Tunable two-dimensional Dirac-Weyl semimetal phase induced by altermagnetism

TL;DR

This paper introduces a tunable two-dimensional Dirac-Weyl semimetal phase achieved through in-plane altermagnetism, enabling control over Weyl point positions and topological edge states, with potential for advanced electronic applications.

Contribution

It presents a novel method to induce and tune Dirac-Weyl semimetal phases in 2D systems using altermagnetism, expanding the toolkit for topological material engineering.

Findings

Weyl points can be continuously tuned by rotating the altermagnetic axis.

Out-of-plane altermagnetism gaps the bulk spectrum but preserves a Dirac point.

Quantized edge polarization confirms chiral edge modes.

Abstract

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.