Phys. Rev. Lett. 95, 087401 (2005) [4 pages]Direct Observation of Excitons and a Continuum of One-Dimensional Mott Insulators: A Reflection-Type Third-Harmonic-Generation Study of Ni-Halogen Chain CompoundsReceived 29 July 2004; published 16 August 2005 The third-harmonic-generation (THG) spectrum was measured for a NiBr-chain compound, which is a one-dimensional Mott insulator, in a reflection configuration. A sharp peak and a shoulder structure in the THG spectrum are attributed to three-photon resonance to an exciton and a continuum, respectively. The band-edge energy, the exciton binding energy, and the spectral weights for the exciton and the continuum were determined from comparative studies of linear absorption, THG, and electroreflectance spectra. The excitonic effect is more pronounced in the NiCl chain than in the NiBr chain. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.087401
DOI:
10.1103/PhysRevLett.95.087401
PACS:
78.67.−n, 42.65.Ky, 71.35.Cc
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