Browsing by Author "Jungwirth, Tomáš"

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    Different types of spin currents in the comprehensive materials database of nonmagnetic spin Hall effect
    (London : Nature Publ. Group, 2021) Zhang, Yang; Xu, Qiunan; Koepernik, Klaus; Rezaev, Roman; Janson, Oleg; Železný, Jakub; Jungwirth, Tomáš; Felser, Claudia; van den Brink, Jeroen; Sun, Yan
    Spin Hall effect (SHE) has its special position in spintronics. To gain new insight into SHE and to identify materials with substantial spin Hall conductivity (SHC), we performed high-precision high-throughput ab initio calculations of the intrinsic SHC for over 20,000 nonmagnetic crystals. The calculations revealed a strong relationship between the magnitude of the SHC and the crystalline symmetry, where a large SHC is typically associated with mirror symmetry-protected nodal line band structures. This database includes 11 materials with an SHC comparable to or even larger than that of Pt. Materials with different types of spin currents were additionally identified. Furthermore, we found that different types of spin current can be obtained by rotating applied electrical fields. This improves our understanding and is expected to facilitate the design of new types of spin-orbitronic devices.
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    Observation of a spontaneous anomalous Hall response in the Mn5Si3 d-wave altermagnet candidate
    ([London] : Springer Nature, 2024) Reichlova, Helena; Lopes Seeger, Rafael; González-Hernández, Rafael; Kounta, Ismaila; Schlitz, Richard; Kriegner, Dominik; Ritzinger, Philipp; Lammel, Michaela; Leiviskä, Miina; Birk Hellenes, Anna; Olejník, Kamil; Petřiček, Vaclav; Doležal, Petr; Horak, Lukas; Schmoranzerova, Eva; Badura, Antonín; Bertaina, Sylvain; Thomas, Andy; Baltz, Vincent; Michez, Lisa; Sinova, Jairo; Goennenwein, Sebastian T. B.; Jungwirth, Tomáš; Šmejkal, Libor
    Phases with spontaneous time-reversal (T) symmetry breaking are sought after for their anomalous physical properties, low-dissipation electronic and spin responses, and information-technology applications. Recently predicted altermagnetic phase features an unconventional and attractive combination of a strong T-symmetry breaking in the electronic structure and a zero or only weak-relativistic magnetization. In this work, we experimentally observe the anomalous Hall effect, a prominent representative of the T-symmetry breaking responses, in the absence of an external magnetic field in epitaxial thin-film Mn5Si3 with a vanishingly small net magnetic moment. By symmetry analysis and first-principles calculations we demonstrate that the unconventional d-wave altermagnetic phase is consistent with the experimental structural and magnetic characterization of the Mn5Si3 epilayers, and that the theoretical anomalous Hall conductivity generated by the phase is sizable, in agreement with experiment. An analogy with unconventional d-wave superconductivity suggests that our identification of a candidate of unconventional d-wave altermagnetism points towards a new chapter of research and applications of magnetic phases.