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

Mozaffari, Shirin; Aryal, Niraj; Schönemann, Rico; Chen, Kuan-Wen; Zheng, Wenkai; McCandless, Gregory T.; Chan, Julia Y.; Manousakis, Efstratios; Balicas, Luis

doi:10.1103/physrevb.102.115131

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

Journal Article · Tue Sep 15 04:00:00 EDT 2020 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.102.115131· OSTI ID:1774085

^[1]; Aryal, Niraj ^[2]; Schönemann, Rico ^[2]; Chen, Kuan-Wen ^[2]; Zheng, Wenkai ^[2]; McCandless, Gregory T. ^[3]; Chan, Julia Y. ^[3]; Manousakis, Efstratios ^[4]; ^[2]

Florida State Univ., Tallahassee, FL (United States); Florida State University
Florida State Univ., Tallahassee, FL (United States)
Univ. of Texas at Dallas, Richardson, TX (United States)
Florida State Univ., Tallahassee, FL (United States); Univ. of Athens (Greece)

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 ε_F. Here, 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 ε_F 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 ε_F around and near the S point on the k_y-k_z 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 ε_F emerge from Dirac nodes.

View Accepted Manuscript (DOE)

Research Organization:: Florida State Univ., Tallahassee, FL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: SC0002613

OSTI ID:: 1774085

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 11 Vol. 102; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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