| 研究実績の概要 |
In accordance with the "Purpose of the research" and "Research plan" for this grant, in FY2023 we have developed a new sensitive transconductance amplifier to detect the Rydberg transition of electrons trapped on the surface of superfluid helium. The amplifier is based on a high-Q tank circuit, which converts the image current from electrons into a small voltage signal, followed by a cryogenic low-noise HEMT amplifier. The cryogenic testing of the amplifier demonstrated exceptionally good noise characteristics, with the voltage noise 0.6 nV per root Hz and the current noise 1.5 fA per root Hz (see publication list). Using this amplifier, we were able to demonstrate detection of the Rydberg resonance from about 100 electrons trapped in a microchannel device filled with supefluid helium.
|
