"Y. Okimoto,S. Naruse,R. Fukaya,T. Ishikawa,S. Koshihara,K. Oka,M. Azuma,K. Tanaka,H. Hirori","Ultrafast Control of the Polarity of BiCoO3 by Orbital Excitation as Investigated by Femtosecond Spectroscopy",,"PHYSICAL REVIEW APPLIED",,"Vol. 7","Num. 6","  064016",2017,June