Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-04-27
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, 3 figures
Scientific paper
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.
Alhassid Yoram
Huertas-Hernando Daniel
No associations
LandOfFree
Extracting the ground-state spin of a quantum dot from the conductance peaks in a parallel magnetic field at finite temperature does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Extracting the ground-state spin of a quantum dot from the conductance peaks in a parallel magnetic field at finite temperature, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Extracting the ground-state spin of a quantum dot from the conductance peaks in a parallel magnetic field at finite temperature will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-510544