Hard-core bosonic domain walls on a honeycomb lattice

Hard-core bosonic domain walls on a honeycomb lattice
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蜂窝晶格上的硬核玻色域壁

DOI:
10.1103/physreva.101.063609
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发表时间:
2020-05
期刊:
影响因子:
2.9
通讯作者:
Feng Shiping
Feng Shiping
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zhu Xingchuan;Li Bo;Guo Huaiming;Feng Shiping

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用量子蒙特卡罗模拟方法研究了蜂窝晶格上交错势场中的线状硬核玻色畴壁。绘制了具有锯齿形畴壁和扶手椅形畴壁的带的相图,其中包含在不同填充物处的超流相和绝缘体相。在$\ensuremath{\rho}=\frac{1}{2}$绝缘体中,畴壁将具有相反Berry曲率的两个电荷密度波区域分隔开。随着畴壁拓扑性质的改变,超流输运沿畴壁向下发生。由于沿着畴壁被占据和未被占据的位置的不同排列,与之字形畴壁相关的超流密度比扶手椅型畴壁的超流密度大得多。我们的结果为研究玻色子拓扑现象提供了一个具体的背景,这可能是实验模拟玻色子冷原子被困在光学晶格。
Linelike hard-core bosonic domain walls in a staggered potential on a honeycomb lattice are studied using quantum Monte Carlo simulations. The phase diagrams of ribbons with zigzag and armchair domain walls are mapped, which contain superfluid and insulator phases at various fillings. In the $\ensuremath{\rho}=\frac{1}{2}$ insulator, the domain wall separates two charge-density-wave regions with opposite Berry curvatures. Associated with the change of topological properties, superfluid transport occurs down the domain wall. The superfluid density associated with a zigzag domain wall is much larger than that of an armchair domain wall due to the different arrangements of occupied and unoccupied sites along the domain wall. Our results provide a concrete context to study bosonic topological phenomena, which may be simulated experimentally using bosonic cold atoms trapped in optical lattices.
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