Quantum impurity in an antiferromagnet: non-linear sigma model theory
| dc.creator | Sachdev, Subir | |
| dc.creator | Vojta, Matthias | |
| dc.date | 2003-03-03 | |
| dc.date | 2003-03-04 | |
| dc.date.accessioned | 2026-07-07T02:49:51Z | |
| dc.date.available | 2026-07-07T02:49:51Z | |
| dc.description | We present a new formulation of the theory of an arbitrary quantum impurity in an antiferromagnet, using the O(3) non-linear sigma model. We obtain the low temperature expansion for the impurity spin susceptibilities of antiferromagnets with magnetic long-range order in the ground state. We also consider the bulk quantum phase transition in d=2 to the gapped paramagnet (d is the spatial dimension): the impurity is described solely by a topological Berry phase term which is an exactly marginal perturbation to the critical theory. The physical properties of the quantum impurity near criticality are obtained by an expansion in (d-1). | |
| dc.description | 14 pages, 7 figures; (v2) added ref | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0303001 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0303001 | |
| dc.identifier | Phys.Rev. B68 (2003) 064419 | |
| dc.identifier | doi:10.1103/PhysRevB.68.064419 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/20958 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.subject | Superconductivity | |
| dc.subject | High Energy Physics - Theory | |
| dc.title | Quantum impurity in an antiferromagnet: non-linear sigma model theory | |
| dc.type | text |