Correlations and Coherence at Different Scales (CCDS25)

We unveil signatures of multipolar current phases in layered perovskite Sr2RuO4 and kagome CsTi3Bi5 [1,2]. This is done using circularly polarized, spin-selective, angular-resolved photoelectron spectroscopy, which shows intriguing asymmetry between spin-up and spin-down signals. In both cases a multipolar, spin-orbital current phases are postulated to account for this effect as more conventional types of order must be excluded as incoherent with experiments. In both cases we develop description of the spin-dichroic signal by means of a tight-binding model with a special form of a time-reversal symmetry.

[1] F. Mazzola, W. Brzezicki,..., M. Cuoco, Anomalous spin-optical helical effect in Ti-based kagome metal, arXiv:2502.19589.
[2] F. Mazzola, W. Brzezicki,..., A. Vecchione, Signatures of a surface spin–orbital chiral metal , Nature 626, 752 (2024).