Tunable bilayer two-dimensional electron gas in LaAlO3/SrTiO3 superlattices

摘要

We report magnetotransport properties of double heterointerfaces in LaAlO3/SrTiO3/LaAlO3/SrTiO3(001) (LAO/STO/LAO/STO). A strong nonlinearity in the Hall resistivity is found when the temperature is below 80 K. This effect is attributed to multichannel conduction of interfacial charges generated in double heterostructures of LAO/STO where two-dimensional electron gas (2DEG) is produced. The multichannel conduction is confirmed by back gating modulation of Hall effect. Our result suggests the possibility to achieve coupled bilayer 2DEG layers in LAO/STO superlattices.