2003/12/31 by H. Onodera, Takami Tohyama, T. Tohyama +2 · 2 citations
Materials Science · Mathematics · Physics and Astronomy · #Absorption (acoustics) #Absorption edge #Absorption spectroscopy #Band gap #Condensed matter physics #Coupling (piping) #Curse of dimensionality #Degrees of freedom (physics and chemistry) #Electronic and Structural Properties of Oxides #Enhanced Data Rates for GSM Evolution #Hubbard model #Materials science #Mathematics #Mott insulator #Optical conductivity #Optics #Physics #Physics of Superconductivity and Magnetism #Position (finance) #Quantum and electron transport phenomena #Quantum mechanics #Spectral line #Spin (aerodynamics) #Thermodynamics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.69.245117
published as Phys. Rev. B 69, 245117 (2004) · 5 pages, 4 figures
openalex publication_date 2004/06/28 · arxiv created 2004/07/12 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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-filled 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.