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

ORAL

Abstract

The one-dimensional half-filled Holstein-Hubbard model (HHM) is studied by the newly developed electron-phonon coupled functional renormalization group (ep-FRG) [1]. The ep-FRG enables us to study the electron-phonon coupled system in an unbiased manner by taking account of the scatterings at different energy scales and momenta systematically. Previous studies of the half-filled HHM showed that there is a direct transition between the charge-gapped spin-density wave (SDW) phase and the spin-charge-gapped charge-density wave (CDW) phase. Recently, it has been proposed that there is an intermediate spin-gapped metallic phase with dominant superconducting (SC) pairing correlation between SDW phase and CDW phase [2]. Our ep-FRG results show that the dominant correlation in this intermediate phase is not SC pairing. \vskip 0.3cm \noindent [1] S.-W. Tsai, A. H. Castro Neto, R. Shankar, and D. K. Campbell, Phys. Rev. B 72, 054531 (2005). \vskip 0.1cm \noindent [2] R. T. Clay and R. P. Hardikar, Phys. Rev. Lett. 95, 096401 (2005).

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Authors

  • Shan-Wen Tsai

    UC Riverside, University of California, Riverside, Physics Department, University of California, Riverside, Physics Dept., Univ. of California, Riverside

  • Ka-Ming Tam

  • David K. Campbell

    Boston University, Department of Physics, Boston University, MA 02215

  • Antonio H. Casto Neto

    Department of Physics, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, USA, Boston University, Department of Physics, Boston University, Department of Physics, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, USA