Author Affiliations

Y. Ino,^1,** R. Shimano,^1,* M. Kuwata-Gonokami,¹ Erik M. Vartiainen,² Yuri P. Svirko,³ and K.-E. Peiponen³

¹Department of Applied Physics, the University of Tokyo, and SORST, Japan Sceience and Technology Corporation(JST), 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan

²Department of Electrical Engineering, Lappeenranta University of Technology, P.O.Box 20, Fin-53851 Lappeenranta, Finland

³Department of Physics, University of Joensuu, P.O.Box 111, Fin-80101 Joensuu, Finland

^*The present address is “Department of Physics, the University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan”

^** yusuke@ap4.t.u-tokyo.ac.jp