Quantum Oscillations from Surface Fermi-Arcs in Weyl and Dirac Semi-Metals

Abstract

The surface states of Weyl semi-metals (SM's) consist of disjointed Fermi-arcs. This unusual surface-Fermiology provides a fingerprint of the topological features of the bulk Weyl-phase. Using a combination of semiclassical and numerical methods, we show that, in contrast to naive expectation, there are closed magnetic orbits involving the open- surface Fermi-arcs. Below a critical field strength that depends on sample thickness, these orbits produce periodic quantum oscillations of the density of states in a magnetic field, enabling a variety of experimental probes of the unconventional Fermi-arc surface states. The orbits are also essential for reproducing the bulk chiral anomaly in a finite slab. These results are then extended to the closely related and recently discovered 3D Dirac SM materials, including Cd3As2 and Na3Bi, which are doubled copies of Weyl semi-metals protected by crystal symmetry. Despite the fact that the protecting crystal symmetry is broken by a surface, we show that Dirac materials can still host unconventional surface-states, which can be detected in quantum oscillations experiments.

5 pages, 3 Figures, plus supplementary appendices

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