Physics – Condensed Matter – Materials Science
Scientific paper
2010-08-11
Physics
Condensed Matter
Materials Science
Scientific paper
The study of new physical phenomena in the solid state requires the use of clean, stoichiometric materials. For example, the manifestation of the wave nature of two-dimensional electrons in semiconductor heterostructures and its progressive visibility in systems with higher mobility went hand-in-hand with the efforts to remove the effect of impurity scattering. The most important step was achieved by modulation doping, in which the carrier mobility is significantly increased by spatially separating the two-dimensional electron gas from the ionized impurity scattering sites. Here we show high-mobility two-dimensional electron gases (2DEGs) in complex oxides, free from impurity scattering. Interface doping with a remote defect scavenging layer containing copper dioxide in a SrTiO3-SrCuO2-LaAlO3-SrTiO3(001) heterostructure, 2DEG with enhanced electron mobility is achieved, which is similar to a modulation doping scheme successfully used in classic semiconductors. Having made this technologically important step, oxide high mobility 2DEG electronics becomes feasible.
Blank Dave H. A.
Brinkman Albert
Guduru V. K.
Hilgenkamp Hans
Huijben Mark
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