O. Di Stefano et al., Beyond spatial averaging: Simulations of near-field scanning spectroscopy of quantum structures with interfacial roughness, PHYS REV B, 62(16), 2000, pp. 11071-11075
A theoretical approach for the simulation of scanning local optical spectro
scopy in disordered quantum structures is proposed. The local optical spect
ra at subwavelength resolution show the spectral lines from the lowest stat
es of the exciton center-of-mass motion located at the individual potential
minima as well as from the excited states that merge into quasicontinua ne
ar the potential barriers in agreement with the experimental findings. The
simulations show the crucial impact that spatial resolution may have on the
local spectra. When the spatial resolution is lowered many lines disappear
owing to destructive spatial interference of quantum states.