The effective mass and the g-factor of the strongly correlated 2D electron fluid. Evidence for a coupled-valley state in the systemM. 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 , 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 -2DES data of Shashkin et al. While g* is enhanced in , m* is enhanced in . 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