Effective projection theory in a correlated electron system

We propose an efficient method for nonperturbative calculation of Green's function in a correlated electron system. The key idea of the method is to project out irrelevant operators having zero norm in the ground state, which we refer to as effective projection theory. We apply the method to a...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2010-12, Vol.22 (48), p.485604-485604
Main Authors: Yi, Juyeon, Kim, Seongjin, Um, Jaegon, Hwang, Sun-Yong, Go, Ara, Jeon, Gun Sang
Format: Article
Language:English
Subjects:
Atomic and molecular physics
Electron correlation calculations for atoms and molecules
Electronic structure of atoms, molecules and their ions: theory
Exact sciences and technology
Physics
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Summary:We propose an efficient method for nonperturbative calculation of Green's function in a correlated electron system. The key idea of the method is to project out irrelevant operators having zero norm in the ground state, which we refer to as effective projection theory. We apply the method to a mesoscopic Anderson model and show that for a given wavefunction ansatz, equations of motion can be closed only by relevant operators, allowing easy calculation of the zero-temperature Green's function. It turns out that the resulting Green's functions reproduce exact limits of both weak and strong interactions. The accuracy is also verified for small systems by comparison with exact diagonalization results, revealing that effective projection theory captures the essential correlated features in the entire regime of interactions.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/22/48/485604