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arXiv · 1401.5633

Laterally-confined two-dimensional electron gases in self-patterned LaAlO3/SrTiO3 interfaces

M. Foerster·R. Bachelet·V. Laukhin·J. Fontcuberta·G. Herranz·F. Sanchez
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Abstract

A bottom-up process has been used to engineer the LaAlO3/SrTiO3 interface atomic composition and locally confine the two-dimensional electron gas to lateral sizes in the order of 100 nm. This is achieved by using SrTiO3(001) substrate surfaces with self-patterned chemical termination, which is replicated by the LaAlO3 layer, resulting in a modulated LaO/TiO2 and AlO2/SrO interface composition. We demonstrate the confinement of the conducting interface forming either long-range ordered nanometric stripes or isolated regions. Our results demonstrate that engineering the interface chemical termination is a suitable strategy towards nanoscale lateral confinement of two-dimensional high-mobility systems.

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M. Foerster, R. Bachelet, V. Laukhin, J. Fontcuberta, G. Herranz, F. Sanchez. 2014-01-22. Laterally-confined two-dimensional electron gases in self-patterned LaAlO3/SrTiO3 interfaces. https://doi.org/10.1063/1.4728109

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