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- W2963996852 abstract "an insulating behavior below a critical density of nc = 5 × 10 10 cm 2 with the resistivity decreasing with increasing temperature. We analyze this transition using a percolation model arising from the failure of screening in random background charged impurities. We also examine the percolation transition experimentally by introducing remote ionized impurities at the surface. Using a bias during cool-down, we modify the screening charge at the surface which strongly affects the critical density. Our study shows that transition from a metallic to an insulating phase in our system is due to percolation transition. The metallic behavior of the resistivity observed at low temperatures in low-disorder two-dimensional (2D) systems is a topic of great interest in condensed matter physics. The scaling theory of localization predicts a noninteracting two-dimensional system in the presence of finite disorder is an insulator at zero temperature in the thermodynamic limit [1]. Indeed early experiments confirmed that in highly-disordered two dimensional electron systems (2DESs) the resistivity shows an insulating logarithmic temperature dependence [2]. The scaling theory was challenged by the observation of an apparent metalinsulator transition in high-mobility electron inversion layers in Si metal-oxide-semiconductor-field-effect transistors (MOSFETs) and later in several other 2D semiconductor systems [3, 4]. At higher densities, a metallic temperature dependence of the resistivity, ρ, and a concomitant transition to an insulating phase at lower densities were observed. This apparent metal insulator transition (MIT) is marked by a ”critical carrier density”," @default.
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- W2963996852 date "2015-03-04" @default.
- W2963996852 modified "2023-09-23" @default.
- W2963996852 title "An apparent metal insulator transition in high mobility 2D InAs heterostructures" @default.
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