1. Department
of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7202, United States
2. Army Research Laboratory, RDRL-SED-C, 2800 Powder Mill Road, Adelphi, Maryland 20783, United States
3. Theoretical Department, Joint Institute for High Temperatures, Russian Academy of Sciences, Izhorskaya 13/19, 117419 Moscow, Russia
4. Institut für Theoretische Physik, Heinrich-Heine-Universität Düsseldorf, D-40225 Düsseldorf, Germany
5. Department of Physical and Life Sciences, Fisk University, Nashville, Tennessee 37208, United States