Affiliation: | a Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong S.A.R., PR China b Yerevan Physics Institute, 2 Alikhanian Brothers Str., 375036 Yerevan, Armenia c Lebedev Physical Institute, Leninskii Prospect 53, 119991 Moscow, Russia d Institute of Physics, University of Tartu, Riia 142, 51014 Tartu, Estonia |