Quantum critical properties of the Bose-Fermi Kondo Model in a large-N limit
| dc.creator | Zhu, Lijun | |
| dc.creator | Kirchner, Stefan | |
| dc.creator | Si, Qimiao | |
| dc.creator | Georges, Antoine | |
| dc.date | 2004-06-14 | |
| dc.date | 2005-01-06 | |
| dc.date.accessioned | 2026-07-25T23:12:36Z | |
| dc.description | Studies of non-Fermi liquid properties in heavy fermions have led to the current interest in the Bose-Fermi Kondo model. Here we use a dynamical large-N approach to analyze an SU(N)xSU($κN$) generalization of the model. We establish the existence in this limit of an unstable fixed point when the bosonic bath has a sub-ohmic spectrum ($|ω|^{1-ε} \sgn ω$, with $0<ε<1$). At the quantum critical point, the Kondo scale vanishes and the local spin susceptibility (which is finite on the Kondo side for κ<1) diverges. We also find an ω/T scaling for an extended range (15 decades) of ω/T. This scaling violates (for $ε\ge 1/2$) the expectation of a naive mapping to certain classical models in an extra dimension; it reflects the inherent quantum nature of the critical point. | |
| dc.description | 4 pages; v2: included clarifying discussions on why the omega/T scaling (for epsilon >=1/2) violates the naive mapping to classical models in an extra dimension and the implications of this observation about the nature of the QCP; v3: shortened to conform to the PRL length limit | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0406293 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0406293 | |
| dc.identifier | Phys.Rev.Lett. 93, 267201(2004) | |
| dc.identifier | doi:10.1103/PhysRevLett.93.267201 | |
| dc.identifier.uri | https://dspace.dare.co.zw/handle/123456789/96474 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Quantum critical properties of the Bose-Fermi Kondo Model in a large-N limit | |
| dc.type | text |