Regensburg 2004 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 3: Spin-Systeme und itinerante Magnete

TT 3.2: Vortrag

Montag, 8. März 2004, 09:45–10:00, H18

Spectral Properties of One-Dimensional Heisenberg Antiferromagnets — •Kai P. Schmidt, Alexander Reischl, Sébastien Dusuel, and Götz S. Uhrig — Zülpicherstr. 77, D-50937 Köln, Germany

Spectral properties of the dimerized and frustrated S=1/2 spin chain are calculated by particle-conserving continuous unitary transformations (P-CUT’s). A detailed analysis of spectral weights and spectral densities for various excitation processes will be given. The results are relevant for inelastic neutron scattering (INS), Raman spectroscopy and infrared (IR) spectroscopy. The use of triplons (elementary triplets) as elementary excitations gives a new perspective for the description of low dimensional quantum spin liquids.

[1] K.P. Schmidt and G.S. Uhrig, Phys. Rev. Lett. 90, 227204 (2003)

[2] K.P. Schmidt, C. Knetter and G.S. Uhrig, cond-mat/0307678