Interaction Effects in Conductivity of a Two-Valley Electron System in High-Mobility Si Inversion Layers

Abstract

We have measured the conductivity of high-mobility (001) Si metal-oxide-semiconductor field effect transistors (MOSFETs) over wide ranges of electron densities n=(1.8-15)x10^11cm^2, temperatures T=30mK-4.2K, and in-plane magnetic fields B=0-5T. The experimental data have been analyzed using the theory of interaction effects in the conductivity of disordered 2D systems. The parameters essential for comparison with the theory, such as the intervalley scattering time and valley splitting, have been measured or evaluated in independent experiments. The observed behavior of the conductivity, including its quasi-linear increase with decreasing T down to ~0.4K and its downturn at lower temperatures, is in agreement with the theory. The values of the Fermi- liquid parameter obtained from the comparison agree with the corresponding values extracted from the analysis of Shubnikov-de Haas oscillations based on the theory of magnetooscillations in interacting 2D systems.

26 pages, 5 color figures

References in corpus (8)

• Metal-Insulator Transition in Disordered Two-Dimensional Electron Systems
• Flow diagram of the metal-insulator transition in two dimensions
• Interaction effects on magnetooscillations in a two-dimensional electron gas
• Metal-Insulator Transition in 2D: Experimental Test of the Two-Parameter Scaling
• Intervalley scattering and weak localization in Si-based two-dimensional structures
• Disappearance of the metal-like behavior in GaAs two-dimensional holes below 30 mK
• Critical behavior of transport and magnetotransport in 2D electron system in Si in the vicinity of the metal-insulator transition
• Spin-valley interplay in two-dimensional disordered electron liquid

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