Quasiparticle self-energy of an electron liquid

Sudhakar Yarlagadda, Gabriele F. Giuliani

Giuseppe E. Santoro, Gabriele F. Giuliani

Göran Niklasson

H Suehiro, Y Ousaka, Hiroshi Yasuhara

The self-energy of an electron liquid is studied by including the infinite series of particle-hole and particle-particle ladder interactions beyond the RPA. The effects of these two local-field corrections on the quasiparticle dispersion, the chemical potential mu , the quasiparticle renormalisation factor z F and the effective-mass ratio m*/m have been numerically examined in the metallic density region.

Reza Asgari, B. Tanatar

Reza Asgari, B. Davoudi, Marco Polini +3 more

Motivated by a number of recent experimental studies we have revisited the problem of the microscopic calculation of the quasiparticle self-energy and many-body effective mass enhancement in an unpolarized two-dimensional electron liquid. Our systematic study is based on the many-body local field 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 self-energy. We also present results for the many-body effective mass enhancement and the renormalization constant over a broad range of electron densities. In this respect we critically examine the relative merits of the on-shell approximation, commonly used in weak coupling situations versus the actual self-consistent solution of the Dyson equation. We show that already for ${r}_{s}\ensuremath{\simeq}3$ and higher, a solution of the Dyson equation proves necessary in order to obtain a well-behaved effective mass. Finally we find confirmation that the inclusion of both charge- and spin-density fluctuations beyond the random phase approximation is indeed crucial to get reasonable agreement with recent measurements.