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High-precision numerical solution of the Fermi polaron problem and large-order behavior of its diagrammatic series

机译:费米极化子问题的高精度数值解及其图解级数的高阶行为

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摘要

We introduce a simple determinant diagrammatic Monte Carlo algorithm to compute the ground-state properties of a particle interacting with a Fermi sea through a zero-range interaction. The fermionic sign does not cause any fundamental problem when going to high diagram orders, and we reach order N = 30. The data reveal that the diagrammatic series diverges exponentially as (-1 /R)~N with a radius of convergence R < 1. Furthermore, on the polaron side of the polaron-dimeron transition, the value of R is determined by a special class of three-body diagrams, corresponding to repeated scattering of the impurity between two particles of the Fermi sea. A power-counting argument explains why finite R is possible for zero-range interactions in three dimensions. Resumming the divergent series through a conformal mapping yields the polaron energy with record accuracy.
机译:我们引入一种简单的行列式图解蒙特卡洛算法,以计算通过零距离相互作用与费米海相互作用的粒子的基态性质。当达到高阶图阶时,费米离子符号不会引起任何基本问题,并且我们达到阶数N =30。数据显示,图解级数以(-1 / R)〜N呈指数发散,收敛半径R <1此外,在极化子-二聚体转变的极化子侧,R的值由一类特殊的三体图确定,这对应于费米海的两个粒子之间杂质的重复散射。幂计数的参数解释了为什么有限的R对于三个维度中的零范围交互作用都是可能的。通过保形映射恢复发散级数,将产生具有记录精度的极化子能量。

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  • 来源
    《Physical review》 |2020年第4期|045134.1-045134.14|共14页
  • 作者单位

    Laboratoire de Physique de I 'Ecole Normale Superieure ENS - Universite PSL CNRS Sorbonne Universite Universite de Paris 24 rue Lhomond 75005 Paris France;

    Laboratoire Kastler Brossel Ecole Normale Superieure - Universite PSL CNRS Sorbonne Universite College de France 24 rue Lhomond 75005 Paris France;

    Center for Computational Quantum Physics Flatiron Institute 162 Fifth Avenue New York New York 10010 USA;

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