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Paper IPM / P / 7414  


Abstract:  
Motivated by a number of recent experimental studies we have revisited the problem of the microscopic calculation of the quasiparticle selfenergy and manybody effective mass enhancement in a twodimensional electron liquid. Our systematic study is based on the manybody local fields theory and takes advantage of the results of the most recent Diffusion Monte Carlo calculations of the static charge and spin response of the electron liquid. We report extensive calculations of both the real and imaginary parts of the quasiparticle selfenergy. We also present results for the manybody effective mass enhancement and the renormalization constant over an extensive range of electron density. In this respect we critically examine the relative merits of the onshell approximation versus the selfconsistent solution of the Dyson equation. We show that in the stronglycorrelated regime a solution of the Dyson equation proves necessary in order to obtain a well behaved effective mass. The inclusion of both charge and spindensity fluctuations beyond the Random Phase Approximation is indeed crucial to get reasonable agreement with recent measurements.
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