1999/10/21 by Christoph Jurecka, C. Jurecka, Wolfram Brenig +1 · 1 citation
Physics and Astronomy · #Absorption (acoustics) #Condensed matter physics #Coupling (piping) #Excited state #Ferromagnetism #Limit (mathematics) #Magnetic properties of thin films #Magnon #Materials science #Optics #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum mechanics #Singlet state #Spin (aerodynamics) #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.61.14307
4 pages, 3 figures
arxiv created 1999/10/21 · openalex publication_date 2000/06/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.