Europhys. Lett.
Volume 67, Number 4, August 2004
Page(s) 552 - 558
Section General
Published online 01 August 2004
Europhys. Lett., 67 (4), pp. 552-558 (2004)
DOI: 10.1209/epl/i2004-10098-4

The effective mass and the g-factor of the strongly correlated 2D electron fluid. Evidence for a coupled-valley state in the $\chem{Si}$ system

M. W. C. Dharma-wardana

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

(Received 16 January 2004; accepted in final form 9 June 2004)

The effective mass m*, and the Landé g-factor of the uniform 2D electron system (2DES) are calculated as a function of the spin polarization $\zeta$, and the density parameter rs, using a non-perturbative analytic approach. Our theory is in good accord with the susceptibility data for the simple 2DES, and in excellent agreement with the two-valley $\chem{Si}$-2DES data of Shashkin et al. While g* is enhanced in $\chem{GaAs}$, m* is enhanced in $\chem{Si}$. The two-valley susceptibility is treated within a coupled-mode (coupled-valley) approach. The coupled-valley model is confirmed by comparison with the Quantum Monte Carlo results for a 4-component 2DES.

05.30.Fk - Fermion systems and electron gas.
71.27.+a - Strongly correlated electron systems; heavy fermions.
71.45.Gm - Exchange, correlation, dielectric and magnetic response functions, plasmons.

© EDP Sciences 2004