Impurity Induced Spin Texture in Quantum Critical 2D Antiferromagnets | Zendy

Kaj H. Höglund | Zendy; Anders W. Sandvik | Zendy; Subir Sachdev | Zendy

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Impurity Induced Spin Texture in Quantum Critical 2D Antiferromagnets

Author(s) -

Kaj H. Höglund,

Anders W. Sandvik,

Subir Sachdev

Publication year - 2007

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.98.087203

Subject(s) - condensed matter physics , physics , delocalized electron , spins , antiferromagnetism , quantum monte carlo , scaling , spin (aerodynamics) , magnetization , quantum , heisenberg model , impurity , critical exponent , monte carlo method , quantum mechanics , phase transition , magnetic field , statistics , geometry , mathematics , thermodynamics

We describe the uniform and staggered magnetization distributions around avacancy in a quantum critical two-dimensional S=1/2 antiferromagnet. Thedistributions are delocalized across the entire sample with a universalfunctional form arising from an uncompensated Berry phase. The numericalresults, obtained using quantum Monte Carlo simulations of the Heisenberg modelon bilayer lattices with up to approximately 10^5 spins, are in good agreementwith the proposed scaling structure. We determine the exponent eta'=0.40 +/-0.02, which governs both the staggered and uniform magnetic structure away fromthe impurity and also controls the impurity spin dynamics.Comment: 4 pages, 3 figures. Published versio

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