Amplifier for scanning tunneling microscopy at MHz frequencies.

  title={Amplifier for scanning tunneling microscopy at MHz frequencies.},
  author={Koen M. Bastiaans and Tjerk Benschop and Damianos Chatzopoulos and Doohee Cho and Quan Dong and Y. Jin and Milan P. Allan},
  journal={The Review of scientific instruments},
  volume={89 9},
Conventional scanning tunneling microscopy (STM) is limited to a bandwidth of a few kHz around DC. Here, we develop, build, and test a novel amplifier circuit capable of measuring the tunneling current in the MHz regime while simultaneously performing conventional STM measurements. This is achieved with an amplifier circuit including a LC tank with a quality factor exceeding 600 and a home-built, low-noise high electron mobility transistor. The amplifier circuit functions while simultaneously… 

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