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4 papers · 2 filters
Band-Insulator-Metal-Mott-Insulator transition in the half--filled ionic-Hubbard chain
G. I. Japaridze, R. Hayn, P. Lombardo +1
We investigate the ground state phase diagram of the half-filled repulsive Hubbard model in the presence of a staggered ionic potential , using the continuum-limi…
Exchange integrals and magnetization distribution in BaCu2X2O7 (X=Ge,Si)
Sylvain Bertaina, Roland Hayn
Estimating the intrachain and interchain exchange constants in BaCu2X2O7 (X=Ge,Si) by means of density-functional calculations within the local spin-density approximation (LSDA) we…
Spectral density of the Hubbard-model by the continued fraction method
R. Hayn, P. Lombardo, K. Matho
We present the continued fraction method (CFM) as a new microscopic approximation to the spectral density of the Hubbard model in the correlated metal phase away from half filling.…
Crystal field theory of Co in doped ZnO
R. O. Kuzian, A. M. Daré, P. Sati +1
We present a crystal field theory of transition metal impurities in semiconductors in a trigonally distorted tetrahedral coordination. We develop a perturbative scheme to treat cov…