Fig. 5: Electronic structure as a function of hydrostatic pressure.

a–d Fat bands representing the Te-5p character for the trigonal structure at ambient conditions (a), the q = 1/5 structure (b), and the q = 1/6 structure (c, d). Band weights of the q = 1/5 and q = 1/6-phase were unfolded into the Brillouin zone of the trigonal structure. A magnification of the regions around the bulk Dirac point is shown in the insets. e The trigonal Brillouin zone (BZ) is depicted by green lines and the BZ of the monoclinic 1/6-phase by black lines and gray surfaces. All high-symmetry points refer to the trigonal BZ. f Total density of states (DOS) at ambient conditions (trigonal cell) and for the q = 1/6-phase at 6.5 GPa and 42 GPa. The green arrow indicates the shift of the dimer bonding states to lower energies with increasing pressure. g Comparison of the band structure along the q-direction of the 1/6-phase with the trigonal cell band structure.