Optical absorption of spin ladders
classification
❄️ cond-mat.str-el
keywords
opticalabsorptioncollectivespintwo-magnonclearcontinuumdemonstrated
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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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