Mildred S. Dresselhaus^*,† and John G. Mavroides^*,†

• Lincoln Laboratory, Massachusetts Institute of Technology, Lexington, Massachusetts

• ^*Visiting scientists, National Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts; National Magnet Laboratory is supported by the U. S. Air Force Office of Scientific Research.
• ^†Operated with support from the U. S. Air Force.