Institution: | a Department of Physics, CREST, Tohoku University, Aramaki Aza-Aoba, Aoba-ku, Sendai 980-8578, Japan b Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA c Department of Physics, Brookhaven National Laboratory, Upton, NY 11973, USA d Institute for Chemical Research, Kyoto University, Uji, 611-0011, Japan |