Figure 3

ARPES spectra near point.

(a) ARPES spectra of 30 nm Bi(111)/Bi₂Te₃ film and (b) ARPES spectra of 20 nm Bi(111)/Bi₂Te₃ film along -- near point. The incident photon energy hν = 30 eV. Green dash lines mark bulk valence band. (c) Black and red lines are EDCs of 30nm Bi at point and of Au. An energy gap was observed. (d) Black and and red lines are EDCs of 20 nm Bi at point and of Au. There is no energy gap.