Influence of the Characteristics of the STM-tip on the Electroluminescence Spectra

Details Influence of the Characteristics of the STM-tip on the Electroluminescence Spectra Influence of the Characteristics of the STM-tip on the Electroluminescence Spectra

2006-01-31

arxiv.org/abs/cond-mat/0601693v1

Physica E 27, 13 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

15 pages, 5 figures

Scientific paper

10.1016/j.physe.2004.10.002

We analyze the influence of the characteristics of the STM-tip (applied voltage, tip radius) on the electroluminescence spectra from an STM-tip-induced quantum dot taking into account the many-body effects. We find that positions of electroluminescence peaks, attributed to the electron-hole recombination in the quantum dot, are very sensitive to the shape and size of the confinement potential as determined by the tip radius and the applied voltage. A critical value of the tip radius is found, at which the luminescence peak positions as a function of the tip radius manifest a transition from decreasing behavior for smaller radii to increasing behavior for larger radii. We find that this critical value of the tip radius is related to the confinement in the lateral and normal direction.

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