1. Institute of Polymer
Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
2. Department of Materials
Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan
3. Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
4. Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan
5. Department of Physics, National Taiwan University, Taipei 10617, Taiwan