Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-07-07
Euro Physics Lett. vol 67, 552 (2004)
Physics
Condensed Matter
Strongly Correlated Electrons
New version#4 is the July 2004 published version (Europhysics Letters)
Scientific paper
10.1209/epl/i2004-10098-4
The effective mass m*, and the Lande g-factor of the uniform 2-D electron fluid (2DEF) are calculated as a function of the spin polarization zeta, and the density parameter r_s, using a non-perturbative analytic approach. Our theory is in good accord with the m*g* data of Zhu et al. for zeta=0 for the GaAs-2DEF, and striking agreement with the data of Shashkin et al for the Si-2DEF. While g* is enhanced in GaAs, m* is enhanced in Si. The latter arises from singlet-pair excitations in the two valleys forming a coupled-valley state occurring at the critical density of ~1.10^{11}$ e/cm^2.
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