Fig. 2: ARPES spectra of Bi2Se3/Si(111) samples with different thicknesses.
From: Surface coupling in Bi2Se3 ultrathin films by screened Coulomb interaction
a–f are the ARPES spectra of the Bi2Se3 sample of 7, 6, 5, 4, 3, and 2 QL, respectively. The black dots are the peak positions fitted by MDCs and EDCs, while the red dot lines are the fitting results of black dots with massive or massless Dirac dispersion. \({E}_{{{{{{\rm{B}}}}}}}\) is the binding energy and \({k}_{{||}}\) is the in-plane wave vector.
