1. Department
of Physics, The University of Texas at Dallas, Richardson, Texas 75080, United States
2. National
High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
3. Advanced
Imaging Research Center, The University of Texas Southwestern Medical Center, Dallas, Texas 75390, United States
4. Department
of Chemistry, The University of Texas at Dallas, Richardson, Texas 75080, United States