1. Department of Chemistry and Biochemistry, University of California at San Diego, La Jolla, California 92093, United States
2. Department of Physics, University of Central Florida, Orlando, Florida 32816, United States
3. Department of Physics, University of Florida, Gainesville, Florida 32611, United States
4. Quantum Design, San Diego, California 92121, United States
5. Division of Applied Chemistry, Osaka University, Suita, Osaka 565-0871, Japan
6. National High Magnetic Field Laboratory and Department of Physics, Florida State University, Tallahassee, Florida 32310, United States