Time-correlations as a contrast mechanism in scanning-tunneling-microscopy-induced photon emission.
We have developed an experimental technique based on scanning-tunneling microscope (STM) which permits to record simultaneously topography, STM-induced photon emission and a map of two-photon auto-correlations for time resolutions down to the sub-nanosecond range. In the case of a gold surface at air, we show that the tip-induced luminescence exhibits a photon-bunching phenomenon at a 10-ns time scale which depends both on bias and on local topography. The photon bunching was exclusively observed at specific bumps of the surface.
Silly
Fabien
F
CEA-Saclay, Service de Physique et Chimie des Surfaces et Interfaces, DRECAM-SRSIM, Bat.462, F-91191 Gif-sur-Yvette Cedex, France.
Charra
Fabrice
F