Volume 104, Number 4, November 2013
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||17 December 2013|
Experimental study of energy relaxation of hot electrons on liquid helium-4
1 Quantum Dynamics Unit, Okinawa Institute of Science and Technology - Tancha 1919-1, Okinawa 904-0495, Japan
2 Low Temperature Physics Laboratory, RIKEN - Hirosawa 2-1, Wako 351-0198, Japan
3 RIKEN CEMS - Hirosawa 2-1, Wako 351-0198, Japan
Received: 9 October 2013
Accepted: 17 November 2013
We report an experimental investigation of energy relaxation of surface electrons on superfluid helium-4. Electrons are heated by resonant microwave radiation which excites electrons from the ground subband to the first excited subband. The conductivity of electrons is measured under applied microwave radiation and a change of conductivity due to the population of higher excited subbands is recorded. Experimental data are reproduced by numerical calculations, based on a theoretical model developed previously. Fitting calculated data to experimental data allows us to obtain information about energy relaxation of surface electrons. Our results support theoretical predictions for energy relaxation due to two-ripplon emission.
PACS: 73.20.-r – Electron states at surfaces and interfaces / 78.70.Gq – Microwave and radio-frequency interactions / 67.90.+z – Other topics in quantum fluids and solids (restricted to new topics in section 67)
© EPLA, 2013
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