Inspired by recent discovery of metallic d-wave altermagnetism in KV2Se2O, we develop a self-consistent microscopic many-body calculation of density-wave order for an itinerant altermagnetic metal. We show that the strong d-wave spin-momentum locking inherent to the altermagnetic band structure reconstructs the Fermi surface into spin-selective quasi-1D open sheets. This unique topology of Fermi surface drives an instability toward spin-resolved electronic charge density waves (CDWs), in which the ordering wave vectors for spin-up and spin-down electrons condense along two mutually orthogonal directions, forming spin-resolved stripe phases. As a consequence, this results in pronounced gap openings near the Fermi surface, and the superposition of these spin-resolved stripe orders leads to a checkerboard CDW in the charge channel and an antiphase spin-density-wave modulation in the spin channel. Upon increasing temperature, the density-wave order melts at Tc due to thermal phase fluctuation while the gap opening persists, giving rise to a robust pseudogap regime, which eventually closes at a higher temperature Tg. The resulting simulations quantitatively reproduce the key features observed in the spectroscopic measurements, offering a consistent and generic understanding of the reported phenomena in KV2Se2O and, more broadly, in metallic altermagnets with strong spin-momentum locking.
@article{arxiv.2602.11694,
title = {Emergent spin-resolved electronic charge density waves and pseudogap phenomena from strong $d$-wave altermagnetism},
author = {Fei Yang and Guo-Dong Zhao and Binghai Yan and Long-Qing Chen},
journal= {arXiv preprint arXiv:2602.11694},
year = {2026}
}