1. Microelectronics Research Center and Department of Electrical
and Computer Engineering, The University of Texas at Austin, Austin, Texas 78758, United States
2. Research Center for the Mechanics of Solids,
Structures and Materials and Department of Aerospace Engineering and
Engineering Mechanics, The University of Texas at Austin, Austin, Texas 78712, United States
3. Department of Electrical Engineering, Yale University, New Haven, Connecticut 06520, United States
4. Department of Electrical and Computer Engineering, The University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States