Phys. Rev. Lett. 76, 2579–2582 (1996)Singularities in Optical Spectra of Quantum Spin ChainsReceived 5 January 1996; published in the issue dated 1 April 1996 The midinfrared optical absorption spectrum is reported of the one-dimensional Mott insulator Sr2CuO3. The spectrum has an asymmetric cusplike structure at 0.48 eV and is analyzed in terms of the phonon-assisted absorption in the one-dimensional quantum spin chain model. A good agreement is obtained between experiment and theory, and the exchange energy J is estimated to be J≈0.26 eV, which is consistent with the magnetic susceptibility measurement. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.76.2579
DOI:
10.1103/PhysRevLett.76.2579
PACS:
75.40.Gb, 75.50.Ee, 78.30.Hv
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