Dresden 2003 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 11: Postersitzung II (Metall-Isolator-Überg
änge, Phasenüberg
änge in Quantensystemen, Theorie: Systeme korrelierter Elektronen)
TT 11.11: Poster
Dienstag, 25. März 2003, 14:30–19:00, P2c, P2d
Charge and spin-dynamics in the quarter-filled ladder compound NaV2O5 — •Felicien Capraro and Claudius Gros — Universitaet des Saarlandes, Fachbereich Physik, Postfach 15 11 50, G38, D-66041 Saarbruecken
We investigate the low energy spectrum of an effective intra- and inter-ladder charge-spin Hamiltonian for the quarter-filled ladder compound NaV2O5. The Hamiltonian consists of two coupled quantum spin-1/2 chains and is given by:
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The low energy spectrum of this model is explored by exact diagonalization for small system-sizes and using the Density Matrix Renormalization Group (DMRG) technique for larger system-sizes and for some limiting case using a self-consistent Mean-Field approach.