Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 28: Correlated Electrons: General Theory

TT 28.3: Vortrag

Donnerstag, 30. März 2006, 10:30–10:45, HSZ 301

Single hole dynamics in the bilayer Heisenberg model — •Christian Brünger and Fakher Assaad — Universität Würzburg

We consider a bilayer Heisenberg model exhibiting a quantum phase transition between ordered and disordered magnetic phases as a function of the interplanar coupling. Our aim is to study the following points: i) The evolution of the single particle spectral function from the disordered to ordered phase. ii) The coupling of the hole to critical magnetic fluctuations and the related fate of the quasiparticle residue in the vicinity of the critical point. As a function of decreasing interplanar coupling, the spectral function deforms continuously from its strong coupling behavior with band maximum at k^→= (π,π) to that of the planar t-J model with maximum at k^→=(π/2,π/2). Surprisingly, and on lattices up to 20 × 20 , both for static and dynamic holes, the quasiparticle residue does not seem to be affected by critical magnetic fluctuations.