Numerical Renormalization Group Analysis of Interacting Quantum Dots
| dc.creator | Hofstetter, Walter | |
| dc.date | 2001-04-17 | |
| dc.date.accessioned | 2026-07-25T21:50:41Z | |
| dc.description | Wilson's Numerical Renormalization Group (NRG) is so far the only nonperturbative technique that can reliably access low-energy properties of quantum impurity systems. We present a recent extension of the method, the DM-NRG, which yields highly accurate results for dynamical quantities at arbitrary frequencies and temperatures. As an application, we determine the spectrum of a quantum dot in an external magnetic field. Furthermore, we discuss magnetic impurities with orbital degeneracy, which have been inferred in recent experiments on quantum dots in an Aharonov-Bohm geometry. It is demonstrated that for spinless electrons, interference between neighbouring levels sets the low-energy scale of the system. Switching on an external field leads to a remarkable crossover into a regime dominated by orbital Kondo screening. We predict that the broadening-induced level splitting should be clearly visible in measurements of the optical absorption power. A more general model including the electron spin is studied within an extended two-band NRG procedure. We observe competition between interference and Kondo screening, similar to the situation in two-impurity models (RKKY). | |
| dc.description | Invited talk at the DPG spring meeting 2001, to appear in Advances in Solid State Physics 41 | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0104297 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0104297 | |
| dc.identifier | Advances in Solid State Physics 41, 27 (2001) | |
| dc.identifier.uri | https://dspace.dare.co.zw/handle/123456789/83420 | |
| dc.subject | Mesoscale and Nanoscale Physics | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Numerical Renormalization Group Analysis of Interacting Quantum Dots | |
| dc.type | text |