Figure 2

(a) 240 K computed ionization rates of the Al_0.4Ga_0.07In_0.53As RA and the 4 ML InGaAs/AlInAs SL (b). Hot holes are marked in red, and electrons in black. Both show hot electron (E_th,e) and hole (E_th,g) threshold energies nearly equal to the energy gap (E_g).