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arXiv · 2507.15429

Anomalous charge density wave in altermagnetism

Zi-Hao Ding·Lei Wang·Zhen-Feng Ouyang·Jingsi Qiao·Ze-Feng Gao·Wei Ji·Kai Liu·Peng-Jie Guo·Zhong-Yi Lu
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Abstract

Exploring the intricate interplay between magnetism and charge density waves has long been a fundamental pursuit at the forefront of condensed matter research. In this letter, based on symmetry analysis and first-principles calculations, we propose for the first time that anomalous charge density wave can be realized in two-dimensional altermagnetic WO. The anomalous charge density wave is characterized by three key features: (i) Unlike conventional charge density wave, whose stabilization is driven by the opening of a gap near the Fermi level, the anomalous charge density wave is stabilized by the occupied states with energies shifting lower far away from the Fermi level; (ii) the anomalous charge density wave increases the density of states near the Fermi level and then enhances-rather than diminishes-the metallicity of materials; (iii) altermagnetism plays a crucial role in stabilizing anomalous charge density wave. Thus, our work offers a pathway for exploring both the realization and the underlying mechanisms of anomalous charge density waves in magnetic systems.

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Zi-Hao Ding, Lei Wang, Zhen-Feng Ouyang, Jingsi Qiao, Ze-Feng Gao, Wei Ji, Kai Liu, Peng-Jie Guo, Zhong-Yi Lu. 2025-07-21. Anomalous charge density wave in altermagnetism. https://arxiv.org/abs/2507.15429

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