Affiliation: | a Department of Physics, Harran University, Osmanbey Yerle?kesi, ?anl?urfa 63300, Turkeyb Department of Physics, Koç University, Rumelifeneri yolu, Sar?yer, Istanbul 34450, Turkeyc Institute of Quantum Electronics, ETH Zurich Wolfgang-Pauli-Strasse 16, CH-8093 Zurich, Switzerland |