One dimensional electron gas at the LaAlO3/SrTiO3 interface and its transport properties

• Published in: Applied physics letters Vol. 109; no. 17
• Main Authors: Hong, D. S., Zhang, H., Zhang, H. R., Zhang, J., Wang, S. F., Chen, Y. S., Shen, B. G., Sun, J. R.
• Format: Journal Article
• Language: English
• Published: Melville American Institute of Physics 24-10-2016
• Subjects: Applied physics; Electron gas; Electron transport; Illumination; Light; Nanowires; Strontium titanates; Substrates; Titanium dioxide
• ISSN: 0003-6951; 1077-3118
• DOI: 10.1063/1.4966546

Quasi-one-dimensional electron gases (q1DEGs) have been obtained by fabricating LaAlO3 nanowires, using the technique of electrostatic spinning plus post annealing, above TiO2-terminated SrTiO3 substrate. The q1DEG exhibits an electronic transport behavior of variable range hopping with the one dimension characteristic. Visible light illumination produces a strong effect on transport process, depressing the resistance of the q1DEG by a factor up to 8. As expected, gating effect is weak at relative high temperatures, ∼3.2% at 150 K and 1.5% at 300 K under a back gate of 200 V. Aided by light illumination, however, the gating effect is 35-fold amplified, and the resistance increases under not only negative gates but also positive gates, different from the normal gating effect without illumination. Possible explanations for these phenomena are given.