Fig. 1: Band structure of the top a-c surface.
From: Observation and control of the weak topological insulator state in ZrTe5
a Crystal structure of ZrTe5 and its cleavage planes. b The bulk Brillouin zone (BZ) and its projected surface BZ on the top a-c surface. c Fermi surface measured from the a-c surface, of which the range is indicated by the black box in b. d–e Band structure measured from the a-c surface with s and p-polarized light at 200 K, respectively. Light-yellow dashed lines in d highlight the band splitting around −0.1 eV. The red line in e shows the density of states (DOS). f Same as e, but normalized with its DOS for a clear presentation of the conduction band above Fermi level (EF), which will not affect the MDC peak positions. Details of the normalization can be found in Supplementary Fig. 2. g Band structure from first-principles slab calculations on the a-c surface. The blue box roughly indicates the momentum range in d–f. Orange dashed lines highlight the splitting similar to the one in d. h Temperature dependence of the band structure taken with p-polarized light. The black markers are extracted from MDC peaks, and the red solid lines are the fitting results of the black markers. The blue line with solid markers indicates the top of the valence band at different temperatures. The red dashed line marks the conductance band bottom at 200 K. Details of the band fitting can be found in “Methods” section.
