Inhomogeneously doped two-leg ladder systems

Details Inhomogeneously doped two-leg ladder systems Inhomogeneously doped two-leg ladder systems

2002-06-18

arxiv.org/abs/cond-mat/0206344v2

Phys. Rev. B 67, 184517 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

Revtex4, 11 pages, 7 figures

Scientific paper

10.1103/PhysRevB.67.184517

A chemical potential difference between the legs of a two-leg ladder is found to be harmful for Cooper pairing. The instability of superconductivity in such systems is analyzed by compairing results of various analytical and numerical methods. Within a strong coupling approach for the t-J model, supplemented by exact numerical diagonalization, hole binding is found unstable beyond a finite, critical chemical potential difference. The spinon-holon mean field theory for the t-J model shows a clear reduction of the the BCS gaps upon increasing the chemical potential difference leading to a breakdown of superconductivity. Based on a renormalization group approach and Abelian bosonization, the doping dependent phase diagram for the weakly interacting Hubbard model with different chemical potentials was determined.

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