Figure 2
From: Short-period scattering-assisted terahertz quantum cascade lasers operating at high temperatures
Population of each state in design-1 (a) and design-2 (b) at 230 K. It shows different cut-off energy under an operating bias condition (52 mV/period). The term “D: Full range” indicates the high-energy states 4, 5, 6, 7, 8 included in calculation.
