Kentaro Kutsukake1,2, Noritaka Usami1, Yutaka Ohno1, Yuki Tokumoto1, Ichiro Yonenaga1
1Institute for Materials Research (IMR), Tohoku University, Sendai, 980-8577, Japan
2Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST), Kawaguchi, Saitama, 332-0012, Japan