1. Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Dr, La Jolla, California 92093, USA
2. Department of Materials Science and Engineering, The University of Texas at Dallas, 800 W Campbell Rd, Richardson, Texas 75080, USA
3. Department of Physics Education, Chonnam National University, 77 Yongbong-ro, Yongbong-dong, Buk-gu, Gwangju 61186, South Korea