作者机构:[1]Department of Physics, University of Science and Technology of China, Hefei 230026, China, [2]The Center of Physical Experiments, University of Science and Technology of China, Hefei 230026, China
相关基金:Project supported by the National Natural Science Foundation of China (Grant Nos. 11074232, 10874160, and 21002097) and the National Basic Research Program of China (Grant Nos. 2011CB932801 and 2012CB933702).