1. Department of Electrical and Computer Engineering, The University of Illinois at Chicago, Chicago, Illinois 60607
2. Department of Electrical and Computer Engineering, The University of Illinois at Urbana-Champaign, Champaign, Illinois 60607
3. NXP Semiconductor, Chandler, Illinois 60607
4. IQE, Somerset, Illinois 60607
5. Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60607