Nonlinear optical response and spin-charge separation in one-dimensional Mott insulators

Details Nonlinear optical response and spin-charge separation in one-dimensional Mott insulators Nonlinear optical response and spin-charge separation in one-dimensional Mott insulators

2000-06-22

arxiv.org/abs/cond-mat/0006335v2

Phys. Rev. B 62, R4769-R4773 (2000)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages with 3 figures, to appear in PRB RC, 15 August 2000

Scientific paper

10.1103/PhysRevB.62.R4769

We theoretically study the nonlinear optical response and photoexcited states of the Mott insulators. The nonlinear optical susceptibility \chi^(3) is calculated by using the exact diagonalization technique on small clusters. From the systematic study of the dependence of \chi^(3) on dimensionality, we find that the spin-charge separation plays a crucial role in enhancing \chi^(3) in the one-dimensional (1D) Mott insulators. Based on this result, we propose a holon-doublon model, which describes the nonlinear response in the 1D Mott insulators. These findings show that the spin-charge separation will become a key concept of optoelectronic devices.

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