1. Department of Electrical and Computer Engineering; National University of Singapore; 117583 Republic of Singapore
2. NUS Graduate School for Integrative Sciences and Engineering; National University of Singapore; Kent Ridge 117456 Republic of Singapore
3. Department of Physics and Centre for Computational Science and Engineering; National University of Singapore; Singapore 117546 Republic of Singapore
4. Center for Phononics and Thermal Energy Science; School of Physics Science and Engineering; Tongji University; 200092 Shanghai China