Quantum corrections to conductivity: from weak to strong localization

Details Quantum corrections to conductivity: from weak to strong localization Quantum corrections to conductivity: from weak to strong localization

2001-11-28

arxiv.org/abs/cond-mat/0111525v2

Phys. Rev. B 65, 235322 (2002)

Physics

Condensed Matter

Disordered Systems and Neural Networks

RevTex 4.0, 10 figures, 7 two-column pages

Scientific paper

10.1103/PhysRevB.65.235322

Results of detailed investigations of the conductivity and Hall effect in gated single quantum well GaAs/InGaAs/GaAs heterostructures with two-dimensional electron gas are presented. A successive analysis of the data has shown that the conductivity is diffusive for $k_F l=25-2$ and behaves like diffusive one for $k_F l=2-0.5$ down to the temperature T=0.4 K. It has been therewith found that the quantum corrections are not small at low temperature when $k_F l\simeq 1$. They are close in magnitude to the Drude conductivity so that the conductivity $\sigma$ becomes significantly less than $e^{2}/h$ (the minimal $\sigma$ value achieved in our experiment is about $3\times 10^{-8}\Omega^{-1}$ at $k_Fl\simeq 0.5$ and $T=0.46$ K). We conclude that the temperature and magnetic field dependences of conductivity in whole $k_Fl$ range are due to changes of quantum corrections.

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