One-dimensional electron gas interacting with a Heisenberg spin-1/2 chain

Details One-dimensional electron gas interacting with a Heisenberg spin-1/2 chain One-dimensional electron gas interacting with a Heisenberg spin-1/2 chain

1999-09-20

arxiv.org/abs/cond-mat/9909296v2

Phys. Rev. B 64,033103 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages

Scientific paper

10.1103/PhysRevB.64.033103

We analyse a model of a one-dimensional electron gas interacting with an antiferromagnetic Heisenberg spin-1/2 chain via the spin exchange interactions. Using a solution at a special limit, we characterize the gapless modes of the spin gap fixed point at weak coupling $ J_{K}\ll J_{H},E_{F} $. we show that the only gapless pairing mode with divergent susceptibility is a composite odd-parity odd-frequency singlet pairing order parameter, while the ordinary BCS even-parity singlet pairing mode is incoherent. For 2-leg ladder systems, we note that it is possible to have a range of doping where the chemical potential cuts only the anti-bonding band while the bonding band remains half-filled. We propose that, in such a state, the 2-leg ladder is effectively realizing the one-dimensional Kondo-Heisenberg model.

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