One particle interchain hopping in coupled Hubbard chains

Details One particle interchain hopping in coupled Hubbard chains One particle interchain hopping in coupled Hubbard chains

1996-05-17

arxiv.org/abs/cond-mat/9605106v1

Physics

Condensed Matter

4 pages, LaTeX 3.0, 7 PostScript figures in uuencoded form

Scientific paper

10.1103/PhysRevB.54.10261

Interchain hopping in systems of coupled chains of correlated electrons is investigated by exact diagonalizations and Quantum-Monte-Carlo methods. For two weakly coupled Hubbard chains at commensurate densities (e.g. n=1/3) the splitting at the Fermi level between bonding and antibonding bands is strongly reduced (but not suppressed) by repulsive interactions extending to a few lattice spacings. The magnitude of this reduction is directly connected to the exponent $\alpha$ of the 1D Luttinger liquid. However, we show that the incoherent part of the single particle spectral function is much less affected by the interchain coupling. This suggests that incoherent interchain hopping could occur for intermediate $\alpha$ values.

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