Multi-particle excitations and spectral densities in quantum spin-systems

Details Multi-particle excitations and spectral densities in quantum spin-systems Multi-particle excitations and spectral densities in quantum spin-systems

2001-07-25

arxiv.org/abs/cond-mat/0107526v1

Physica B 312, 527 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

2 pages, 1 figure; submitted to the proceedings of the SCES2001 conference (Physica B)

Scientific paper

10.1016/S0921-4526(01)01333-3

The excitation spectrum of the 2-leg S=1/2 Heisenberg ladder is examined perturbatively. Using an optimally chosen continuous unitary transformation we expand the Hamiltonian and the Raman operator about the limit of isolated rungs leading to high order series expansions allowing to calculate spectral densities quantitatively. The 2-particle sector is examined for total momentum k=0. We show that triplet-triplet interaction gives rise to a band splitting.

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