Impurity induced spin texture in quantum critical 2D antiferromagnets

Details Impurity induced spin texture in quantum critical 2D antiferromagnets Impurity induced spin texture in quantum critical 2D antiferromagnets

2006-11-15

arxiv.org/abs/cond-mat/0611418v2

Phys. Rev. Lett. 98, 087203 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures. Published version

Scientific paper

10.1103/PhysRevLett.98.087203

We describe the uniform and staggered magnetization distributions around a vacancy in a quantum critical two-dimensional S=1/2 antiferromagnet. The distributions are delocalized across the entire sample with a universal functional form arising from an uncompensated Berry phase. The numerical results, obtained using quantum Monte Carlo simulations of the Heisenberg model on bilayer lattices with up to approximately 10^5 spins, are in good agreement with the proposed scaling structure. We determine the exponent eta'=0.40 +/- 0.02, which governs both the staggered and uniform magnetic structure away from the impurity and also controls the impurity spin dynamics.

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