Charge-Density-Wave Formation in the Doped Two-Leg Extended Hubbard Ladder

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Author(s)

Abstract

We investigate the electronic properties of a doped two-leg Hubbard ladder with both the onsite and nearest-neighbor Coulomb repulsions by using the weak-coupling renormalization-group method. It is shown that, for strong nearest-neighbor repulsions, the charge-density-wave state coexisting with the p-density-wave state becomes a dominant fluctuation where spins form intrachain singlets. By increasing doping rate, we have also shown that the effects of the nearest-neighbor repulsions are reduced and the system exhibits a quantum phase transition into the d-wave-like (or rung-singlet) superconducting state. We derive the effective fermion theory which describes the critical properties of the transition point with the gapless excitation of magnon. The phase diagram of the two-leg ladder compound, Sr_<14-x>Ca_x-Cu_<24>O_<41>, is discussed.

Journal

  • Journal of the Physical Society of Japan

    Journal of the Physical Society of Japan 73(4), 804-807, 2004-04-15

    The Physical Society of Japan (JPS)

References:  19

Codes

  • NII Article ID (NAID)
    110001974348
  • NII NACSIS-CAT ID (NCID)
    AA00704814
  • Text Lang
    ENG
  • Article Type
    SHO
  • ISSN
    00319015
  • NDL Article ID
    6917244
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z53-A404
  • Data Source
    CJP  NDL  NII-ELS 
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