1. State University of New York at Stony Brook, Stony Brook, New York 11794-2350, United States
2. National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
3. Department
of Physics, Florida State University, Tallahassee, Florida 32306, United States
4. School
of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
5. Racah Institute of Physics, Hebrew University, Jerusalem 91904, Israel
6. U.S. Army Research Laboratory, 2800 Powder Mill Road, Adelphi, Maryland 20783, United States