Journal
NANOSCALE HORIZONS
Volume 4, Issue 5, Pages 1194-1201Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nh00188c
Keywords
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Funding
- Vannevar Bush Faculty Fellowship ONR [N00014-15-1-2847]
- National Science Foundation [DMR-1629270]
- Air Force Office of Scientific Research [FA9550-15-1-0334]
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SrTiO3-based heterointerfaces exhibit gate-tunable superconductivity, magnetism, and several other properties that can be programmed at nanoscale dimensions using conductive atomic force microscopy (c-AFM). Spatially resolved measurements indicate that intrinsic structural distortions in the SrTiO3 layer can profoundly influence the transport characteristics. Here, we report the low temperature transport properties of quasi-1D, cross-shaped electron waveguides, nanocrosses, created at the LaAlO3/SrTiO3 interface using c-AFM lithography. Inhomogeneities in the electronic band structure of the four arms are observed that are highly reproducible over several device writing/measurement cycles, provided that the writing is performed at the same location on the sample. A proposed ferroelastic domain configuration near the nanocross can provide a mechanism for the observed inhomogeneities. Our model suggests that the three-dimensional ferroelastic domain structure of SrTiO3 near the LaAlO3/SrTiO3 interface can significantly and reproducibly affect the transport properties of the interface. The nanocross geometry can also serve as a building block for understanding the 1D electron physics of LaAlO3/SrTiO3 heterostructures.
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