Optical absorption of spin ladders

Details Optical absorption of spin ladders Optical absorption of spin ladders

1999-10-21

arxiv.org/abs/cond-mat/9910322v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.61.14307

We present a theory of phonon-assisted optical two-magnon absorption in
two-leg spin-ladders. Based on the strong intra-rung-coupling limit we show
that collective excitations of total spin S=0, 1 and 2 exist outside of the
two-magnon continuum. It is demonstrated that the singlet collective state has
a clear signature in the optical spectrum.

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