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arXiv 1306.6315cond-mat.str-el
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非平衡动力学平均场论的哈密顿杂质解

Hamiltonian-based impurity solver for nonequilibrium dynamical mean-field theory

Christian Gramsch, Karsten Balzer, Martin Eckstein, Marcus Kollar

摘要:

本文导出了从非平衡动力学平均场论(DMFT)作用到含时单杂质Anderson模型(SIAM)的精确映射,该映射可以通过精确对角化数值求解。非平衡DMFT作用的SIAM的可表示性被建立为非平衡格林函数的一个相当普遍的性质。我们也得到了非平衡DMFT方程单独使用腔方法。我们展示了如何使用Cholesky或特征向量矩阵分解数值获得SIAM参数。作为一个应用,我们使用基于Krylov的时间传播方法来研究哈伯德模型,其中跳跃是打开的,从原子极限。讨论了未来可能的发展。

英文摘要:

We derive an exact mapping from the action of nonequilibrium dynamical mean-field theory (DMFT) to a single-impurity Anderson model (SIAM) with time-dependent parameters, which can be solved numerically by exact diagonalization. The representability of the nonequilibrium DMFT action by a SIAM is established as a rather general property of nonequilibrium Green functions. We also obtain the nonequilibrium DMFT equations using the cavity method alone. We show how to numerically obtain the SIAM parameters using Cholesky or eigenvector matrix decompositions. As an application, we use a Krylov-based time propagation method to investigate the Hubbard model in which the hopping is switched on, starting from the atomic limit. Possible future developments are discussed.

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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