Institution: | 1.Institute of Solid State Physics,Russian Academy of Sciences,Chernogolovka, Moscow region,Russia;2.Laboratorium für Festk?rperphysik,Universit?t Duisburg-Essen,Duisburg,Germany;3.Laboratorio TASC, CNR-IOM,Trieste,Italy;4.NEST,Istituto Nanoscienze and Scuola Normale Superiore,Pisa,Italy;5.Laboratory for Solid State Physics,ETH Zürich,Zürich,Switzerland |