On the applicability of an equation of motion method at low-temperatures: comments on cond-mat/0309458 and cond-mat/0308413
| dc.creator | Oguri, Akira | |
| dc.date | 2003-10-07 | |
| dc.date.accessioned | 2026-07-07T02:54:01Z | |
| dc.date.available | 2026-07-07T02:54:01Z | |
| dc.description | The equation of motion method (EOM) is one of the approximations to calculate transport coefficients of interacting electron systems. The method is known to be useful to examine high-temperature properties. However, sometimes a naive application of the EOM fails to capture an important physics at low-energy scale, and it happens in recent preprints cond-mat/0309458 and cond-mat/0308413 which study a series of quantum dots. These preprints concluded that a unitarity-limit transport due to the Kondo resonance, which has been deduced from a Fermi-liquid behavior of the self-energy at T=0, $ω=0$ [A.O., PRB {\bf 63}, 115305 (2001)], does not occur. We show that the EOM self-energy obtained with a finite cluster has accidentally a singular $1/ω$ dependence around the Fermi energy, and it misleads one to the result incompatible with a Fermi-liquid ground state. | |
| dc.description | 4 pages | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0310139 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0310139 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/22382 | |
| dc.subject | Mesoscale and Nanoscale Physics | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | On the applicability of an equation of motion method at low-temperatures: comments on cond-mat/0309458 and cond-mat/0308413 | |
| dc.type | text |