Speaker: Wojciech Brzezicki (Jagiellonian University, Kraków, host: Imre Hagymási)
Title: Multipolar current phases in correlated systems
Date: Tuesday 29. September, 10:00
Place: KFKI Campus, Bldg. 1, Conference room,
Abstract:
We unveil signatures of multipolar current phases in kagome CsTi₃Bi₅ and layered perovskite Sr₂RuO₄. 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, and verified for stability, 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.
References:
[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, M.T. Mercaldo, A. Guarino, C. Bigi, J.A. Miwa, D. De Fazio, A. Crepaldi, J. Fujii, G. Rossi, P. Orgiani, S. K. Chaluvadi, S. P. Chalil, G. Panaccione, A. Jana, V. Polewczyk, I. Vobornik, C. Kim, F. Miletto-Granozio, R. Fittipaldi, C. Ortix, M. Cuoco, A. Vecchione, Signatures of a surface spin-orbital chiral metal, Nature 626, 752 (2024).
I acknowledge support from the National Science Centre (NCN, Poland) under Project No. 2021/43/B/ST3/02166
