作者机构:[1]Tsinghua National Laboratory for Information Science and Technology, Institute of Mieroelectronics, Tsinghua University, Beijing 100084, China
相关基金:Acknowledgement The authors are grateful to Deng Zhi, Yinong and Zhang Zhi from Zhu Weibin, Liu Department of Engineering Physics Tsinghua University for their helpful suggestions. The work is supported by the National Natural Science Foundation of China (No.61006021).