A low density finite temperature apparent "insulating" phase in 2D systems

Details A low density finite temperature apparent "insulating" phase in 2D systems A low density finite temperature apparent "insulating" phase in 2D systems

2003-02-05

arxiv.org/abs/cond-mat/0302112v1

Phys. Rev. B 68, 195315 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 4 figures

Scientific paper

10.1103/PhysRevB.68.195315

We propose that the observed low density ``insulating'' phase of a 2D semiconductor system, with the carrier density being just below ($n < n_c$) the so-called critical density where the derivative of resistivity changes sign at low temperatures (i.e. resistivity $\rho(T)$ increases with increasing $T$ for $n > n_c$ whereas it decreases with increasing $T$ for $n < n_c$), is in fact a ``high-temperature'' crossover version of the same effective metallic phase seen at higher densities ($n>n_c$). This low density ($n

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