dc.contributor.author Metlitski, Max dc.contributor.author Sachdev, Subir dc.date.accessioned 2012-01-10T16:37:40Z dc.date.issued 2008 dc.identifier.citation Metlitski, Max, and Subir Sachdev. 2008. Edge and impurity response in two-dimensional quantum antiferromagnets. Physical Review B 78(17): 174410. en_US dc.identifier.issn 1550-235X en_US dc.identifier.uri http://nrs.harvard.edu/urn-3:HUL.InstRepos:7431917 dc.description.abstract Motivated by recent Monte Carlo simulations of Höglund and Sandvik (arXiv:0808.0408), we study edge response in square lattice quantum antiferromagnets. We use the $O(3)$ nonlinear σ model to compute the decay asymptotics of the staggered magnetization, energy density, and local magnetic susceptibility away from the edge. We find that the total edge susceptibility is negative and diverges logarithmically as the temperature $T\rightarrow 0$. We confirm the predictions of the continuum theory by performing a $1/S$ expansion of the microscopic Heisenberg model with the edge. We propose a qualitative explanation of the edge dimerization seen in Monte Carlo simulations by a theory of valence-bond-solid correlations in the Néel state. We also discuss the extension of the latter theory to the response of a single nonmagnetic impurity, and its connection to the theory of the deconfined critical point. en_US dc.description.sponsorship Physics en_US dc.language.iso en_US en_US dc.publisher American Physical Society en_US dc.relation.isversionof doi://10.1103/PhysRevB.78.174410 en_US dc.relation.hasversion http://arxiv.org/abs/0808.0496 en_US dash.license OAP dc.subject strongly correlated electrons en_US dc.title Edge and Impurity Response in Two-Dimensional Quantum Antiferromagnets en_US dc.type Journal Article en_US dc.description.version Author's Original en_US dc.relation.journal Physical Review B en_US dash.depositing.author Sachdev, Subir dc.date.available 2012-01-10T16:37:40Z dc.identifier.doi 10.1103/PhysRevB.78.174410 * dash.contributor.affiliated Sachdev, Subir
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