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

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    Date Issued
    2006-01-27
    Publisher Version
    10.1103/PhysRevLett.96.036408
    Author(s)
    Tam, Ka-Ming
    Tsai, Shan-Wen
    Campbell, David K.
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    Permanent Link
    https://hdl.handle.net/2144/35585
    Version
    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.96.036408
    Abstract
    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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