The normalized in-plane magnetoconductivity of the dilute strongly interacting system of electrons in silicon MOSFET's scales with B/T for low densities in the insulating phase. Pronounced deviations occur at higher metallic-like densities, where a new energy scale kBΔ emerges which is not associated with either magnetic field or thermal effects. B/T scaling of the magnetoconductivity breaks down at the density n0 where the energy scale kBΔ vanishes, near or at the critical density nc for the apparent metal-insulator transition. The different behavior of the magnetoconductivity at low and high densities suggests the existence of two distinct phases.
@article{arxiv.cond-mat/0312218,
title = {Magnetoconductivity of Insulating Silicon Inversion Layers},
author = {Yeekin Tsui and S. A. Vitkalov and M. P. Sarachik and T. M. Klapwijk},
journal= {arXiv preprint arXiv:cond-mat/0312218},
year = {2007}
}