Intrinsic coupling between spatially-separated surface Fermi-arcs in Weyl orbit quantum Hall states

Shinichi Nishihaya, Masaki Uchida (), Yusuke Nakazawa, Markus Kriener, Yasujiro Taguchi and Masashi Kawasaki
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Shinichi Nishihaya: University of Tokyo
Masaki Uchida: University of Tokyo
Yusuke Nakazawa: University of Tokyo
Markus Kriener: RIKEN Center for Emergent Matter Science (CEMS)
Yasujiro Taguchi: RIKEN Center for Emergent Matter Science (CEMS)
Masashi Kawasaki: University of Tokyo

Nature Communications, 2021, vol. 12, issue 1, 1-6

Abstract: Abstract Topological semimetals hosting bulk Weyl points and surface Fermi-arc states are expected to realize unconventional Weyl orbits, which interconnect two surface Fermi-arc states on opposite sample surfaces under magnetic fields. While the presence of Weyl orbits has been proposed to play a vital role in recent observations of the quantum Hall effect even in three-dimensional topological semimetals, actual spatial distribution of the quantized surface transport has been experimentally elusive. Here, we demonstrate intrinsic coupling between two spatially-separated surface states in the Weyl orbits by measuring a dual-gate device of a Dirac semimetal film. Independent scans of top- and back-gate voltages reveal concomitant modulation of doubly-degenerate quantum Hall states, which is not possible in conventional surface orbits as in topological insulators. Our results evidencing the unique spatial distribution of Weyl orbits provide new opportunities for controlling the novel quantized transport by various means such as external fields and interface engineering.

Date: 2021
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DOI: 10.1038/s41467-021-22904-8

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