Berlin 2005 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 16: Posters Correlated Electrons, Measuring Devices, Cryotechnique

TT 16.80: Poster

Samstag, 5. März 2005, 11:00–16:30, Poster TU C

Single hole dynamics across magnetic order-disorder quantum phase transitions. — •Christian Brünger and Fakher Assaad — Universität Würzburg

We consider a bi-layer Heisenberg model with interplanar (intraplanar) exchange J_⊥ (J). It is known that as a function of J_⊥/J the model shows an order-disorder quantum phase transition. Our aim is to understand the behavior of the single particle spectral function of a doped hole in this magnetic background. In particular, the question of the vanishing of the quasiparticle weight in the vicinity of the quantum phase transition will be addressed. Our calculations are done within a self-consistent Born approximation as well as with the quantum Monte Carlo loop algorithm.