Direct observation of antiferromagnetic parity violation in the electronic structure of Mn2Au. (19th October 2022)

• Record Type: Journal Article
• Authors: Fedchenko, O; Šmejkal, L; Kallmayer, M; Lytvynenko, Ya; Medjanik, K; Babenkov, S; Vasilyev, D; Kläui, M; Demsar, J; Schönhense, G; Jourdan, M; Sinova, J; Elmers, H J
• Is Part Of: Journal of physics. Volume 34:Number 42(2022)
• Publication Date: 2022-10-19
• Subjects: antiferromagnetic -- parity -- ARPES -- Mn2Au -- spintronics -- momentum microscopy -- magnetic linear dichroism; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/ac87e6
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: Using momentum microscopy with sub- µ m spatial resolution, allowing momentum resolved photoemission on individual antiferromagnetic domains, we observe an asymmetry in the electronic band structure, E ( k ) ≠ E ( − k ), in Mn2 Au. This broken band structure parity originates from the combined time and parity symmetry, P T, of the antiferromagnetic order of the Mn moments, in connection with spin–orbit coupling. The spin–orbit interaction couples the broken parity to the Néel order parameter direction. We demonstrate a novel tool to image the Néel vector direction, N, by combining spatially resolved momentum microscopy with ab-initio calculations that correlate the broken parity with the vector N .