Fig. 1: Quantum Hall signature of topological surface orbits.
From: Intrinsic coupling between spatially-separated surface Fermi-arcs in Weyl orbit quantum Hall states
a Conventional topological-insulator-like (TI-like) surface orbits independently localized on each film surface. b A pair of Weyl orbits connecting the top and bottom surface states via the bulk chiral modes. c, d Expected appearance pattern of quantum Hall states for TI-like surface orbits (c) and for doubly degenerate Weyl orbits (d) in a Dirac semimetal film. e Capacitive coupling of carrier density for each surface orbit (n1, n2) to the top and back-gate voltages (VTG and VBG) as defined in Eq. (3). While the two surface orbits in the TI-like case are decoupled and C12/C11 decreases to 0 as the film thickness t increases21 (black dashed line), the carrier density of the paired Weyl orbits is expected to be modulated simultaneously by both VTG and VBG (C12/C11 = 1) independent of the film thickness (red dashed line). The inset is a schematic illustration of the dual-gate configuration fabricated on the (Cd1−xZnx)3As2 film, where electrons are depleted when VTG (VBG) < 0.
