Abstract
Istituto Nazionale per la Fisica della Materia, Universita`di Messina, Salita Sperone 31, I-98166 Messina, Italy~Received 29 March 2000; revised manuscript received 4 May 2000!A theoretical approach for the simulation of scanning local optical spectroscopy in disordered quantumstructures is proposed. The local optical spectra at subwavelength resolution show the spectral lines from thelowest states of the exciton center-of-mass motion located at the individual potential minima as well as fromthe excited states that merge into quasicontinua near the potential barriers in agreement with the experimentalfindings. The simulations show the crucial impact that spatial resolution may have on the local spectra. Whenthe spatial resolution is lowered many lines disappear owing to destructive spatial interference of quantumstates.I. INTRODUCTION
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