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.
@article{arxiv.2601.17402,
title = {Tunable two-dimensional Dirac-Weyl semimetal phase induced by altermagnetism},
author = {Lizhou Liu and Qing-Feng Sun and Ying-Tao Zhang},
journal= {arXiv preprint arXiv:2601.17402},
year = {2026}
}