Coherent backscattering of Bose-Einstein condensates in two-dimensional disorder potentials.
Coherent backscattering of Bose-Einstein condensates in two-dimensional disorder potentials.
复制标题
二维无序势中玻色-爱因斯坦凝聚体的相干反向散射。
DOI：
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发表时间：
2008
影响因子：
8.6
通讯作者：
P. Schlagheck
中科院分区：
文献类型：
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作者：
M. Hartung;T. Wellens;C. Müller;K. Richter;P. Schlagheck
我们研究二维无序势中相互作用的玻色-爱因斯坦凝聚态的量子输运。在原子-原子相互作用消失的极限下，观察到散射物质波的角度分辨密度中的尖锥体，这是由沿反向散射路径传播的振幅之间的相长干涉引起的。弱相互作用将这种相干反向散射峰转变为明显的下降，表明破坏性干扰而不是相长性干扰。我们通过非线性存在下弱局域化的图解理论重现了这个结果，该结果是通过 Gross-Pitaevskii 方程的数值积分获得的。
We study quantum transport of an interacting Bose-Einstein condensate in a two-dimensional disorder potential. In the limit of a vanishing atom-atom interaction, a sharp cone in the angle-resolved density of the scattered matter wave is observed, arising from constructive interference between amplitudes propagating along reversed scattering paths. Weak interaction transforms this coherent backscattering peak into a pronounced dip, indicating destructive instead of constructive interference. We reproduce this result, obtained from the numerical integration of the Gross-Pitaevskii equation, by a diagrammatic theory of weak localization in the presence of nonlinearity.