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5 papers · 2 filters
Optical Conductivity of the Trellis-Lattice t-J Model: Charge Fluctuations in NaV_2O_5
S. Nishimoto, Y. Ohta
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…
A Model Study of the Low-Energy Charge Dynamics of NaV_2O_5
S. Nishimoto, Y. Ohta
An exact-diagonalization technique on small clusters is used to calculate the dynamical density correlation functions of the dimerized t-J chain and coupled anisotropic t-J ladders…
NaV_2O_5 as an Anisotropic t-J Ladder at Quarter Filling
S. Nishimoto, Y. Ohta
Based on recent experimental evidences that the electronic charge degrees of freedom plays an essential role in the spin-Peierls--like phase transition of NaVO, we first ma…
Critical Dimerization Strength of the Quarter-Filled t-J Model
S. Nishimoto, Y. Ohta
An exact-diagonalization technique on small clusters is used to study the ground state of the dimerized t-J model at quarter filling. The equal-time charge and spin correlations, c…
Ground-state phase diagram of the one-dimensional dimerized t-J model at quarter filling
S. Nishimoto, Y. Ohta
The ground state of the one-dimensional dimerized model at quarter filling is studied by a Lanczos exact-diagonalization technique on small clusters. We calculate the cha…