1. College of Science, George Mason University, Fairfax, Virginia 22030,
United States
2. Institut
d’Electronique
Fondamentale, Université Paris-Sud, 91405 Orsay Cedex, France
3. Departments of Chemistry and
Cell Biology, The Scripps Research Institute La Jolla, California 92037, United States
4. Sotera Defense Solutions, Crofton,
Maryland 21114, United States