Temperature and Dimensionality Dependences of Optical Absorption Spectra in Mott Insulators

Abstract

We investigate the temperature dependence of optical absorption spectra of one-dimensional (1D) and two-dimensional (2D) Mott insulators by using an effective model in the strong-coupling limit of a half-filed Hubbard model. In the numerically exact diagonalization calculations on finite-size clusters, we find that in 1D the energy position of the absorption edge is almost independent of temperature, while in 2D the edge position shifts to lower energy with increasing temperature. The different temperature dependence between 1D and 2D is attributed to the difference of the coupling of the charge and spin degrees of freedom. The implications of the results on experiments are discussed in terms of the dimensionality dependence.

arXiv comment5 pages, 4 figures

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Cited by in corpus (6)

• Exact diagonalization study of optical conductivity in two-dimensional Hubbard model
• Temperature dependent optical conductivity of undoped cuprates with weak exchange
• Density matrix renormalization group study of optical conductivity in the one-dimensional Mott insulator Sr_2CuO_3
• Density-matrix renormalization group study of optical conductivity of the Mott insulator for two-dimensional clusters
• Low-temperature density matrix renormalization group using regulated polynomial expansion
• Symmetry of Photoexcited States and Large-Shift Raman Scattering in Two-Dimensional Mott Insulators