Direct observation of ferroelectric polarization-modulated band bending at oxide interfaces

B. C. Huang, Y. T. Chen, Y. P. Chiu*, Y. C. Huang, J. C. Yang, Y. C. Chen, Ying-hao Chu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

This study presents a direct visualization of the influences of ferroelectric polarization on the electronic properties of the Schottky contact at the Nb-SrTiO 3/BiFeO 3 hetero-interface using scanning tunneling microscopy and spectroscopy (STM/S). The evolution of the local density of states across the Nb-SrTiO 3/BiFeO 3 interface reveals the interfacial band alignment and the characteristic quantities of the metal/ferroelectric contact. The unique combination of STM and STS in this study delivers an approach to obtain critical information on the interfacial electronic configurations of ferroelectric oxide interfaces and also their variation with ferroelectric polarization switching.

Original languageEnglish
Article number122903
Number of pages4
JournalApplied Physics Letters
Volume100
Issue number12
DOIs
StatePublished - 19 Mar 2012

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