SGC Switching Between Subluminal to Superluminal Propagation in Ⅴ-Type Atom

作     者：HAN Ding-An, GUO Hong,~1 BAI Yan-Feng,~1 SUN Hui,~1 and ZENG Ya-Guang~2 1 CREAM Group, Key Laboratory for Quantum Information and Measurements of Ministry of Education, School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China 2 physics Department, Foshan University, Foshan 528000, China 

作者机构：CREAM Group，Key Laboratory for Quantum Information and Measurements of Ministry of Education，School of Electronics Engineering and Computer Science，Peking University，Beijing 100871，China Physics Department，Foshan University，Foshan 528000，China CREAM Group，Key Laboratory for Quantum Information and Measurements of Ministry of Education，School of Electronics Engineering and Computer Science，Peking University，Beijing 100871，China Physics Department，Foshan University，Foshan 528000，China 

出 版 物：《Communications in Theoretical Physics》 (理论物理(英文版))

年 卷 期：2006年第10期

页      面：731-734页

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：The project supported by National Natural Science Foundation of China under Grant No. 10547108 

主　　题：spontaneously generated coherence superluminal subluminal 

摘      要：For a V-type three-level atomic system with two closely spaced upper levels, we investigate the light pulse propagation properties with only one laser field. Due to spontaneously generated coherence, the group velocity of the light pulse can be changed from subluminal to superluminal. The effects of the field intensity and the two-upper level splitting on the group velocity are also shown. At last, an analytical expression for the group velocity is given in the case of a weak field.