Highly confined electronic conduction– A peek into the field of oxide heterostructures

The conductance confined at the interface of complex oxide heterostructures provides new opportunities to explore nanoelectronic as well as nanoionic devices. In this talk I will present our recent results on electronic conductivity at different heterostructures systems. I will discuss and show what is happening when two oxides intimately contact each other, charge redistribution or mass transfer of ions may occur. Our recent results of high mobile samples realized by, interface confined redox reactions [1], strain induced polarization [2] and modulation doping [3] at complex oxide interfaces. Based on the enhanced mobility we have recently studied the Quantum Hall Effect (QHE) which reveal the strength of enhancing the mobility [4]. This collection of samples offers unique opportunities for a wide range of rich world of mesoscopic physics.

[1]  Y. Z. Chen & N. Pryds et al. “A high-mobility two-dimensional electron gas at the spinel/perovskite interface of γ-Al2O3/SrTiO3”. Nature Commun. 4, 1371 (2013)

 [2] Y. Z. Chen & N. Pryds et al. “Creation of High Mobility Two-Dimensional Electron Gases via Strain Induced Polarization at an Otherwise Nonpolar Complex Oxide Interface” Nano Letters. 3774-3778 (2015) 10.1021/nl504622w

 [3] Y. Z. Chen & N. Pryds et al. “Extreme mobility enhancement of oxide 2DEGs via charge transfer induced modulation doping.” Nature Materials, 14 (8), 801-806 (2015)

 [4] F. Trier &N. Pryds et al., “Quantization of Hall Resistance at the Metallic Interface between an Oxide Insulator and SrTiO3” Physical Review Letters, 117, 096804 (2016)