1. Department
of Physics, CUNY-City College of New York, New York, New York 10031, United States
2. Center for Physical Sciences and Technology, Vilnius LT-01108, Lithuania
3. 3rd
Physics Institute, University of Stuttgart, 70569 Stuttgart, Germany
4. Max Planck Institute for Solid State Research, 70174 Stuttgart, Germany
5. Laser Physics
Centre, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 0200, Australia
6. CUNY-Graduate Center, New York, New York 10016, United States