作者机构:[1]Laboratory of Computational Physics, Institute of Applied Physics andComputational Mathematics, Beijing, China., [2]Division of Mathematical Sciences, School of Physical and MathematicalSciences, Nanyang Technological University, Singapore, 637371., [3]Department of Mathematics, Pennsylvania State University, University Park,PA 16802, USA.
相关基金:Acknowledgments The work of Zhu is supported in part by the National Natural Science Foundation of China (No. 10571017). The work of Yuan is supported in part by the National Natural Science Foundation of China (No. 60533020). The work of Du is supported in part by NSF DMS 0712744. The authors would like to thank Dr. Zhiqiang Sheng for interesting discussions on the subject. They also would like to thank the LSEC of CAS for the use of the LSSC-Ⅱ cluster.