Complex Langevin study for polarons in a one-dimensional two-component Fermi gas with attractive contact interactions

Complex Langevin study for polarons in a one-dimensional two-component Fermi gas with attractive contact interactions
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具有吸引接触相互作用的一维二维费米气体中极化子的复杂朗之万研究

DOI:
10.1103/physrevresearch.3.033180
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发表时间:
2021
影响因子:
4.2
通讯作者:
Tsutsui Shoichiro
Tsutsui Shoichiro
中科院分区:
--
文献类型:
--
作者:
Doi Takahiro M.;Tajima Hiroyuki;Tsutsui Shoichiro

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我们用复朗之万法研究了具有接触吸引相互作用的一维自旋1/2费米气体中的极化子激发,这是避免量子蒙特卡罗模拟中可能出现的符号问题的一种有前途的方法。我们发现,复朗之万法在温度、相互作用强度和布居不平衡的大范围内都能正确地工作。从两点虚格林函数中提取的费米极化子能量对温度和我们所考虑的参数区域内的杂质浓度不敏感。我们的结果与热力学Bethe ansatz在零温下的解符合得很好。
We investigate a polaronic excitation in a one-dimensional spin-1/2 Fermi gas with contact attractive interactions, using the complex Langevin method, which is a promising approach to evade a possible sign problem in quantum Monte Carlo simulations. We found that the complex Langevin method works correctly in a wide range of temperature, interaction strength, and population imbalance. The Fermi polaron energy extracted from the two-point imaginary Green's function is not sensitive to the temperature and the impurity concentration in the parameter region we considered. Our results show a good agreement with the solution of the thermodynamic Bethe ansatz at zero temperature.
DOI: 10.1088/1742-6596/110/12/122005
发表时间: 2007-06
期刊: Physics Reports
影响因子: --
作者:
L. Debbio;H. Panagopoulos;Ettore Vicari Supa;S. O. Physics;U. Edinburgh;D. Physics;U. O. Cyprus;University of Pisa
通讯作者: L. Debbio;H. Panagopoulos;Ettore Vicari Supa;S. O. Physics;U. Edinburgh;D. Physics;U. O. Cyprus;University of Pisa
一维费米气体的杂质格林函数
DOI: --
发表时间: 2014
期刊:
影响因子: --
作者:
O. Gamayun;A. Pronko;M. Zvonarev
通讯作者: M. Zvonarev
DOI: --
发表时间: 2007
期刊:
影响因子: --
作者:
D. Tahara;M. Imada;田原大資;M. Imada;M. Imada;M. Imada
通讯作者: M. Imada