Functional renormalization group analysis of the half-filled one-dimensional extended Hubbard model

Date Issued
2006-01-27Publisher Version
10.1103/PhysRevLett.96.036408Author(s)
Tam, Ka-Ming
Tsai, Shan-Wen
Campbell, David K.
Metadata
Show full item recordPermanent Link
https://hdl.handle.net/2144/35585Version
First author draft
Citation (published version)
KM Tam, SW Tsai, DK Campbell. 2006. "Functional renormalization group analysis of the half-filled one-dimensional extended Hubbard model." PHYSICAL REVIEW LETTERS, Volume 96, Issue 3, pp. ? - ? (4). https://doi.org/10.1103/PhysRevLett.96.036408Abstract
We study the phase diagram of the half-filled one-dimensional extended Hubbard model at weak coupling using a novel functional renormalization group (FRG) approach. The FRG method includes in a systematic manner the effects of the scattering processes involving electrons away from the Fermi points. Our results confirm the existence of a finite region of bond charge density wave, also known as a "bond order wave" near U=2V and clarify why earlier g-ology calculations have not found this phase. We argue that this is an example in which formally irrelevant corrections change the topology of the phase diagram. Whenever marginal terms lead to an accidental symmetry, this generalized FRG method may be crucial to characterize the phase diagram accurately.
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