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Multiple Dirac nodes and symmetry protected Dirac nodal line in orthorhombic α-RhSi

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Multiple Dirac nodes and symmetry protected Dirac nodal line in orthorhombic α-RhSi
Mozaffari, S. Aryal, N. Schönemann, R. Chen, K.-W. Zheng, W. McCandless, G.T. Chan, J.Y. Manousakis, E. Balicas, L.
scientific_publication_article
Επιστημονική δημοσίευση - Άρθρο Περιοδικού (EL)
Scientific publication - Journal Article (EN)
2020
Exotic multifold topological excitations have been predicted and were recently observed in transition metal silicides like β-RhSi. Herein, we report that interesting topological features of RhSi are also observed in its orthorhombic α phase, which displays multiple types of Dirac nodes very close to the Fermi level ÉF. We discuss the symmetry analysis, band connectivity along high-symmetry lines using group representations, band structure, the nature of the Dirac points and of a nodal line occurring near ÉF which is protected by the crystalline symmetry. The de Haas-van Alphen effect indicates a Fermi surface in agreement with the calculations. We find an elliptically shaped nodal line very close to ÉF around and near the S point on the ky-kz plane that results from the intersection of two upside-down Dirac cones. Both Dirac points of the participating Kramers degenerate bands are only 5 meV apart; hence, an accessible magnetic field might induce a crossing between the spin-up partner of the upper Dirac cone and the spin-down partner of the lower Dirac cone, possibly explaining the anomalies observed in the magnetic torque. α-RhSi is a unique system since all bands crossing ÉF emerge from Dirac nodes. © 2020 American Physical Society. (EN)
English
Ερευνητικό υλικό ΕΚΠΑ
https://creativecommons.org/licenses/by-nc/4.0/
University of Athens
Pergamos Digital Library
Journal Article



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