Low Temperature Physics: 34, 377 (2008); https://doi.org/10.1063/1.2911657 (8 pages)
Fizika Nizkikh Temperatur: Volume 34, Number 4-5 (April 2008), p. 470-479    ( to contents , go back )

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
pos Анотація:

Received October 26, 2007

Abstract

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.

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