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arXiv 1503.04993cond-mat.quant-gas
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用B-DMFT数值计算玻色-哈伯德模型的谱函数

Numerical calculation of spectral functions of the Bose-Hubbard model using B-DMFT

Jaromir Panas, Anna Kauch, Jan Kuneš, Dieter Vollhardt, Krzysztof Byczuk

摘要:

利用玻色动力学平均场论(B-DMFT)计算了三维简单立方晶格上玻色-哈伯德模型的动量相关谱函数.用连续时间量子蒙特卡罗方法求解自洽B-DMFT方程,并用最大熵方法对实频率进行解析延拓。弱,中间,和强相互作用的结果。在弱相互作用和强相互作用的极限下,结果与微扰理论的结果非常一致,而在中等相互作用下,结果有很大的不同,表明微扰方法在这种情况下不能描述相互作用玻色子的动力学.

英文摘要:

We calculate the momentum dependent spectral function of the Bose-Hubbard model on a simple cubic lattice in three dimensions within the bosonic dynamical mean-field theory (B-DMFT). The continuous-time quantum Monte Carlo method is used to solve the self-consistent B-DMFT equations together with the maximum entropy method for the analytic continuation to real frequencies. Results for weak, intermediate, and strong interactions are presented. In the limit of weak and strong interactions very good agreement with results obtained by perturbation theory is found. By contrast, at intermediate interactions the results differ significantly, indicating that in this regime perturbative methods fail do describe the dynamics of interacting bosons.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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