Quantum phases of strongly interacting bosons on a two-leg Haldane ladder
Quantum phases of strongly interacting bosons on a two-leg Haldane ladder
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DOI：
10.1103/physreva.97.033619
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发表时间：
2017-10
影响因子：
2.9
通讯作者：
S. Greschner;F. Heidrich-Meisner
中科院分区：
文献类型：
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作者：
S. Greschner;F. Heidrich-Meisner
我们研究了六角两腿梯形几何上的单分量Halfton模型的基态物理，特别关注强相互作用的玻色子。我们集中我们的分析制度的每单位细胞小于一个粒子。作为一个主要的结果，我们观察到几个迈斯纳样和涡旋流体相，无论是超流体以及莫特绝缘背景。此外，我们表明，强相互作用玻色子粒子，一个非常规的涡格相出现，这是稳定的，即使在硬核玻色子的政权。我们讨论的机制，其稳定的有限相互作用的分析近似的手段。我们展示了如何通过测量最近邻和次最近邻手征电流以及它们的特征动量分布来辨别不同的相位。
We study the ground-state physics of a single-component Haldane model on a hexagonal two-leg ladder geometry with a particular focus on strongly interacting bosonic particles. We concentrate our analysis on the regime of less than one particle per unit cell. As a main result, we observe several Meissner-like and vortex-fluid phases, both for a superfluid as well as a Mott-insulating background. Furthermore, we show that for strongly interacting bosonic particles, an unconventional vortex-lattice phase emerges, which is stable even in the regime of hard-core bosons. We discuss the mechanism for its stabilization for finite interactions by a means of an analytical approximation. We show how the different phases may be discerned by measuring the nearest-and next-nearest-neighbor chiral currents as well as their characteristic momentum distributions.