| Issue |
Europhys. Lett.
Volume 75, Number 3, August 2006
|
|
|---|---|---|
| Page(s) | 468 - 474 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2006-10131-8 | |
| 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
Received:
26
April
2006
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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