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

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

2003-04-01

arxiv.org/abs/cond-mat/0304034v2

Europhys. Lett., 63(5), pp. 660-666 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, version 2 of condmat/0304034, see http://nrcphy1.phy.nrc.ca/ims/qp/chandre/chnc/ Changs in the text, figur

Scientific paper

10.1209/epl/i2003-00593-6

The static local-field factor (LFF) of the 2-D electron fluid is calculated {\it nonperturbatively} using a mapping to a classical Coulomb fluid $\lbrack$Phys. Rev. Lett., {\bf 87}, 206$\rbrack$. The LFF for the paramagnetic fluid {\it differs markedly} from perturbation theory where a maximum near 2$k_F$ is expected. Our LFF has a quasi-linear small-k region leading to a maximum close to 3$k_F$, in agreent with currently available quantum Monte Carlo data. The structure in the LFF and its dependence on the density and temperature are interpretted as a signature of correlated scattering of electron pairs of opposite spin.The lack of structure at $2k_F$ implies weakened Friedel oscillations, Kohn anomalies etc.

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