Two-hole dynamics in spin ladders

Details Two-hole dynamics in spin ladders Two-hole dynamics in spin ladders

2001-07-17

arxiv.org/abs/cond-mat/0107365v2

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 8 figures; added references

Scientific paper

We present an analytic theory for the energy spectrum of a two-leg spin ladder doped with two holes. Starting from a pseudo-fermion-bond-boson representation of the corresponding $t_{1,2}-J_{1,2}$ Hamiltonian we apply a diagrammatic approach adapted to the limit of strong rung coupling, which includes both, the coupling of holes to the spin background as well as the two-hole interactions. The two-hole spectrum is calculated and the formation of bound states is discussed. Additionally the evolution of the spin gap of the ladder upon doping is analyzed. A comparison with existing exact diagonalization data is presented and good agreement is found.

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