Bimodal Momentum Distribution of the High-Density Supersolid State
Bimodal Momentum Distribution of the High-Density Supersolid State
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高密度超固态的双峰动量分布
DOI：
10.1007/s10909-012-0794-1
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发表时间：
2013
影响因子：
2
通讯作者：
Naoki Kawashima
中科院分区：
文献类型：
--
作者：
Takahiro Ohgoe;Takafumi Suzuki;Naoki Kawashima
通过执行精确的量子蒙特卡罗模拟，我们研究了具有最近邻斥力的二维扩展 Bose-Hubbard 模型中超固态的动量分布。对于强的最近邻排斥力，超固态在大跳跃幅度和高粒子密度的广阔区域内是稳定的。在超固体状态下，动量分布呈现双峰结构，有两个峰值分别与超流动性和固体性相关。通过我们的计算，我们表明，随着化学势（或颗粒密度）的增加，双峰结构变得更加清晰。
By performing exact quantum Monte Carlo simulations, we study the momentum distribution of the supersolid state in the two-dimensional extended Bose-Hubbard model with the nearest-neighbor repulsion. For strong nearest-neighbor repulsions, the supersolid state is stable in a broad region up to large hopping amplitudes and high particle densities. In the supersolid state, the momentum distribution shows a bimodal structure with two peaks related to the superfluidity and solidity respectively. By our calculations, we show that the bimodal structure becomes clearer as the chemical potential (or the particle density) is increased.