Regensburg 2004 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 3: Spin-Systeme und itinerante Magnete

TT 3.1: Vortrag

Montag, 8. März 2004, 09:30–09:45, H18

Is there a spinon-spinon interaction in the Haldane–Shastry model? — •Dirk Schuricht and Martin Greiter — Institut für Theorie der Kondensierten Materie, Universität Karlsruhe, 76128 Karlsruhe

Recently, there has been great interest in the dynamics of spinons in the Haldane–Shastry model, a paradigm for antiferromagnetic spin systems. Bernevig, Giuliano, and Laughlin [1] have presented arguments for the existence of a short-ranged, attractive interaction between the spinon excitations in this model. We reexamine their analysis and conclude that their interpretation is not correct; the spinon excitations in the Haldane–Shastry model do not interact. The spinons rather represent an ideal gas of half-fermions.

[1] B. A. Bernevig et al., Phys. Rev. Lett. 86, 3392 (2001).