Optical Conductivity of the Trellis-Lattice t-J Model: Charge Fluctuations in NaV_2O_5

Abstract

Optical conductivity of the trellis lattice t-J model at quarter filling is calculated by an exact-diagonalization technique on small clusters, whereby the valence state of V ions of NaV_2O_5 is considered. We show that the experimental features at \sim 1 eV, including peak positions, presence of shoulders, and anisotropic spectral weight, can be reproduced in reasonable range of parameter values, only by assuming that the system is in the charge disproportionated ground state. Possible reconciliation with experimental data suggesting the presence of uniform ladders at T>T_c is discussed.

4 pages, 4 gif figures. Minor revisions have been made. Hardcopies of figures (or the entire manuscript) can be obtained by e-mail request to [email protected]

References in corpus (4)

• NaV_2O_5 as a quarter-filled ladder compound
• Charged Magnons in NaV2O5
• Raman, infrared and optical spectra of the spin-Peierls compound NaV_2O_5
• NaV_2O_5 as an Anisotropic t-J Ladder at Quarter Filling

Cited by in corpus (14)

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• Electron Correlation Effects in Resonant Inelastic X-ray Scattering of NaV2O5
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• Theoretical study of the optical conductivity of ${\alpha }^{\prime }-Na{V}_2{O}_5$
• Optical properties and electronic structure of Ca-doped alpha'-NaV2O5
• Temperature dependence of optical spectral weights in quarter-filled ladder systems
• High frequency ESR investigation on dynamical charge disproportionation and spin gap excitation in NaV_2O_5
• One-dimensional dynamics of the d-electrons in ${\alpha }^{\prime }$-NaV${}_2$O${}_5$
• A Model Study of the Low-Energy Charge Dynamics of NaV_2O_5
• Unconventional anisotropic superexchange in NaV2O5
• Charge excitations in NaV${}_2$O${}_5$
• Optical conductivity in the CuO double chains of PrBa_2Cu_4O_8: Consequences of charge fluctuation
• Charge excitations in LiV${}_2$O${}_5$ and NaV${}_2$O${}_5$: similarities and differences
• Spin and charge excitations in the anisotropic Hubbard ladder at quarter filling with charge-ordering instability