1. Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
2. Geballe Laboratory for Advanced Materials, Stanford University, Palo Alto, California 94305, United States
3. J.A. Woollam Co., Inc., Lincoln, Nebraska 68508, United States
4. Department of Physics, The University of Texas at Austin, Austin, Texas 78712, United States
5. School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14850, United States
6. Institute for Energy Efficiency, University of California Santa Barbara, Santa Barbara, California 93106, United States
7. Department of Electrical and Computer Engineering, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States