Growth-induced electron mobility enhancement at the LaAlO${}_3$/SrTiO${}_3$ interface

Abstract

We have studied the electronic properties of the 2D electron liquid present at the LaAlO${}_3$/SrTiO${}_3$ interface in series of samples prepared at different growth temperatures. We observe that interfaces fabricated at 650°C exhibit the highest low temperature mobility ($\approx 10000{\text{ cm}}^2/\text{Vs}$) and the lowest sheet carrier density ($\approx 5\times 10^{12}{\text{ cm}}^{-2}$). These samples show metallic behavior and Shubnikov-de Haas oscillations in their magnetoresistance. Samples grown at higher temperatures (800-900°C) display carrier densities in the range of $\approx 2-5\times 10^{13}{\text{ cm}}^{-2}$ and mobilities of $\approx 1000{\text{ cm}}^2/\text{Vs}$ at 4K. Reducing their carrier density by field effect to $8\times 10^{12}{\text{ cm}}^{-2}$ lowers their mobilites to $\approx 50{\text{ cm}}^2/\text{Vs}$ bringing the conductance to the weak-localization regime.

References in corpus (19)

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• Optically excited multi-band conduction in LaAlO3/SrTiO3 heterostructures
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Cited by in corpus (14)

• Physics of SrTiO${}_3$-based heterostructures and nanostructures: a review
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• Dual-Gate Modulation of Carrier Density and Disorder in an Oxide Two-Dimensional Electron System
• Oxide 2D electron gases as a route for high carrier densities on (001) Si
• Universality of Electron Mobility in LaAlO${}_3$/SrTiO${}_3$ and bulk SrTiO${}_3$
• Probing Quantum Confinement and Electronic Structure at Polar Oxide Interfaces
• Nature of electrons from oxygen vacancies and polar catastrophe at LaAlO3/SrTiO3 interfaces
• Enhancement of electron mobility at oxide interfaces induced by WO3 overlayers
• Electron Pairing and Nematicity in LaAlO${}_3$/SrTiO${}_3$ Nanostructures
• Conducting LaAlO3/SrTiO3 heterointerfaces on atomically flat substrates prepared by deionized-water
• Hard x-ray angle-resolved photoemission from a buried high-mobility electron system
• Growth-Temperature Dependence of Conductivity at the LaCrO${}_3$/SrTiO${}_3$ (001) Interface
• A Laser-ARPES View of the 2D Electron Systems at LaAlO3/SrTiO3 and Al/SrTiO3 Interfaces
• Local inhomogeneities resolved by scanning probe techniques and their impact on local 2DEG formation in oxide heterostructures