Supported by the National Natural Science Foundation of China under Grant Nos.60872137, 30873462, 90209008, 30870685, 30672690, 30600151, 60532050, 60621001 (国家自然科学基金); the National Basic Research Program of China under Grant No.2006CB705700 (国家重点基础研究发展计划(973)); the Program for Cheung Kong Scholars and Innovative Research Team in University of China under Grant No.IRT0645 (长江学者和创新团队发展计划); the Program for Chair Professors of “Cheung Kong Scholars Program” of China (“长江学者奖励计划”特聘教授); the Joint Research Fund for Overseas Chinese Young Scholars under Grant No.30528027 (海外青年学者合作研究基金); the CAS Hundred Talents Program (中国科学院百人计划); the CAS Scientific Research Equipment Develop Program under Grant Nos.YZ0642, YZ200766 (中国科学院重大科研装备研制项目); the Beijing Municipal Natural Science Foundation of China under Grant No.4071003 (北京市自然科学基金)