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arXiv 1104.2675cond-mat.quant-gasquant-ph
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一维相互作用玻色气体中的Loschirm回波

Loschmidt echo in one-dimensional interacting Bose gases

K. Lelas, T. Ševa, H. Buljan

摘要:

我们探讨了一维相互作用玻色气体中的两种区域的Loschlavian回波:强相互作用Tonks-Girardeau(TG)区域和弱相互作用平均场区域。我们发现,当小扰动被添加到哈密顿量(指数是成比例的粒子数和一个小扰动的平方的大小)的TG气体的Loschirton回波衰减为高斯。在平均场制度中的Loschirp回波衰减更快的较大的粒子间相互作用(非线性),它表现出更丰富的行为比TG Loschirp回波动力学,振荡叠加在整体衰减。

英文摘要:

We explore Loschmidt echo in two regimes of one-dimensional (1D) interacting Bose gases: the strongly interacting Tonks-Girardeau (TG) regime, and the weakly-interacting mean-field regime. We find that the Loschmidt echo of a TG gas decays as a Gaussian when small perturbations are added to the Hamiltonian (the exponent is proportional to the number of particles and the magnitude of a small perturbation squared). In the mean-field regime the Loschmidt echo decays faster for larger interparticle interactions (nonlinearity), and it shows richer behavior than the TG Loschmidt echo dynamics, with oscillations superimposed on the overall decay.

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