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.
@article{arxiv.2507.15429,
title = {Anomalous charge density wave in altermagnetism},
author = {Zi-Hao Ding and Lei Wang and Zhen-Feng Ouyang and Jingsi Qiao and Ze-Feng Gao and Wei Ji and Kai Liu and Peng-Jie Guo and Zhong-Yi Lu},
journal= {arXiv preprint arXiv:2507.15429},
year = {2025}
}