Extracting the ground-state spin of a quantum dot from the conductance peaks in a parallel magnetic field at finite temperature
| dc.creator | Huertas-Hernando, Daniel | |
| dc.creator | Alhassid, Y. | |
| dc.date | 2004-04-27 | |
| dc.date.accessioned | 2026-07-25T23:09:23Z | |
| dc.description | We derive a closed expression for the finite-temperature conductance of a Coulomb-blockade quantum dot in the presence of an exchange interaction and a parallel magnetic field. Parallel-field dependence of Coulomb-blockade peak position has been used to determine experimentally the ground-state spin of quantum dots. We find that for a realistic value of the exchange interaction, the peak motion can be significantly affected at temperatures as low as kT ~ 0.1 Delta, with Delta being the mean level spacing in the dot. This temperature effect can lead to misidentification of the ground-state spin when a level crossing occurs at low fields. We propose an improved method to determine unambiguously the ground-state spin. This method takes into account level crossings and temperature effects at a finite exchange interaction. | |
| dc.description | 4 pages, 3 figures | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0404619 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0404619 | |
| dc.identifier.uri | https://dspace.dare.co.zw/handle/123456789/95909 | |
| dc.subject | Mesoscale and Nanoscale Physics | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Extracting the ground-state spin of a quantum dot from the conductance peaks in a parallel magnetic field at finite temperature | |
| dc.type | text |