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理论物理通讯：英文版

Tunneling Dynamics of Dipolar Bosonic System with Periodically Modulated s-wave Scattering

鱼自发, 薛具奎

Published Jan 1, 2014• 0 citations
OpenAlex

Abstract

在吝啬地的三地点的 BoseHubbard 模型以内，偶极的 bosonic 气体与的通道动力学一周期性地，散布的 s 波浪的调整被调查。系统经历通道(CDT ) 的协调破坏转移在下邻居偶极子偶极子相互作用，所在地的相互作用和散布的调制 s 波浪之中源于相关效果的复杂、富有的协调通道(CT ) 。特别地，为产生 CT (CDT ) 散布的调制 s 波浪的区域是最宽(最狭窄) 什么时候所在地的相互作用和下邻居偶极子偶极子相互作用一些相关与通道精力和系统的相互作用精力有关仔细珍视，它是。为出现 CDT 的相关的值能理论上从通道精力和系统的相互作用精力被获得。

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在吝啬地的三地点的 BoseHubbard 模型以内，偶极的 bosonic 气体与的通道动力学一周期性地，散布的 s 波浪的调整被调查。系统经历通道(CDT ) 的协调破坏转移在下邻居偶极子偶极子相互作用，所在地的相互作用和散布的调制 s 波浪之中源于相关效果的复杂、富有的协调通道(CT ) 。特别地，为产生 CT (CDT ) 散布的调制 s 波浪的区域是最宽(最狭窄) 什么时候所在地的相互作用和下邻居偶极子偶极子相互作用一些相关与通道精力和系统的相互作用精力有关仔细珍视，它是。为出现 CDT 的相关的值能理论上从通道精力和系统的相互作用精力被获得。
Within the mean-field three-site Bose—Hubbard model, the tunneling dynamics of dipolar bosonic gas with a periodically modulation of s-wave scattering is investigated. The system experiences complex and rich coherent tunneling (CT)-coherent destruction of tunneling (CDT) transitions resulting from the correlated effect among the next-neighbor dipole-dipole interaction, the on-site interaction and the modulated s-wave scattering. In particular, The region of the modulated s-wave scattering for generating CT (CDT) is the widest (narrowest) when the on-site interaction and the next-neighbor dipole-dipole interaction have some correlated values, which are closely related to the tunneling energy and the interaction energy of the system. The correlated values for appearing CDT can be theoretically gained from the tunneling energy and the interaction energy of the system.
我们开发一个五井的模型因为描述 Bose 爱因斯坦冷凝物(BEC ) 的掘的动力学在 2D 套住光格子。在这个五井的模型的 BEC 的掘的动力学被调查经分解并且数字地。我们在二井、三井、五井的系统之中集中于自我套住的状态和掘的动力学的差别。为自我套住的状态和在零阶段的模式和 p 阶段模式的五套住的 BEC 的阶段图的标准被获得。我们发现标准和阶段图被在井之间的系统和阶段差别的尺寸大部分修改。五井的模型是一个好模型并且能给我们卓见进在 2D 套住的 BEC 的掘的动力学光格子。[从作者抽象]
The tunneling dynamics of a dipolar bosonic gas with repulsive interactions in a periodically driven triple-well are investigated. Because of the coupled effect of long-range dipole-dipole interaction and the short-range of on-site interaction, the increase of the repulsive atomic interactions can either suppress tunneling or enhance tunneling and, thus, the system experiences rich coherent tunneling(CT)-coherent destruction of tunneling (CDT) transitions. In particular, as the repulsive atomic interactions increase, the system can undergo CT-CDT-CT-CDT or CDT-CT-CDT-CT-CDT transitions. This cannot occur in non-dipolar gas, where the increase of the repulsive atomic interaction only suppress tunneling and the system can only undergo CT-CDT transition. We further present a good understanding of the results with the help of the quasi-energy spectrum of the system.
We have investigated how the dynamics of a quantum particle initially localized in the left boundary site under periodic driving can be manipulated via control of the right boundary site of a lattice array. Because of the adjustable coupling between the right boundary site and its nearest neighbor, we can realize either coherent destruction of tunneling to coherent tunneling (CDT-CT) transition or coherent tunneling to coherent destruction of tunneling (CT-CDT) transition, by driving the right boundary site while keeping the left boundary site driven by a periodically oscillating field with a fixed driving parameter. In addition, we have also revealed that our proposed CDT-CT transition is robust against the second-order coupling (SOC) between next-nearest-neighbor sites in a three-site system, whereas localization can be significantly enhanced by SOC in a four-site system.