Low Temperature Physics: 34, 377 (2008); https://doi.org/10.1063/1.2911657 (8 pages)
Физика Низких Температур: Том 34, Выпуск 4-5 (Апрель 2008), c. 470-479    ( к оглавлению , назад )

Photoresonance and conductivity of surface electrons on liquid 3He

Denis Konstantinov1, Yuriy Monarkha1,2, and Kimitoshi Kono1

1Low Temperature Physics Laboratory, RIKEN, Hirosawa 2-1, Wako 351-0198, Japan
E-mail: konstantinov@riken.jp

2B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine

Received October 26, 2007


Resonance variations of the in-plane conductivity of surface electrons (SEs) over liquid 3He induced by microwave (MW) radiation of a fixed frequency are experimentally and theoretically studied for low temperature scattering regimes (T < 0.5 K). The system was tuned to resonance by varying the amplitude of the vertical electric field which shifts the positions of SE Rydberg levels. The line-shape change and reversing of the sign of the effect are found to be opposite to that reported previously for weak vertical electric fields. A theoretical analysis of conductivity of the SE system heated due to decay of electrons excited to the second Rydberg level by the MW explains well the line-shape variations observed. It shows also that shifting the MW resonance into the range of weak vertical fields leads to important qualitative changes in the line-shape of SE conductivity which are in agreement with observations reported previously.

PACS: 67.90.+z Other topics in quantum fluids and solids; liquid and solid helium;
PACS: 73.20.–r Electron states at surfaces and interfaces;
PACS: 73.25.+ i Surface conductivity and carrier phenomena;
PACS: 78.70.Gq Microwave and radio-frequency interactions.

Key words: liquid helium, surface electrons, microwave, resonance, conductivity.