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Title: Sensing Few Electrons Floating on Helium with High-Electron-Mobility Transistors

Journal Article · · Journal of Low Temperature Physics
 [1];  [1];  [1];  [2];  [2];  [2];  [3]
  1. Princeton University, NJ (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  3. Princeton University, NJ (United States); EeroQ Corporation, Chicago, IL (United States)

We report on low-frequency measurements of few electrons floating on superfluid helium using a bespoke cryogenic cascode amplifier circuit built with off-the-shelf GaAs high-electron-mobility transistors (HEMTs). We integrate this circuit with a charge-coupled device (CCD) to transport the electrons on helium and characterize its performance. Here, we show that this circuit has a signal-to-noise ratio (SNR) of ~ 2 $$\frac{e}{√Hz}$$ at 102 kHz, an order of magnitude improvement from previous implementations, and provides a compelling alternative to few electron sensing with high-frequency resonators.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
NA0003525; SC0012704; SC0020136
OSTI ID:
2585694
Report Number(s):
SAND--2025-09456J; 1755282
Journal Information:
Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 5-6 Vol. 219; ISSN 1573-7357; ISSN 0022-2291
Publisher:
Springer Science and Business Media LLCCopyright Statement
Country of Publication:
United States
Language:
English

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