Local quantum critical behavior in magnetic Kondo impurity models with partially screened moment
| dc.creator | Zhang, Guang-Ming | |
| dc.creator | Yu, Lu | |
| dc.date | 2004-12-21 | |
| dc.date | 2005-03-24 | |
| dc.date.accessioned | 2026-07-07T03:02:50Z | |
| dc.date.available | 2026-07-07T03:02:50Z | |
| dc.description | In the strong coupling limit, an effective resonant level model is derived for the spin-1 underscreened Kondo impurity model. A local quantum critical behavior is induced by the formation of a bound state with partially screened magnetic moment, displaying a residual $Z_2$ symmetry, leading to a $δ$-resonance at the Fermi level in the impurity spectral function. As a consequence, a logarithmic singularity appears in the real part of the impurity dynamic spin susceptibility as a function of $\max (ω, T)$, with $ω$ as frequency, $T$ temperature. A small magnetic field breaks this $Z_2$ symmetry and suppresses the singularity. We also discuss the possible manifestation of such a quantum critical behavior in the spin-1/2 two Kondo impurity model and the single quantum dot system with even electron occupation. | |
| dc.description | 8 pages, no figures; revised version | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0412561 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0412561 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/25538 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.subject | Mesoscale and Nanoscale Physics | |
| dc.title | Local quantum critical behavior in magnetic Kondo impurity models with partially screened moment | |
| dc.type | text |