(a) The total HHG spectrum I rad (black dash line), interband polarization I rad pol (blue solid line), and intraband current I rad curr (red solid line) for coupled inter- and intraband dynamics, and pure interband HHG (green solid line) when the intraband motion is artificially switched off with field strength 1.3 V/Å and CEP = 0 . (b) The corresponding time-dependent population n C [ K ( t ) , t ] for coupled (blue line) and pure interband (green line) motion. The red dash and glaucous dot-dash lines in panel (b) shows the normalized electric field and vector potential, respectively. The blue dots on the curves in panel (b) denote moments when the electrons pass through the Γ point. Panels (c) and (d) are the same as panels (a) and (b) but for τ p = 10 T 0 . Panels (e) and (f) are the same as panels (a) and (b) but for τ p = 4 T 0 . Adapted from Ref. ^[51].