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Dynamic local field correction; density-density response function; density-density correlation function

We present here an approximate scheme to obtain the complex frequency-dependent local field correction,G (q, ω). Using the equation of motion approach we develop here a methodology from which the results obtained by earlier workers, for density-density response function of an electron gas, can be arrived at in a simple systematic manner. We study in detail an approximation made along the similar lines as Singwi and coworkers, which leads to a compact expression for a complex frequency-dependent local field correction. We give results for damping coefficient of long wavelength plasmons which depends on ImG(q, ω). The real and imaginary parts ofG(q, ω) as functions ofω for various values ofq are also calculated. The dynamic structure factorS(q, ω) is evaluated forq=1.6q_F and compared with earlier theoretical and experimental results.

Chayanika Shah¹ G Mukhopadhyay^{1 2}

1. Department of Physics, Indian Institute of Technology, Powai, Bombay - 400 076, India
2. International Centre for Theoretical Physics, P.O. Box 586, Miramare, Trieste - 34100, Italy

Published

May 1986

Manuscript received

22 July 1985

Manuscript revised

5 February 1986