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arXiv 1411.5960cond-mat.quant-gas
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么正极限下零程相互作用费米气体的Monte Carlo计算

Monte Carlo calculations for Fermi gases in the unitary limit with a zero-range interaction

Renato Pessoa, S. A. Vitiello, K. E. Schmidt

摘要:

用变分法和扩散蒙特卡罗方法研究了在幺正极限下具有零程吸引势的超冷费米气体。以前的计算使用有限范围的相互作用,并将结果外推到零范围。在这里,我们扩展了量子蒙特卡罗方法,直接使用零程相互作用,而无需外推。我们采用了一个试验波函数与正确的边界条件,并修改了采样程序,以处理零程相互作用。结果可靠,方差小。

英文摘要:

An ultracold Fermi gas with a zero-range attractive potential in the unitary limit is investigated using variational and diffusion Monte Carlo methods. Previous calculations have used a finite range interactions and extrapolate the results to zero-range. Here we extend the quantum Monte Carlo method to directly use a zero-range interaction without extrapolation. We employ a trial wave function with the correct boundary conditions, and modify the sampling procedures to handle the zero-range interaction. The results are reliable and have low variance.

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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