Data from: Anomalous Landau quantization in intrinsic magnetic topological insulators

The intrinsic magnetic topological insulator, Mn(Bi1-xSbx)2Te4, has been
identified as a Weyl semimetal with a single pair of Weyl nodes in its
spin-aligned strong-field configuration. A direct consequence of the Weyl
state is the layer dependent Chern number, C. Previous reports in MnBi2Te4
thin films have shown higher states either by increasing the film
thickness or controlling the chemical potential. A clear picture of the
higher Chern states is still lacking as data interpretation is further
complicated by the emergence of surface-band Landau levels under magnetic
fields. Here, we report a tunable layer-dependent C = 1 state
with Sb substitution by performing a detailed analysis of the quantization
states in Mn(Bi1-xSbx)2Te4 dual-gated devices—consistent with calculations
of the bulk Weyl point separation in the doped thin films. The observed
Hall quantization plateaus for our thicker Mn(Bi1-xSbx)2Te4 films under
strong magnetic fields can be interpreted by a theory of surface and bulk
spin-polarised Landau level spectra in thin film magnetic topological
insulators.