Europhys. Lett.
Volume 63, Number 5, September 2003
Page(s) 660 - 666
Section General
Published online 01 November 2003
DOI: 10.1209/epl/i2003-00593-6
Europhys. Lett., 63 (5) , pp. 660-666 (2003)

Structure of the local-field factor of the 2D electron fluid. Possible evidence for correlated scattering of electron pairs

M. W. C. Dharma-wardana and F. Perrot

Institute of Microstructural Sciences, National Research Council of Canada Ottawa, Canada, K1A 0R6

(Received 13 June 2003; accepted 30 June 2003)

The static local-field factor (LFF) of the 2D electron fluid is calculated nonperturbatively using a mapping to a classical Coulomb fluid (Phys. Rev. Lett., 87 (2001) 206404). The LFF for the paramagnetic fluid differs markedly from perturbation theory where a peak near $2k_{\ab{F}}$ is expected. Our LFF has a quasi-linear small- k region leading to a peak close to $3k_{\ab{F}}$, in agreement with available quantum Monte Carlo data. The structure in the LFF and its dependence on the density and temperature are interpreted as a signature of correlated scattering of electron pairs of opposite spin. The lack of structure at $2k_{\ab{F}}$ implies weakened Friedel oscillations, Kohn anomalies, etc.

05.30.Fk - Fermion systems and electron gas.
71.10.-w - Theories and models of many-electron systems.
71.45.Gm - Exchange, correlation, dielectric and magnetic response functions, plasmons.

© EDP Sciences 2003