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Open Quantum Systems Decoherence Quantum Simulation Entanglement Theory Quantum Correlations Quantum Thermodynamics

Quantum impurity in a nearly critical two-dimensional antiferromagnet.

PubMed
Authors: Sachdev S, Buragohain C, Vojta M

Year

1999

Paper ID

13334

Status

Peer-reviewed

Abstract Read

~2 min

Abstract Words

113

Citations

177

Abstract

The spin dynamics of an arbitrary localized impurity in an insulating two-dimensional antiferromagnet, across the host transition from a paramagnet with a spin gap to a Neel state, is described. The impurity spin susceptibility has a Curie-like divergence at the quantum-critical coupling, but with a universal effective spin that is neither an integer nor a half-odd integer. In the Neel state, the transverse impurity susceptibility is a universal number divided by the host spin stiffness (which determines the energy cost to slow twists in the orientation of the Neel order). These and numerous other results for the thermodynamics, Knight shift, and magnon damping have important applications in experiments on layered transition metal oxides.

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  • The spin dynamics of an arbitrary localized impurity in an insulating two-dimensional antiferromagnet, across the host transition from a paramagnet with a spin gap to a Neel...

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References & Citation Signals

[1] DOI https://doi.org/10.1126/science.286.5449.2479 [2] Publisher https://pubmed.ncbi.nlm.nih.gov/10617456/

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External citation index: OpenAlex citation signal • updated 2026-10-21 15:17:35

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