Figure 2

The photon-dressed spectrum for the time-periodic gate voltage with Ac = 0 in (a,c), and for circularly polarized light with A0 = 0 in (b,d). In (a and b), we fix Ω = 2.5 and set (a) A0 = 0.4 and (b) Ac = 0.4 for off-resonant case. For resonant case, we fix Ω = 0.5 and set (c) A0 = 0.38 and (d) Ac = 0.2. The other parameters are the same as Fig. 1.