Upper-critical dimension in a quantum impurity model: Critical theory of the asymmetric pseudogap Kondo problem
| dc.creator | Vojta, Matthias | |
| dc.creator | Fritz, Lars | |
| dc.date | 2003-09-10 | |
| dc.date | 2004-03-26 | |
| dc.date.accessioned | 2026-07-07T02:53:23Z | |
| dc.date.available | 2026-07-07T02:53:23Z | |
| dc.description | Impurity moments coupled to fermions with a pseudogap density of states display a quantum phase transition between a screened and a free moment phase upon variation of the Kondo coupling. We describe the universal theory of this transition for the experimentally relevant case of particle-hole asymmetry. The theory takes the form of a crossing between effective singlet and doublet levels, interacting with low-energy fermions. Depending on the pseudogap exponent, this interaction is either relevant or irrelevant under renormalization group transformations, establishing the existence of an upper-critical "dimension" in this impurity problem. Using perturbative renormalization group techniques we compute various critical properties and compare with numerical results. | |
| dc.description | 4 pages, 2 figs, (v2) title changed, log corrections for r=1 added | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0309262 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0309262 | |
| dc.identifier | Phys. Rev. B 70, 094502 (2004) | |
| dc.identifier | doi:10.1103/PhysRevB.70.094502 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/22195 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.subject | Statistical Mechanics | |
| dc.title | Upper-critical dimension in a quantum impurity model: Critical theory of the asymmetric pseudogap Kondo problem | |
| dc.type | text |