1. Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea, Materials Research Laboratory and Department of Materials, Physics, Molecular, Cellular, and Developmental Biology, University of CaliforniaSanta Barbara, Santa Barbara, California 93106, Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19010, College of Optoelectronic Engineering, Chongqing University, Chongqing, China, and Temperature-Humidity Group, Korea...