1. Institute for Solid State Physics and Optics HUN‐REN Wigner Research Centre for Physics P.O. Box 49 Budapest H‐1525 Hungary
2. Eötvös Loránd University P.O. Box 32 Budapest H‐1518 Hungary
3. Materials Sciences Graduate Program and Advanced Materials and Liquid Crystal Institute Kent State University Kent Ohio 44242 USA
4. Department of Physics Kent State University Kent Ohio 44242 USA