Fig. 2: Electronic structure and Fermi surfaces.

a Band structure. The dashed black line indicates the Fermi level of pristine Pb7Bi4Se13. The orange and red dashed lines correspond to the Fermi levels of 0.05 electron- and 0.05 hole-doped Pb7Bi4Se13, respectively. b Electronic DOS projected onto s and p orbitals for each element. Fermi surfaces of c electron-doped Pb7Bi4Se13, and d hole-doped Pb7Bi4Se13.