Kyoungjun Lee

Annealing SrTiO3 produces an iron-rich surface layer

SrTiO3 (STO) is among the most widely used substrates in complex oxide heterostructure research, yet the role of its trace impurity content in determining interface properties remains poorly understood. Here, we show that high-temperature annealing (the standard procedure for pre...

Local probing of superconductivity at oxide interfaces with atomic force microscopy

Abstract Superconductivity in strontium titanate has remained enigmatic for over 50 years. The LaAlO 3 /SrTiO 3 (LAO/STO) heterointerface enables systematic dimensional confinement, from two-dimensional electron gas to quasi-one-dimensional nanostructures, providing unprecedented...