Long-range dynamics of magnetic impurities coupled to a two-dimensional Heisenberg antiferromagnet

Details Long-range dynamics of magnetic impurities coupled to a two-dimensional Heisenberg antiferromagnet Long-range dynamics of magnetic impurities coupled to a two-dimensional Heisenberg antiferromagnet

2004-08-27

arxiv.org/abs/cond-mat/0408598v2

Phys. Rev. B 71, 064414 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 5 figures

Scientific paper

10.1103/PhysRevB.71.064414

We consider a two-dimensional Heisenberg antiferromagnet on a square lattice with weakly coupled impurities, i.e. additional spins interacting with the host magnet by a small dimensionless coupling constant g<<1. Using linear spin-wave theory, we find that the magnetization disturbance at distance r from a single impurity behaves as g/r for 1<>1/g. Surprisingly the disturbance is inversely proportional to the coupling constant! The interaction between two impurities separated by a distance r is proportional to g^2/r for 1<>1/g. Hence at large distances, the interaction is universal and independent of the coupling constant. We also find that the frequency of Rabi oscillations between two impurities is proportional to g^2 ln(gr) at 1<

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