Electronic structure studies of FeSi: A chiral topological system

Susmita Changdar, S. Aswartham, Anumita Bose, Y. Kushnirenko, G. Shipunov, N. C. Plumb, M. Shi, Awadhesh Narayan, B. Büchner, and S. Thirupathaiah
Phys. Rev. B 101, 235105 – Published 1 June 2020
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Abstract

Most recent observations of topological Fermi arcs on the surface of manyfold degenerate B20 systems, CoSi and RhSi, have attracted enormous research interests. Although another isostructural system, FeSi, has been predicted to show bulk chiral fermions, it is yet to be clear theoretically and as well experimentally that whether FeSi possesses the topological surface Fermi arcs associated with the exotic chiral fermions in vicinity of the Fermi level. In this contribution, using angle-resolved photoemission spectroscopy (ARPES) and density functional theory (DFT), we present the low-energy electronic structure of FeSi. We further report the surface state calculations to provide insights into the surface band structure of FeSi near the Fermi level. Unlike in CoSi or RhSi, FeSi has no topological Fermi arcs near the Fermi level as confirmed both from ARPES and surface state calculations. Further, the ARPES data show spin-orbit coupling (SOC) band splitting of 40 meV, which is in good agreement with bulk band-structure calculations. We noticed an anomalous temperature-dependent resistivity in FeSi which can be understood through the electron-phonon interactions as we find a Debye energy of 80 meV from the ARPES data.

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  • Received 10 December 2019
  • Accepted 13 May 2020

DOI:https://doi.org/10.1103/PhysRevB.101.235105

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Susmita Changdar1, S. Aswartham2, Anumita Bose3, Y. Kushnirenko2, G. Shipunov2, N. C. Plumb4, M. Shi4, Awadhesh Narayan3, B. Büchner2, and S. Thirupathaiah1,2,*

  • 1Condensed Matter Physics and Material Sciences Department, S N Bose National Centre for Basic Sciences, Kolkata, West Bengal 700106, India
  • 2Leibniz Institute for Solid State Research, IFW Dresden, D-01171 Dresden, Germany
  • 3Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
  • 4Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.

  • *setti@bose.res.in

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Issue

Vol. 101, Iss. 23 — 15 June 2020

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