title: Palladium nanoparticle enhanced giant photoresponse at LaAlO3/SrTiO3 two-dimensional electron gas heterostructures.
abstract: With LaAlO3 surface modification by Pd nanoparticles, LaAlO3/SrTiO3 (LAO/STO) interfacial two-dimensional electron gas presents a giant optical switching effect with a photoconductivity on/off ratio as high as 750% under UV light irradiation. Pd nanoparticles with a size around 2 nm are deposited on top of the LAO surface, and the LAO/STO interface exhibits a giant response to UV light with a wavelength shorter than 400 nm. This giant optical switching behavior has been explained by the Pd nanoparticle's catalytic effect and surface/interface charge coupling.
authors.affiliation: Department of Applied Physics, The Hong Kong Polytechnic University , Hung Hom, Kowloon, Hong Kong, People's Republic of China.
authors.forename: Ngai Yui
authors.initials: NY
authors.lastname: Chan
authors.forename: Meng
authors.initials: M
authors.lastname: Zhao
authors.forename: Ning
authors.initials: N
authors.lastname: Wang
authors.forename: Kit
authors.initials: K
authors.lastname: Au
authors.forename: Juan
authors.initials: J
authors.lastname: Wang
authors.forename: Lai Wa Helen
authors.initials: LW
authors.lastname: Chan
authors.forename: Jiyan
authors.initials: J
authors.lastname: Dai