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26 April 2024 |
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Multiple Dirac Nodes and Symmetry Protected Dirac Nodal Line in Orthorhombic $alpha$-RhSi | | Shirin Mozaffari
; Niraj Aryal
; Rico Schönemann
; Kuan-Wen Chen
; Wenkai Zheng
; Gregory T. McCandless
; Julia Y. Chan
; Efstratios Manousakis
; Luis Balicas
; | | Date: |
7 Feb 2020 | | Abstract: | Owing to their chiral cubic structure, exotic multifold topological
excitations have been predicted and recently observed in transition metal
silicides like $eta$-RhSi. Herein, we report that the topological character
of RhSi is also observed in its orthorhombic $alpha$-phase which displays
multiple types of Dirac nodes very close to the Fermi level ($varepsilon_F$)
with the near absence of topologically trivial carriers. We discuss the
symmetry analysis, band connectivity along high-symmetry lines using group
representations, the band structure, and the nature of the Dirac points and
nodal lines occurring near $varepsilon_F$. The de Haas-van Alphen effect
(dHvA) indicates a Fermi surface in agreement with the calculations. We find an
elliptically-shaped nodal line very close to $varepsilon_F$ around and near
the $S$-point on the $k_y-k_z$ plane that results from the intersection of two
upside-down Dirac cones. The two 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. | | Source: | arXiv, 2002.3020 | | Services: | Forum | Review | PDF | Favorites | |
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