%0 Journal Article
%A C.-L Wu
%A P.-W Lee
%A Y.-C Chen
%A L.-Y Chang
%A C.-H Chen
%A C.-W Liang
%A P Yu
%A Q He
%A Ramamoorthy Ramesh
%A Y.-H Chu
%B Physical Review B - Condensed Matter and Materials Physics
%D 2011
%G eng
%R 10.1103/PhysRevB.83.020103
%T Direct spectroscopic evidence of charge reversal at the Pb(Zr 0.2Ti0.8)O3/La0.7Sr 0.3MnO3 heterointerface
%V 83
%X At the heterointerface of a top ferroelectric Pb(Zr0.2Ti 0.8)O3 (PZT) ultrathin film and a bottom La 0.7Sr0.3MnO3 (LSMO) electrode, we used continuous synchrotron-radiation photoelectron spectroscopy to probe in situ and demonstrated that the interfacial charges are reversible and their affected valence-band barrier height becomes modulated upon switching the polarization in the top layer. By monitoring the core-level shifting of the buried LSMO layer under continuous illumination of synchrotron radiation, we directly observed a temporal screening of polarization induced by the photon-generated carriers in the top PZT layer. This dynamic characterization of the core-level shifting of the buried layer demonstrates an effective method to probe the electric conduction and ferroelectric polarization of an ultrathin ferroelectric oxide thin film. © 2011 American Physical Society.