Microwave - Absorption - Induced Heating of Surface State Electrons on Liquid 3 He
نویسندگان
چکیده
A resonance-induced change in the resistivity of the surface state electrons (SSE) exposed to the microwave (MW) radiation is observed. The MW frequency corresponds to the transition energy between two lowest Rydberg energy levels. All measurements are done with electrons over liquid He in a temperature range 0.45−0.65 K, in which the electron relaxation time and the MW absorption linewidth are determined by collisions with helium vapor atoms. The input MW power is varied by two orders of magnitude, and the resistivity is always found to increase. This effect is attributed to the heating of electrons with the resonance MW radiation. The temperature and the momentum relaxation rate of the hot electrons are calculated as a function of the MW power in the cell, and the Rabi frequency is determined from the comparison of the theoretical result with the experiment. In addition, the broadening of the absorption signal caused by the heating is studied experimentally, and the results are found to be in good agreement with our calculations.
منابع مشابه
Microwave Absorption of Surface - State Electrons on Liquid 3 He
We have investigated the intersubband transitions of surface state electrons (SSE) on liquid He induced by microwave radiation at temperatures from 1.1 K down to 0.01 K. Above 0.4 K, the transition linewidth is proportional to the density of He vapor atoms. This proportionality is explained well by Ando’s theory, in which the linewidth is determined by the electron vapor atom scattering. Howeve...
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