Dopant Engineering of Inter-Subband Linewidth and Lineshape in Multiwell Heterostructures

Abstract:
We show by numerical diagonalization of the electronic Hamiltonian including screened coulombic impurities that the inter-subband absorption lineshape and linewidth in heterostructures can be controlled by a suitable location of the dopants. We also point out that the usual optical conductivity calculations that employ the self-consistent Born approximation often lead to incorrect lineshapes, although the trends for the linewidths versus the dopant location are the same as found in the present numerical approach. (c) 2013 The Japan Society of Applied Physics