Dresden 2026 – scientific programme

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O: Fachverband Oberflächenphysik

O 44: Scanning probe techniques: Method development – Poster

O 44.7: Poster

Tuesday, March 10, 2026, 14:00–16:00, P2

Cryogenic Band Pass Amplifier for measuring Atomic Shot Noise — •Benjamin Frölich, Kevin Hauser, Lebin Yu, Gleb Neplyakh, Ajla Karić, and Fabian D. Natterer — Department of Physics, University of Zurich, Winterthurerstrasse 190, CH-8057, Switzerland

Scanning tunneling microscopy provides access to the texture and correlation of charge carriers in quantum materials by listening to their characteristic shot noise signatures that reveal 1e and 2e charge quantization effects at the atomic scale. Previous studies introduced a band pass amplifier with center frequency of 3 MHz based on their in house made high electron mobility transistor (HEMT) and LC tank circuit to measure such shot noise. Here we build a similar band pass amplifier with a center frequency of 17 MHz based on a comercially available InP HEMT. Another goal is the evaluation of resonating circuits like the LC tank at cryogenic temperatures. We achieve 26 dB single stage amplification at liquid nitrogen temperatures. Simulations suggest a noise figure of < 0.12 dB. Experiments at even lower temperatures present challenges impacting implementation into the cryostat.

Keywords: Shot Noise; Band Pass Amplifier; Scanning Tunneling Microscopy; Scanning Tunneling Spectroscopy; Cryogenic Low Noise Amplifier