Signatures of a surface spin–orbital chiral metal

Federico Mazzola (), Wojciech Brzezicki, Maria Teresa Mercaldo, Anita Guarino, Chiara Bigi, Jill A. Miwa, Domenico Fazio, Alberto Crepaldi, Jun Fujii, Giorgio Rossi, Pasquale Orgiani, Sandeep Kumar Chaluvadi, Shyni Punathum Chalil, Giancarlo Panaccione, Anupam Jana, Vincent Polewczyk, Ivana Vobornik, Changyoung Kim, Fabio Miletto-Granozio, Rosalba Fittipaldi, Carmine Ortix, Mario Cuoco () and Antonio Vecchione ()
Additional contact information
Federico Mazzola: Ca’ Foscari University of Venice
Wojciech Brzezicki: Jagiellonian University
Maria Teresa Mercaldo: Università di Salerno
Anita Guarino: Istituto SPIN, Consiglio Nazionale delle Ricerche
Chiara Bigi: Synchrotron SOLEIL
Jill A. Miwa: Aarhus University
Domenico Fazio: Ca’ Foscari University of Venice
Alberto Crepaldi: Politecnico di Milano
Jun Fujii: Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche
Giorgio Rossi: Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche
Pasquale Orgiani: Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche
Sandeep Kumar Chaluvadi: Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche
Shyni Punathum Chalil: Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche
Giancarlo Panaccione: Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche
Anupam Jana: Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche
Vincent Polewczyk: Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche
Ivana Vobornik: Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche
Changyoung Kim: Seoul National University
Fabio Miletto-Granozio: Istituto SPIN, Consiglio Nazionale delle Ricerche
Rosalba Fittipaldi: Istituto SPIN, Consiglio Nazionale delle Ricerche
Carmine Ortix: Università di Salerno
Mario Cuoco: Istituto SPIN, Consiglio Nazionale delle Ricerche
Antonio Vecchione: Istituto SPIN, Consiglio Nazionale delle Ricerche

Nature, 2024, vol. 626, issue 8000, 752-758

Abstract: Abstract The relation between crystal symmetries, electron correlations and electronic structure steers the formation of a large array of unconventional phases of matter, including magneto-electric loop currents and chiral magnetism1–6. The detection of such hidden orders is an important goal in condensed-matter physics. However, until now, non-standard forms of magnetism with chiral electronic ordering have been difficult to detect experimentally7. Here we develop a theory for symmetry-broken chiral ground states and propose a methodology based on circularly polarized, spin-selective, angular-resolved photoelectron spectroscopy to study them. We use the archetypal quantum material Sr2RuO4 and reveal spectroscopic signatures that, despite being subtle, can be reconciled with the formation of spin–orbital chiral currents at the surface of the material8–10. As we shed light on these chiral regimes, our findings pave the way for a deeper understanding of ordering phenomena and unconventional magnetism.

Date: 2024
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DOI: 10.1038/s41586-024-07033-8

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