Showing papers by "Satish C. Sharma published in 1974"
TL;DR: In this paper, a modified collision term has been used to calculate the absorption coefficient of an acoustic wave for the case of acoustic-phonon scattering and an intermediate range of frequencies.
Abstract: It has been shown that the well-known Cohen-Harrison-Harrison (CHH) model of the collision term for electrons in a semiconductor with an acoustic wave is invalid for energy-dependent relaxation times. A modified collision term has been used to calculate the absorption coefficient of an acoustic wave. Our calculations show that for the case of acoustic-phonon scattering and an intermediate range of frequencies, i.e., $\frac{{v}_{s}}{{v}_{0}}l\mathrm{ql}l{v}_{0}{v}_{s}$ is ${v}_{0}$ is average thermal velocity and ${v}_{s}$ is the sound velocity), the values of the absorption coefficients are appreciably different from those obtained using the CHH model; in the two extreme limits, i.e., $\mathrm{ql}l\frac{{v}_{s}}{{v}_{0}}$ and $\mathrm{ql}g\frac{{v}_{0}}{{v}_{s}}$, we obtain some results similar to those using CHH model.
11 citations
TL;DR: In this paper, the authors proposed that the application of an external temperature gradient to a semiconductor can lead to the amplification of the acoustic wave, and they showed that the effect of external temperature gradients can be independent of the semiconductor properties.
Abstract: We propose that the application of an external temperature gradient to a semiconductor can lead to the amplification of the acoustic wave.
11 citations