1. State Key Laboratory of Terahertz and Millimeter Waves and Department of Materials Science & EngineeringCity University of Hong Kong Hong Kong SAR 999077 P. R. China
2. Department of ChemistrySouth University of Science and Technology of China Shenzhen 518055 P. R. China
3. Institute for Advanced StudyShenzhen University Shenzhen 518060 P. R. China
4. Department of ChemistryCity University of Hong Kong Hong Kong SAR 999077 P. R. China
5. Department of MathematicsCity University of Hong Kong Hong Kong SAR 999077 P. R. China
6. Department of Mechanical EngineeringCity University of Hong Kong Hong Kong SAR 999077 P. R. China