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arXiv 0908.2485cond-mat.quant-gas
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光晶格中一维玻色子的含时流

Time-dependent currents of 1D bosons in an optical lattice

Johannes Schachenmayer, Guido Pupillo, Andrew J. Daley

摘要:

本文分析了一维玻色气体在光晶格中的电流随时间的变化。对于一维系统,通过加速晶格引起的电流的稳定性表现出作为加速度的大小的函数的宽交叉,和粒子间相互作用的强度。这与平均场在更高维度下的结果有显著不同。使用无限时间演化块抽取算法,我们通过对电流的随时间变化的行为及其衰减率进行定量预测来消除这种交叉。我们还计算了可以在实验中直接测量的准凝聚分数的时间依赖性。我们比较我们的结果计算的基础上的相位滑移方法,发现协议的缩放颗粒密度的增加,但与单位填充附近的显着偏差。

英文摘要:

We analyse the time-dependence of currents in a 1D Bose gas in an optical lattice. For a 1D system, the stability of currents induced by accelerating the lattice exhibits a broad crossover as a function of the magnitude of the acceleration, and the strength of the inter-particle interactions. This differs markedly from mean-field results in higher dimensions. Using the infinite Time Evolving Block Decimation algorithm, we characterise this crossover by making quantitative predictions for the time-dependent behaviour of the currents and their decay rate. We also compute the time-dependence of quasi-condensate fractions which can be measured directly in experiments. We compare our results to calculations based on phase-slip methods, finding agreement with the scaling as the particle density increases, but with significant deviations near unit filling.

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