In a four-level atomic system, we investigate the light pulse propagation properties interacting with only one laser field. It is shown that in the steady state, the group velocity of the light pulse can be changed fr...In a four-level atomic system, we investigate the light pulse propagation properties interacting with only one laser field. It is shown that in the steady state, the group velocity of the light pulse can be changed from subluminal to superluminal by varying the field detuning. Meanwhile, the effects of the field intensity on the group velocity are also shown. At last, with special parameters, the analytical solution for the group index is also obtained.展开更多
Interference of an atomic Bose-Einstein condensate interacting with a laser field in a double-well potential with dissipation is investigated.If properly selecting the laser field and the initial states of the atoms i...Interference of an atomic Bose-Einstein condensate interacting with a laser field in a double-well potential with dissipation is investigated.If properly selecting the laser field and the initial states of the atoms in the two wells, we lind that the intensity exhibits revivals and collapses.The fidelity of interference is affected by the total number of atoms in the two wells and dissipation.展开更多
基金National Natural Science Foundation of China under Grant No.10547108the Natural Science Foundation of Foshan University
文摘In a four-level atomic system, we investigate the light pulse propagation properties interacting with only one laser field. It is shown that in the steady state, the group velocity of the light pulse can be changed from subluminal to superluminal by varying the field detuning. Meanwhile, the effects of the field intensity on the group velocity are also shown. At last, with special parameters, the analytical solution for the group index is also obtained.
文摘Interference of an atomic Bose-Einstein condensate interacting with a laser field in a double-well potential with dissipation is investigated.If properly selecting the laser field and the initial states of the atoms in the two wells, we lind that the intensity exhibits revivals and collapses.The fidelity of interference is affected by the total number of atoms in the two wells and dissipation.
