Correlation Energy and the Spin Susceptibility of the Two-Valley Two-dimensional Electron Gas

Details Correlation Energy and the Spin Susceptibility of the Two-Valley Two-dimensional Electron Gas Correlation Energy and the Spin Susceptibility of the Two-Valley Two-dimensional Electron Gas

2008-08-19

arxiv.org/abs/0808.2569v2

Phys. Rev. B 80, 035103 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 3 figures, accepted for publication in Phys. Rev. B

Scientific paper

We find that the spin susceptibility of a two-dimensional electron system with valley degeneracy does not grow critically at low densities, at variance with experimental results [A. Shashkin et al., Phys. Rev. Lett. 96, 036403 (2006)]. We ascribe this apparent discrepancy to the weak disorder present in experimental samples. Our prediction is obtained from accurate correlation energies computed with state of-the-art diffusion Monte Carlo simulations and fitted with an analytical expression which also provides a local spin density functional for the system under investigation.

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