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25 April 2024 |
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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
; S. Thirupathaiah
; | | Date: |
10 Dec 2019 | | Abstract: | Most recent observation of topological Fermi arcs on the surface of manyfold
degenerate B20 systems, CoSi and RhSi, have attracted enormous research
interests. Although an 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. | | Source: | arXiv, 1912.4796 | | Services: | Forum | Review | PDF | Favorites | |
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