Heating of a two-dimensional electron gas by the electric field of a surface acoustic wave

Details Heating of a two-dimensional electron gas by the electric field of a surface acoustic wave Heating of a two-dimensional electron gas by the electric field of a surface acoustic wave

1998-02-21

arxiv.org/abs/cond-mat/9802231v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

some technical corrections for pictures were made

Scientific paper

The heating of a two-dimensional electron gas by an rf electric field generated by a surface acoustic wave, which can be described by an electron temperature $T_e$, has been investigated. It is shown that the energy balance of the electron gas is determined by electron scattering by the piezoelectric potential of the acoustic phonons with $T_e$ determined from measurements at frequencies $f$= 30 and 150 MHz. The experimental curves of the energy loss $Q$ versus $T_e$ at different SAW frequencies depend on the value of $\omega \bar{\tau}_{\epsilon}$, compared to 1, where $ \bar {\tau}_{\epsilon}$ is the relaxation time of the average electron energy. Theoretical calculations of the heating of a two-dimensional electron gas by the electric field of the surface acoustic wave are presented for the case of thermal electrons ($\Delta T \ll T$). The calculations show that for the same energy losses $Q$ the degree of heating of the two-dimensional electrons (i.e., the ratio $T_e/T$) for $\omega \bar{\tau}_{\epsilon}>1$ ($f$= 150 MHz) is less than for $\omega \bar{\tau}_{\epsilon}<1$ ($f$=30 MHz). Experimental results confirming this calculation are presented.

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