Disorder and temperature renormalization of interaction contribution to the conductivity in two-dimensional In${}_x$Ga${}_{1-x}$As electron systems

Abstract

We study the electron-electron interaction contribution to the conductivity of two-dimensional In${}_{0.2}$Ga${}_{0.8}$As electron systems in the diffusion regime over the wide conductivity range, $\sigma \simeq (1-150)G_0$, where $G_0=e^2/(2{\pi }^2\hslash )$. We show that the data are well described within the framework of the one-loop approximation of the renormalization group (RG) theory when the conductivity is relatively high, $\sigma \gtrsim 15G_0$. At lower conductivity, the experimental results are found to be in drastic disagreement with the predictions of this theory. The theory predicts much stronger renormalization of the Landau's Fermi liquid amplitude, which controls the interaction in the triplet channel, than that observed experimentally. A further contradiction is that the experimental value of the interaction contribution does not practically depend on the magnetic field, whereas the RG theory forecasts its strong decrease due to decreasing diagonal component of the conductivity tensor in the growing magnetic field.

9 pages, 10 figures

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• Metal-Insulator Transition in 2D: Experimental Test of the Two-Parameter Scaling
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Cited by in corpus (4)

• Low magnetic field anomaly of the Hall effect in disordered 2D systems: Interplay between weak localization and electron-electron interaction
• Quantum corrections to conductivity of disordered electrons due to inelastic scattering off magnetic impurities
• Dephasing and interwell transitions in double quantum well heterostructures
• Interaction correction to the conductivity of two-dimensional electron gas in In${}_x$Ga${}_{1-x}$As/InP quantum well structure with strong spin-orbit coupling