Abstract
We report on magnetoconductivity measurements of electrons on helium exposed to resonant microwave irradiation within the temperature range associated with electron-ripplon scattering. Our findings reveal a non-monotonic temperature dependence of the intersubband frequency, with an abrupt decrease observed at temperatures below 0.3 K. We attribute this unexpected energy levels shift to the adsorption of 3He impurities near the liquid helium surface at low temperatures and such behavior is consistent with recent theoretical calculations of the surface electron energy spectra on 3He-4He mixtures.
| Original language | English |
|---|---|
| Pages (from-to) | 955-960 |
| Number of pages | 6 |
| Journal | Low Temperature Physics |
| Volume | 49 |
| Issue number | 8 |
| DOIs | |
| State | Published - Aug 1 2023 |
Funding
We thank Alexei Chepelianskii, Vitalii Syvokon, Sviatoslav Sokolov, and Josh Pierce for valuable discussions. KN expresses sincere gratitude to Sviatoslav Sokolov for providing invaluable guidance, mentorship, and unwavering support throughout his academic journey. The experimental data were obtained by the Quantum Condensed Phases Research Team, RIKEN CEMS, Japan. This work is supported by National Science and Technology Council, Taiwan (grant No. MOST 111-2112-M-A49-030-). This research used resources at the High Flux Isotope Reactor, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. This manuscript has been authored in part by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The publisher acknowledges the US government license to provide public access under the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ).
Keywords
- electron energy spectrum
- frequency shift.
- liquid helium surface
- two-dimensional electron system