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Title: Role of vertex corrections in the matrix formulation of the random phase approximation for the multiorbital Hubbard model

Journal Article · · Physical Review B
 [1];  [1];  [2]; ORCiD logo [3];  [1];  [4]
  1. Goethe-Univ. Frankfurt, Frankfurt am Main (Germany)
  2. Univ. of Florida, Gainesville, FL (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Univ. of California, Santa Barbara, CA (United States)

In the framework of a multiorbital Hubbard model description of superconductivity, a matrix formulation of the superconducting pairing interaction that has been widely used is designed to treat spin, charge, and orbital fluctuations within a random phase approximation (RPA). In terms of Feynman diagrams, this takes into account particle-hole ladder and bubble contributions as expected. It turns out, however, that this matrix formulation also generates additional terms which have the diagrammatic structure of vertex corrections. Furthermore we examine these terms and discuss the relationship between the matrix-RPA superconducting pairing interaction and the Feynman diagrams that it sums.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725; FG02-05ER46236
OSTI ID:
1399530
Alternate ID(s):
OSTI ID: 1336968
Journal Information:
Physical Review B, Vol. 94, Issue 21; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 10 works
Citation information provided by
Web of Science

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Cited By (1)

Orbital selective pairing and gap structures of iron-based superconductors journal May 2017

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