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arXiv 0904.0915quant-phcond-mat.quant-gas
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光晶格中超冷原子的光散射

Light scattering by ultracold atoms in an optical lattice

Stefan Rist, Chiara Menotti, Giovanna Morigi

摘要:

从理论上研究了光晶格中光子与超冷原子的线性光散射。一个完整的量子理论的原子-光子相互作用的Mott绝缘体-超流体相变的晶格中的原子状态的函数,和光子散射截面的能量和发射方向的函数进行评估。将该理论的预测与最近关于飞行时间测量中布拉格散射的工作的理论结果[A.M. Rey,{ \it et al.},A { \bf 72},023407(2005)]。我们表明,当执行布拉格光谱与光散射,光子反冲引起一个额外的原子网站跳跃,这可以干扰普通的物质波隧穿,并可以显着影响光子散射截面。

英文摘要:

We investigate theoretically light scattering of photons by ultracold atoms in an optical lattice in the linear regime. A full quantum theory for the atom-photon interactions is developed as a function of the atomic state in the lattice along the Mott-insulator -- superfluid phase transition, and the photonic scattering cross section is evaluated as a function of the energy and of the direction of emission. The predictions of this theory are compared with the theoretical results of a recent work on Bragg scattering in time-of-flight measurements [A.M. Rey, {\it et al.}, Phys. Rev. A {\bf 72}, 023407 (2005)]. We show that, when performing Bragg spectroscopy with light scattering, the photon recoil gives rise to an additional atomic site to site hopping, which can interfere with ordinary tunneling of matter waves and can significantly affect the photonic scattering cross section.

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