Continuous-time solver for quantum impurity models.
Continuous-time solver for quantum impurity models.
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DOI：
10.1103/physrevlett.97.076405
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发表时间：
2005-12
影响因子：
8.6
通讯作者：
P. Werner;A. Comanac;L. de' Medici;M. Troyer;A. Millis
中科院分区：
文献类型：
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作者：
P. Werner;A. Comanac;L. de' Medici;M. Troyer;A. Millis
我们提出了一个新的连续时间求解量子杂质模型，如那些相关的动力学平均场理论。它是基于一个随机采样的扰动扩展的杂质浴杂交参数。与蒙特卡罗和精确对角化计算的比较证实了新方法的准确性，即使在低温和强相互作用下也可以进行非常有效的模拟。作为该方法的功率的例子，我们提出的结果的动能和自由能的温度依赖性，使温度驱动的金属-绝缘体转变的准确位置。
We present a new continuous-time solver for quantum impurity models such as those relevant to dynamical mean field theory. It is based on a stochastic sampling of a perturbation expansion in the impurity-bath hybridization parameter. Comparisons with Monte Carlo and exact diagonalization calculations confirm the accuracy of the new approach, which allows very efficient simulations even at low temperatures and for strong interactions. As examples of the power of the method we present results for the temperature dependence of the kinetic energy and the free energy, enabling an accurate location of the temperature-driven metal-insulator transition.