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arXiv 1608.08200cond-mat.quant-gas
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无晶格时的Bloch振荡

Bloch oscillations in the absence of a lattice

Florian Meinert, Michael Knap, Emil Kirilov, Katharina Jag-Lauber, Mikhail B. Zvonarev, Eugene Demler, Hanns-Christoph Nägerl

摘要:

实验研究了浸没在强相互作用一维玻色液体中的杂质原子在外力作用下的量子运动。我们发现杂质的动量分布在出射布里渊区的边缘呈现出特征的布拉格反射。虽然布拉格反射通常与晶格结构相关,但在我们的强相关量子液体中,它们是由一维系统中短程晶体有序和多体散射过程的运动学约束的相互作用引起的。因此,杂质表现出周期性的动力学,我们解释为布洛赫振荡,即使量子液体是几何不变的。我们的观察得到了大规模数值模拟的支持。

英文摘要:

We experimentally investigate the quantum motion of an impurity atom that is immersed in a strongly interacting one-dimensional Bose liquid and is subject to an external force. We find that the momentum distribution of the impurity exhibits characteristic Bragg reflections at the edge of an emergent Brillouin zone. While Bragg reflections are typically associated with lattice structures, in our strongly correlated quantum liquid they result from the interplay of short-range crystalline order and kinematic constraints on the many-body scattering processes in the one-dimensional system. As a consequence, the impurity exhibits periodic dynamics that we interpret as Bloch oscillations, which arise even though the quantum liquid is translationally invariant. Our observations are supported by large-scale numerical simulations.

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