1. Center
for Advanced Solar Photophysics, National Renewable Energy Laboratory, Golden, Colorado 80401, United States
2. School
of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
3. Center
for Advanced Solar Photophysics, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
4. Department
of Physics, University of California, Santa Cruz, California 95064, United States