Atomic-Scale Evolution of Local Electronic Structure Across Multiferroic Domain Walls (pages 1530–1534)
Ya-Ping Chiu, Yu-Ting Chen, Bo-Chao Huang, Min-Chuan Shih, Jan-Chi Yang, Qing He, Chen-Wei Liang, Jan Seidel, Yi-Chun Chen, Ramamoorthy Ramesh and Ying-Hao Chu
Article first published online: 22 FEB 2011 | DOI: 10.1002/adma.201004143
Direct evidence of the electronic configurations across domain walls in BiFeO3 is quantitatively characterized by cross-sectional scanning tunneling microscopy. Atomic-scale band evolution and the asymmetrically built-in potential barrier at domain boundaries are demonstrated. The 109° domain walls register a remarkable decrease in the bandgap, suggesting a new route to control the local conducting channels within 2 nm.