, Br, I; Y = O, S, Se, Te), as a new family of two-dimensional altermagnetic valley materials. These monolayers exhibit robust d-wave altermagnetic order, semiconducting band gaps, and pronounced spin-polarized valley characteristics. We show that uniaxial strain breaks the valley degeneracy, inducing giant valley polarization together with a tunable piezomagnetic response. An in-plane electric field generates noncollinear spin currents, while spin--orbit coupling gives rise to the anomalous Hall effect, valley-selective linear dichroism, and the magneto-optical Kerr effect. These findings establish Ti_2X_2Y monolayers as a versatile platform for exploring spin- and valley-dependent electronic, optical, and transport phenomena in two-dimensional altermagnets.
ER -