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Chinese Physics Letters

Controlling the Directed Quantum Transport of Ultracold Atoms in an Optical Lattice with a Periodic Driving Field

Dong, Gong, Ming Ming, Zou, Xubo, Guo, Guang-Can

Published Jan 1, 2015• 0 citations
OpenAlex

Abstract

我们建议一个新方法在一个一个维的光格子控制 ultracold 原子的指导的量运输。在这个建议，在附近的地点之间的有效通道能被调节外部地的阶段经由通道的协调破坏调整，而不是使用开车的地紧张或频率，因此， ultracold 原子的指导的量运输能协调地以一种容易得多的方式被控制。我们的建议克服 Creffield 等使用的方法的主要缺点。[Phys。加快。Lett。99 (2007 ) 110501 ] ，并且原则上，能在任何一个维的光格子被实现。计划的一些潜在的应用也被讨论。

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我们建议一个新方法在一个一个维的光格子控制 ultracold 原子的指导的量运输。在这个建议，在附近的地点之间的有效通道能被调节外部地的阶段经由通道的协调破坏调整，而不是使用开车的地紧张或频率，因此， ultracold 原子的指导的量运输能协调地以一种容易得多的方式被控制。我们的建议克服 Creffield 等使用的方法的主要缺点。[Phys。加快。Lett。99 (2007 ) 110501 ] ，并且原则上，能在任何一个维的光格子被实现。计划的一些潜在的应用也被讨论。
We propose a new method to control the directed quantum transport of ultracold atoms in a one-dimensional optical lattice. In this proposal, the effective tunneling between the neighboring sites can be adjusted via coherent destruction of tunneling by tuning the phase of the external field, instead of using the driving field intensity or the frequency, thus the directed quantum transport of ultracold atoms can be coherently controlled in a much easier manner. Our proposal overcomes the major drawback of the method used by Creffield et al. [ Phys. Rev. Lett. 99 (2007) 110501 ], and can be implemented, in principle, in any one-dimensional optical lattice. Some potential applications of the scheme are also discussed.
拓扑泵浦是受拓扑保护的定向粒子输运，近年来在超冷原子、光子晶体等实验平台中已被广泛实现. 粒子间相互作用无处不在，为拓扑泵浦带来了新的调控自由度. 为进一步探究相互作用系统中的拓扑输运规律，本文研究了一维相互作用广义 Aubry-André-Harper 模型中两粒子束缚态的拓扑泵浦行为. 只考虑在位相互作用，除同位束缚态拓扑泵浦外，还存在一种新奇的邻位束缚态泵浦模式，即两粒子始终保持相邻占据并作为整体进行拓扑泵浦. 在绝热周期驱动下，两类束缚态均可作为复合准粒子实现量子化泵浦，经过一个泵浦周期，其质心位移取决于对应能带的陈数. 在开边界条件下，系统中存在这两类束缚态的边缘模式，其可以通过边缘态-体态混合泵浦模式从系统一侧边缘输运到另一侧边缘. 本研究揭示了邻位束缚对拓扑泵浦这一新颖的输运模式，丰富了两体拓扑泵浦的物理图像，为相互作用系统中的拓扑输运研究提供了新的视角.
Coherent directed quantum transport of ultracold rubidium atoms in an optical realization of a quantum rocking ratchet is investigated experimentally. By changing parameters of the underlying periodic modulations we resolve transport resonances in the mean momentum of a dilute atomic Bose-Einstein condensate. These resonances are attributed to the avoided crossings between Floquet eigenstates which are widely separated on the energy scale. By increasing the amplitude of the drive we observe a theoretically predicted bifurcation of a single-peak resonance into a doublet. Our results prove the feasibility of fine experimental control over nonequlibrium, coherent quantum transport in ac-driven optical lattices