1. Adámas Nanotechnologies, 8100 Brownleigh Dr., Raleigh, North Carolina 27617
2. Department of Physics, Ben-Gurion University of the Negev, Be’er-Sheva 8410501, Israel
3. General Physics Institute, RAS, Vavilov Street 38, 119991 Moscow, Russia
4. College of Staten Island, CUNY, 2800 Victory Blvd., Staten Island, New York 10312