Mahidol University, Department of Physics, Faculty of Science, Rama 6 Road, Bangkok, 10400 Thailand; University of Delaware, Bartol Research Institute and Department of Physics and Astronomy, Newark, DE 19716, USA
Mahidol University, Department of Physics, Faculty of Science, Rama 6 Road, Bangkok, 10400 Thailand
University of Delaware, Bartol Research Institute and Department of Physics and Astronomy, Newark, DE 19716, USA
University of Delaware, Bartol Research Institute and Department of Physics and Astronomy, Newark, DE 19716, USA