期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 25, 期 11, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/0953-8984/25/11/115302
关键词
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资金
- US-Israel Binational Science Foundation
- FP7 Marie Curie IOF project HJSC
- Center for Nanoscience and Nanotechnology at Tel Aviv University
The dynamics of correlated electrons in quantum impurity models is typically described within the nonequilibrium Green function formalism combined with a suitable approximation. One common approach is based on the equation-of-motion technique often used to describe different regimes of the dynamic response. Here, we show that this approach may violate certain symmetry relations that must be fulfilled by the definition of the Green functions. These broken symmetries can lead to unphysical behaviour. To circumvent this pathological shortcoming of the equation-of-motion approach we provide a scheme to restore basic symmetry relations. Illustrations are given for the Anderson and double Anderson impurity models.
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