Extended Data Fig. 3: Reflectivity spectra of quasicrystal D1 and 2D map of 1S exciton intensity.
From: Field-tunable valley coupling in a dodecagonal semiconductor quasicrystal
(a)Typical reflectivity spectra from the quasicrystal with no doping (top), with electron (middle), and with hole doping (bottom). Red dashed lines are fitting results of 1s exciton resonance. We use Lorentzian function with a phase shift as the fitting function. The grey vertical strip indicated the energy range used for 1s exciton intensity map in Fig. S3b. (b) A 2D reflectivity map as a function of top and bottom gates identifies the conditions under which the top (bottom) layer exhibits intrinsic (i), electron-doped (n), or hole-doped (p) as indicated by the first (second) index in the parenthesis. The two diagonal directions, marked by red arrows, allow independent control of doping density and an electric field to be perpendicular to the 2D layers. The color bar represents the 1S exciton intensity in reflectivity spectra.
