Funding for this research was provided by:
Directorate for Mathematical and Physical Sciences (NSF-DMS-1818924)
Air Force Office of Scientific Research (FA9550-18-1-0257)
ITN-ETN (642768)
Fujian Provincial Department of Science and Technology (2016J05022)
National Natural Science Foundation of China (11601455)
NSAF (U1630247)
H2020 Marie Skłodowska-Curie Actions (H2020-MSCA-IF-2014)
Article History
Received: 25 July 2018
Revised: 13 October 2018
Accepted: 10 December 2018
First Online: 19 December 2018