Observation of giant spin-split Fermi-arc with maximal Chern number in the chiral topological semimetal PtGa.

Abstract:

:Non-symmorphic chiral topological crystals host exotic multifold fermions, and their associated Fermi arcs helically wrap around and expand throughout the Brillouin zone between the high-symmetry center and surface-corner momenta. However, Fermi-arc splitting and realization of the theoretically proposed maximal Chern number rely heavily on the spin-orbit coupling (SOC) strength. In the present work, we investigate the topological states of a new chiral crystal, PtGa, which has the strongest SOC among all chiral crystals reported to date. With a comprehensive investigation using high-resolution angle-resolved photoemission spectroscopy, quantum-oscillation measurements, and state-of-the-art ab initio calculations, we report a giant SOC-induced splitting of both Fermi arcs and bulk states. Consequently, this study experimentally confirms the realization of a maximal Chern number equal to ±4 in multifold fermionic systems, thereby providing a platform to observe large-quantized photogalvanic currents in optical experiments.

journal_name

Nat Commun

journal_title

Nature communications

authors

Yao M,Manna K,Yang Q,Fedorov A,Voroshnin V,Valentin Schwarze B,Hornung J,Chattopadhyay S,Sun Z,Guin SN,Wosnitza J,Borrmann H,Shekhar C,Kumar N,Fink J,Sun Y,Felser C

doi

10.1038/s41467-020-15865-x

subject

Has Abstract

pub_date

2020-04-27 00:00:00

pages

2033

issue

1

issn

2041-1723

pii

10.1038/s41467-020-15865-x

journal_volume

11

pub_type

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