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arXiv 1305.0504quant-phcond-mat.str-el
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有限温度下算符空间矩阵乘积态的实时演化

Real time evolution at finite temperatures with operator space matrix product states

Iztok Pizorn, Viktor Eisler, Sabine Andergassen, Matthias Troyer

摘要:

本文提出了一种将密度矩阵和观测量同时表示为矩阵乘积态的方法,来模拟有限温度下一维量子多体系统的实时演化。这允许计算期望值和关联函数作为算子空间中的标量积。逆温度下的密度矩阵的模拟和海森堡图像中的局部算子是独立的,并导致所有中间温度和时间的期望值的网格。对于可积系统,模拟可以使用实数运算,计算资源仅以逆温度和时间的多项式增长。并以XXZ模型和单杂质Anderson模型为例说明了该方法。

英文摘要:

We propose a method to simulate the real time evolution of one dimensional quantum many-body systems at finite temperature by expressing both the density matrices and the observables as matrix product states. This allows the calculation of expectation values and correlation functions as scalar products in operator space. The simulations of density matrices in inverse temperature and the local operators in the Heisenberg picture are independent and result in a grid of expectation values for all intermediate temperatures and times. Simulations can be performed using real arithmetics with only polynomial growth of computational resources in inverse temperature and time for integrable systems. The method is illustrated for the XXZ model and the single impurity Anderson model.

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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