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arXiv 0707.4259cond-mat.stat-mech
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费米极化子:发散符号交替序列的图解蒙特卡罗

Fermi-Polaron: Diagrammatic Monte Carlo for Divergent Sign-Alternating Series

Nikolay Prokof'ev, Boris Svistunov

摘要:

用图解蒙特卡罗方法研究了自旋向下的费米子与自旋向上的理想费米子的共振相互作用问题。一方面,我们发展了一个通用的,符号问题的宽容,方法的精确数值解的极化子型模型。另一方面,我们的解决方案是重要的,了解相图和性质的BCS-BEC交叉在强不平衡制度。这是第一个,也可能是典型的例子,说明如何将蒙特卡罗方法应用于一个发散的符号交替图解序列。

英文摘要:

Diagrammatic Monte Carlo approach is applied to a problem of a single spin-down fermion resonantly interacting with the sea of ideal spin-up fermions. On one hand, we develop a generic, sign-problem tolerant, method of exact numerical solution of polaron-type models. On the other hand, our solution is important for understanding the phase diagram and properties of the BCS-BEC crossover in the strongly imbalanced regime. This is the first, and possibly characteristic, example of how the Monte Carlo approach can be applied to a divergent sign-alternating diagrammatic series.

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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