Hamburg 2001 – scientific programme

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TT: Tiefe Temperaturen

TT 25: Postersitzung III: Pinning und Vortexdynamik, Massive HTSL, Bandleiter, Transporteigenschaften in HTSL, SL dünner Filme, Elektronen und Phononen in HTSL, Tunneln, Borkarbide, Quantenphasen und Metall-Isolator-Überg
änge, Anwendungen, Sonstiges

TT 25.46: Poster

Thursday, March 29, 2001, 14:30–17:00, Rang S\ 3

The anisotropic Heisenberg chain in a transverse magnetic field. — •Felicien Capraro — Universitaet des Saarlandes, Fachbereich Physik, Postfach 15 11 50, G38, D-66041 Saarbruecken

We investigate numerically the behaviour of a spin-1/2 antiferromagnetic (AFM) anisotropic Heisenberg chain in an external magnetic field transverse to the chain direction. The hamiltonian is given by: H=∑ S_i^xS_i+1^x + S_i^yS_i+1^y + Δ S_i^zS_i+1^z − h S_i^x . In order to find the phase diagram of this model we use the density matrix renormalization group technique (DMRG). We calculate numerically the low energy spectrum.