光晶格中的非谐参量激发
Anharmonic parametric excitation in optical lattices
摘要：
本文从理论和实验两方面研究了远场非共振光晶格中参量激发引起的损耗。限制在一维正弦晶格中的原子呈现出与谐波势所预期的激发谱和动力学基本不同的激发谱和动力学。我们开发了一个模型的基础上，在晶格中的实际原子哈密顿量，我们半经验地介绍了一个加宽的宽度的晶格能带，可以物理上产生的晶格的不均匀性和波动，也从原子碰撞。我们的模型满意地描述了参量共振的位置和强度以及囚禁原子数的演化。
英文摘要：
We study both experimentally and theoretically the losses induced by parametric excitation in far-off-resonance optical lattices. The atoms confined in a 1D sinusoidal lattice present an excitation spectrum and dynamics substantially different from those expected for a harmonic potential. We develop a model based on the actual atomic Hamiltonian in the lattice and we introduce semiempirically a broadening of the width of lattice energy bands which can physically arise from inhomogeneities and fluctuations of the lattice, and also from atomic collisions. The position and strength of the parametric resonances and the evolution of the number of trapped atoms are satisfactorily described by our model.
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