论文标题
费米子多体系统中的非局部相关效应：克服非作用问题
Non-local Correlation Effects in Fermionic Many-Body Systems: Overcoming the Non-causality Problem
论文作者
论文摘要
由准2D费米子系统的有趣物理学的激励，例如高温超导氧化物，分层过渡金属硫化质化金属质质化物或表面或界面系统，开发型的多体计算方法包括局部和非局部电子相关性，也已成为快速发展的领域。但是，已经意识到，这种方法的成功可能会因涉及的有效或可观察的数量中的非因果特征的出现而受到阻碍。在这里，我们提出了一种新的方法，即将局部多体技术（例如动力学均值理论（DMFT））扩展到非局部相关性，从而保留因果关系并具有物理直觉的解释。我们的策略对DMFT启发的多体方法的通用类具有影响，并且可以以最小的努力适应群集，双玻色子或双效率技术。
Motivated by the intriguing physics of quasi-2d fermionic systems, such as high-temperature superconducting oxides, layered transition metal chalcogenides or surface or interface systems, the development of many-body computational methods geared at including both local and non-local electronic correlations has become a rapidly evolving field. It has been realized, however, that the success of such methods can be hampered by the emergence of noncausal features in the effective or observable quantities involved. Here, we present a new approach of extending local many-body techniques such as dynamical mean field theory (DMFT) to nonlocal correlations, which preserves causality and has a physically intuitive interpretation. Our strategy has implications for the general class of DMFT-inspired many-body methods, and can be adapted to cluster, dual boson or dual fermion techniques with minimal effort.
