Europhys. Lett.
Volume 74, Number 2, April 2006
Page(s) 313 - 319
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 22 March 2006
Europhys. Lett., 74 (2), pp. 313-319 (2006)
DOI: 10.1209/epl/i2006-10008-x

Single-molecule fluctuations in a tunnel junction: A study by scanning-tunnelling-microscopy-induced luminescence

K. Perronet1, G. Schull1, P. Raimond2 and F. Charra1

1  CEA Saclay DSM DRECAM SPCSI - F-91191 Gif-sur-Yvette Cedex, France
2  CEA Saclay DRT LITEN LCC, DSEN GENEC F-91191 Gif-sur-Yvette Cedex, France

received 3 January 2005; accepted in final form 28 February 2006
published online 22 March 2006

Time-resolved measurements are essential to understand dynamic processes. The property of a tunnel junction to emit light, even in a liquid, offers an optical route to study fast phenomena occurring in this model nanoscopic system. We apply time-correlated two-photon counting to the light emitted by a STM junction immersed in a liquid. We analyze the diffusion of a single molecule at room temperature with sub-nanosecond time resolution, and its influence on the tunnelling process.

73.20.Mf - Collective excitations (including excitons, polarons, plasmons and other charge-density excitations).
73.40.Gk - Tunneling.
78.47.+p - Time-resolved optical spectroscopies and other ultrafast optical measurements in condensed matter.

© EDP Sciences 2006