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The spectroscopic resolution of tunneling measurements performed with ascanning tunneling microscope is ultimately limited by the temperature at whichthe experiment is performed. To take advantage of the potential highspectroscopic resolution associated with operating an STM in a dilutionrefrigerator we have designed a room temperature tunnel current amplifierhaving very small back-action on the tunnel contact and allowing to nearlyreach the predicted energy resolution. This design is a modification of thestandard op-amp based tip-biasing current-voltage converter which implementsdifferential 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.

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Room-temperature tunnel current amplifier and experimental setup for high resolution electronic spectroscopy in millikelvin scanning tunneling microscope experiments