Funding for this research was provided by:
U.S. Department of Energy (DE-SC0018410)
Air Force Office of Scientific Research (FA9550-16- 1-0444)
National Science Foundation (1563427)
U.S. Department of Energy (DE-SC0012774:0001)
Deutsche Forschungsgemeinschaft (La1974/4-1)
Received: 15 November 2018
Accepted: 18 February 2019
First Online: 15 March 2019
: The authors declare that they have no competing interests.
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