Tunable two-dimensional Dirac-Weyl semimetal phase induced by altermagnetism
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866908785763680256 |
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| author | Liu, Lizhou Sun, Qing-Feng Zhang, Ying-Tao |
| author_facet | Liu, Lizhou Sun, Qing-Feng Zhang, Ying-Tao |
| contents | We demonstrate a tunable Dirac-Weyl semimetal phase in two dimensions, realized by introducing in-plane d-wave altermagnetism into a Dirac system. This phase hosts both a central Dirac point and momentumseparated Weyl points connected by Fermi line edge states. The Weyl point positions--and thus the edge-state connectivity--can be continuously tuned by rotating the altermagnetic axis. In contrast, out-of-plane altermagnetism gaps part of the bulk spectrum while preserving a single Dirac point accompanied by chiral edge modes, as evidenced by quantized edge polarization. Our findings provide a tunable platform for manipulating Dirac-Weyl physics and topological edge transport in two dimensions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_17402 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Tunable two-dimensional Dirac-Weyl semimetal phase induced by altermagnetism Liu, Lizhou Sun, Qing-Feng Zhang, Ying-Tao Mesoscale and Nanoscale Physics We demonstrate a tunable Dirac-Weyl semimetal phase in two dimensions, realized by introducing in-plane d-wave altermagnetism into a Dirac system. This phase hosts both a central Dirac point and momentumseparated Weyl points connected by Fermi line edge states. The Weyl point positions--and thus the edge-state connectivity--can be continuously tuned by rotating the altermagnetic axis. In contrast, out-of-plane altermagnetism gaps part of the bulk spectrum while preserving a single Dirac point accompanied by chiral edge modes, as evidenced by quantized edge polarization. Our findings provide a tunable platform for manipulating Dirac-Weyl physics and topological edge transport in two dimensions. |
| title | Tunable two-dimensional Dirac-Weyl semimetal phase induced by altermagnetism |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2601.17402 |