Setback modulation doping of HgTe-CdTe multiple quantum wells

Abstract
Photoassisted molecular beam epitaxy has been used to achieve the first setback modulation doping of HgTe-CdTe heterostructures. A 43 Å setback is found to yield a factor-of-2 increase of the mobility over any measured previously for intentionally doped samples, and an 81 Å setback leads to further enhancement of the mobility.