title: Quantum oscillations from generic surface Fermi arcs and bulk chiral modes in Weyl semimetals.
abstract: We re-examine the question of quantum oscillations from surface Fermi arcs and chiral modes in Weyl semimetals. By introducing two tools--semiclassical phase-space quantization and a numerical implementation of a layered construction of Weyl semimetals--we discover several important generalizations to previous conclusions that were implicitly tailored to the special case of identical Fermi arcs on top and bottom surfaces. We show that the phase-space quantization picture fixes an ambiguity in the previously utilized energy-time quantization approach and correctly reproduces the numerically calculated quantum oscillations for generic Weyl semimetals with distinctly curved Fermi arcs on the two surfaces. Based on these methods, we identify a 'magic' magnetic-field angle where quantum oscillations become independent of sample thickness, with striking experimental implications. We also analyze the stability of these quantum oscillations to disorder, and show that the high-field oscillations are expected to persist in samples whose thickness parametrically exceeds the quantum mean free path.
authors.affiliation: Department of Physics, Stanford University, Stanford, California 94305, USA.
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Department of Physics, Stanford University, Stanford, California 94305, USA.
authors.forename: Daniel
authors.initials: D
authors.lastname: Bulmash
authors.affiliation: Department of Physics, Stanford University, Stanford, California 94305, USA.
authors.forename: Pavan
authors.initials: P
authors.lastname: Hosur
authors.affiliation: Department of Physics, University of California, Berkeley, California 94720, USA.
authors.forename: Andrew C
authors.initials: AC
authors.lastname: Potter
authors.affiliation: Department of Physics, University of California, Berkeley, California 94720, USA.
authors.forename: Ashvin
authors.initials: A
authors.lastname: Vishwanath