This article has an erratum: [erratum]
Volume 75, Number 3, August 2006
|Page(s)||468 - 474|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||30 June 2006|
Giant ground- and excited-state optical nonlinearity in one-dimensional cuprates
Laser Physics Application section, Raja Ramanna Centre for Advanced Technology Indore 452013, India
Accepted: 9 June 2006
We present a mechanism of giant optical nonlinearity in one-dimensional Mott-Hubbard insulators and predict a few orders of magnitude higher excited-state optical non-linearity compared to that from the ground state. We show that not only the first excited one- and two-photon states are nearly degenerate but also higher-energy excited one- and two-photon states with very large dipole coupling between them are so. This is the cause for huge optical nonlinearity and higher excited-state optical nonlinearity. We also predict the presence of a higher-energy two-photon state through various optical properties to be experimentally verified. The gigantic excited-state optical nonlinearity predicted for Mott-Hubbard insulators, perhaps, may make these systems suitable for application in terahertz sources.
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 78.20.Bh – Optical properties of bulk materials and thin films: Theory, models, and numerical simulation / 42.65.-k – Nonlinear optics
© EDP Sciences, 2006
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