Abstract.
Direct illumination of the tunneling gap in an ultrahigh vacuum scanning tunneling microscope with ultrashort pump-probe laser pulses may offer ultimate spatial and temporal resolution in surface experiments. The electronic bandwidth of the tunneling gap (\(<\) 1 THz) does not limit the time resolution. Our experiments show that multiphoton photoelectron emission from the sample limits the application of this detection scheme at high laser fluence. However, a substrate specific pump-probe effect in the photoelectron yield with femtosecond transients is observed on Tantalum and on GaAs(110) surfaces.
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Received: 5 November 1996
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Pfeiffer, W., Sattler, F., Vogler, S. et al. Rapid communicationPhotoelectron emission in femtosecond laser assisted scanning tunneling microscopy . Appl. Phys. B 64, 265–268 (1997). https://doi.org/10.1007/s003400050173
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DOI: https://doi.org/10.1007/s003400050173