Fluctuation Diagnostics of the Electron Self-Energy: Origin of the Pseudogap Physics

We demonstrate how to identify which physical processes dominate the low-energy spectral functions of correlated electron systems. We obtain an unambiguous classification through an analysis of the equation of motion for the electron self-energy in its charge, spin, and particle-particle representat...

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Bibliographic Details
Published in:	Physical review letters Vol. 114; no. 23; p. 236402
Main Authors:	Gunnarsson, O, Schäfer, T, LeBlanc, J P F, Gull, E, Merino, J, Sangiovanni, G, Rohringer, G, Toschi, A
Format:	Journal Article
Language:	English
Published:	United States 12-06-2015
Subjects:	Classification Correlation Equations of motion Fluctuation Low energy Origins Retarding Spectra
Online Access:	Get full text
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Summary:	We demonstrate how to identify which physical processes dominate the low-energy spectral functions of correlated electron systems. We obtain an unambiguous classification through an analysis of the equation of motion for the electron self-energy in its charge, spin, and particle-particle representations. Our procedure is then employed to clarify the controversial physics responsible for the appearance of the pseudogap in correlated systems. We illustrate our method by examining the attractive and repulsive Hubbard model in two dimensions. In the latter, spin fluctuations are identified as the origin of the pseudogap, and we also explain why d-wave pairing fluctuations play a marginal role in suppressing the low-energy spectral weight, independent of their actual strength.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0031-9007 1079-7114
DOI:	10.1103/physrevlett.114.236402