Fermi-arc metals

Abstract

We predict a novel metallic state of matter that emerges in a Weyl-semimetal superstructure with spatially varying Weyl-node positions. In the new state, the Weyl nodes are stretched into extended, anisotropic Fermi surfaces, which can be understood as being built from Fermi arc-like states. This "Fermi-arc metal" exhibits the chiral anomaly of the parental Weyl semimetal. However, unlike in the parental Weyl semimetal, in the Fermi-arc metal the "ultra-quantum state", in which the anomalous chiral Landau level is the only state at the Fermi energy, is already reached for a finite energy window at zero magnetic field. The dominance of the ultra-quantum state implies a universal low-field ballistic magnetoconductance and the absence of quantum oscillations, making the Fermi surface "invisible" to de Haas-van Alphen and Shubnikov-de Haas effects, although it signifies its presence in other response properties.

7 pages, 3 figures

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Cited by in corpus (8)

• Three-dimensional flat Landau levels in an inhomogeneous acoustic crystal
• Magnetic Breakdown and Chiral Magnetic Effect at Weyl-Semimetal Tunnel Junctions
• Quantum Oscillation Signatures of Fermi Arcs in Tunnel Magnetoconductance
• Quantum description of Fermi arcs in Weyl semimetals in a magnetic field
• Tunnelling theory of Weyl semimetals in proximity to a metallic band
• Flat bands and multi-state memory devices from chiral domain wall superlattices in magnetic Weyl semimetals
• Axionic Instability of Periodic Weyl-Semimetal Superstructures
• Magnetotransport across Weyl semimetal grain boundaries