1. Department of Physics, University of Washington, Seattle, Washington 98195, United States
2. Center for Theoretical Biological Physics, Rice University, Houston, Texas 77005, United States
3. Department of Chemistry and Biochemistry, National Chung Cheng University, Minhsiung, Chiayi 621301, Taiwan
4. Pacific Northwest National Laboratory, Seattle, Washington 98109, United States
5. Division of Physics, National Center for Theoretical Sciences, National Taiwan University, Taipei 106319, Taiwan