Conductivity of disordered 2D systems: from weak to strong localization

Grigori M. Minkov; Alexander V. Germanenko; O. E. Rut; A. A. Sherstobitov; B. N. Zvonkov; E. A. Uskova; A. A. Birukov

doi:10.1117/12.514546

11 June 2003 Conductivity of disordered 2D systems: from weak to strong localization

Grigori M. Minkov, Alexander V. Germanenko, O. E. Rut, A. A. Sherstobitov, B. N. Zvonkov, E. A. Uskova, A. A. Birukov

Proceedings Volume 5023, 10th International Symposium on Nanostructures: Physics and Technology; (2003) https://doi.org/10.1117/12.514546
Event: 2003 Chapter books, 2003, Bellingham, WA, United States

Abstract

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_Fl = 25 - 2.5. The absolute value of the quantum corrections for k_Fl = 2.5 at low temperature is not small, e.g., it is about 70% of the Drude conductivity at T = 0.46 K. For k_Fl < 2.5 the conductivity looks like diffusive one. The temperature and magnetic field dependences are qualitatively described within the framework of the self-consistent theory by Vollhardt and Wolfle. The interference correction is therewith close in magnitude to the Drude conductivity so that the conductivity σ becomes significantly less than e²/h. We conclude that the temperature and magnetic field dependences of conductivity in the whole studied k_Fl range are due to changes of quantum corrections and that transition to hopping conductivity occurs at lower conductivity value.

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Grigori M. Minkov, Alexander V. Germanenko, O. E. Rut, A. A. Sherstobitov, B. N. Zvonkov, E. A. Uskova, and A. A. Birukov "Conductivity of disordered 2D systems: from weak to strong localization", Proc. SPIE 5023, 10th International Symposium on Nanostructures: Physics and Technology, (11 June 2003); https://doi.org/10.1117/12.514546

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