Sharp increase of the effective mass near the critical density in a metallic 2D electron system

Details Sharp increase of the effective mass near the critical density in a metallic 2D electron system Sharp increase of the effective mass near the critical density in a metallic 2D electron system

2001-11-25

arxiv.org/abs/cond-mat/0111478v2

Phys. Rev. B 66, 073303 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.66.073303

We find that at intermediate temperatures, the metallic temperature dependence of the conductivity \sigma(T) of 2D electrons in silicon is described well by a recent interaction-based theory of Zala et al. (Phys. Rev. B 64, 214204 (2001)). The tendency of the slope d\sigma/dT to diverge near the critical electron density is in agreement with the previously suggested ferromagnetic instability in this electron system. Unexpectedly, it is found to originate from the sharp enhancement of the effective mass, while the effective Lande g factor remains nearly constant and close to its value in bulk silicon.

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