Atomic-scale visualization of d-wave altermagnetism
Author: Fu, Daran
Affiliation: Tsinghua University
Type: Poster
Display Dates: 20.07.2026 - 21.07.2026
Board: MT-091
Altermagnetism is a newly discovered magnetic phase, distinct from traditional ferromagnetism and antiferromagnetism. It is characterized by the absence of net magnetization and simultaneous breaking of time-reversal symmetry. Although its momentum-space features have been identified, its unique rotational-symmetry breaking has not been directly visualized in real space. In this study, we employ scanning tunneling microscopy to reveal atomic-scale, real-space evidence of altermagnetism in CsV2Se2O. Using intrinsic spin defects as local probes, we observe signature symmetry breaking in the form of unidirectional electronic structures and elliptical charging rings, both reflecting the alternating spin texture. Furthermore, neighboring spin-defect lines exhibit opposite spins and long-range antiferromagnetic coupling, indicating a novel spin arrangement. This work shifts the focus from momentum-space detection to direct real-space observation of altermagnetism, providing new opportunities to investigate the interactions between this unconventional magnetic order and other quantum states.