Quantized surface transport in topological Dirac semimetal films

Abstract

Unconventional surface states protected by non-trivial bulk orders are sources of various exotic quantum transport in topological materials. One prominent example is the unique magnetic orbit, so-called Weyl orbit, in topological semimetals where two spatially separated surface Fermi-arcs are interconnected across the bulk. The recent observation of quantum Hall states in Dirac semimetal Cd3As2 bulks have drawn attention to the novel quantization phenomena possibly evolving from the Weyl orbit. Here we report surface quantum oscillation and its evolution into quantum Hall states in Cd3As2 thin film samples, where bulk dimensionality, Fermi energy, and band topology are systematically controlled. We reveal essential involvement of bulk states in the quantized surface transport and the resultant quantum Hall degeneracy depending on the bulk occupation. Our demonstration of surface transport controlled in film samples also paves a way for engineering Fermi-arc-mediated transport in topological semimetals.

arXiv comment18 pages, 4 figures

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• Surface plasmon polaritons in strained Weyl semimetals
• Nonlinear magnetotransport in Weyl semimetal
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• Integer quantum Hall effect and enhanced g-factor in quantum confined Cd3As2 films
• Quantum Hall effect induced by chiral Landau levels in topological semimetal films
• Electric field manipulation of surface states in topological semimetals
• Two Types of 3D Quantum Hall Effects in Multilayer WTe${}_2$
• Quantum transport observed in films of magnetic topological semimetal EuSb${}_2$
• Doping-induced topological transition and enhancement of thermopower in the Dirac-semimetal system Cd${}_{3-x}$Zn${}_x$As${}_2$
• Controllable p$-$n junctions in three$-$dimensional Dirac semimetal Cd${}_3$As${}_2$ nanowires
• Long-range spin transport on the surface of topological Dirac semimetal
• Quantum description of Fermi arcs in Weyl semimetals in a magnetic field
• Enhancement of the Thermoelectric Figure of Merit in the Dirac Semimetal Cd${}_3$As${}_2$ by Band-Structure and -Filling Control
• Unconventional two-dimensional quantum oscillations in three-dimensional thick SrRuO${}_3$ films
• Edge and bulk states in Weyl-orbit quantum Hall effect as studied by Corbino measurements