Physics – Instrumentation and Detectors
Scientific paper
2006-10-31
Review of Scientific Instruments 77 (12/2006) 123701
Physics
Instrumentation and Detectors
Available at http://www-spht.cea.fr/articles/s06/033
Scientific paper
10.1063/1.2400024
The spectroscopic resolution of tunneling measurements performed with a scanning tunneling microscope is ultimately limited by the temperature at which the experiment is performed. To take advantage of the potential high spectroscopic resolution associated with operating an STM in a dilution refrigerator we have designed a room temperature tunnel current amplifier having very small back-action on the tunnel contact and allowing to nearly reach the predicted energy resolution. This design is a modification of the standard op-amp based tip-biasing current-voltage converter which implements differential voltage sensing and whose back action on the tip voltage is only ~2 $\mu$V rms for a 14 MV/A transimpedance and 22 kHz bandwidth.
Joyez Philippe
Sueur H. le
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