Near-field wave-function spectroscopy of excitons and biexcitons

Details Near-field wave-function spectroscopy of excitons and biexcitons Near-field wave-function spectroscopy of excitons and biexcitons

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phrvb..71c5347r&link_type=abstract

Physical Review B, vol. 71, Issue 3, id. 035347

Physics

7

Quantum Dots, Near-Field Scanning Optical Microscopes, Excitons And Related Phenomena, Iii-V Semiconductors

Scientific paper

Improvements in spatial resolution of near-field spectroscopy have recently allowed for wave-function imaging of single excitons and biexcitons localized in semiconductor quantum wells. Surprisingly, the apparent extent of the biexciton wave function was found to be considerably reduced compared to a single exciton. We analyze theoretically the image contrast in general near-field wave-function mapping, taking into account the finite spatial resolution of the experiment. In particular, we show that due to the nonlinear nature of biexciton spectroscopy, a smaller biexciton image size is expected even if the spatial resolution is insufficient to resolve the wave functions.

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