Hund and pair-hopping signature in transport properties of degenerate nanoscale devices
arXiv:1307.4549 · doi:10.1140/epjb/e2013-40177-1
Abstract
We investigate the signature of a complete Coulomb interaction in transport properties of double-orbital nanoscale devices. We analyze the specific effects of Hund exchange and pair hopping terms, calculating in particular stability diagrams. It turns out that a crude model, with partial Coulomb interaction, may lead to a misinterpretation of experiments. In addition, it is shown that spectral weight transfers induced by gate and bias voltages strongly influence charge current. The low temperature regime is also investigated, displaying inelastic cotunneling associated with the exchange term, as well as Kondo conductance enhancement.
5 pages, 4 figures
References in corpus (5)
- Four-electron shell structures and an interacting two-electron system in carbon nanotube quantum dots
- Kondo Effects in Carbon Nanotubes: From SU(4) to SU(2) symmetry
- Correlated electron physics in multilevel quantum dots: phase transitions, transport, and experiment
- Study of Hund's rule coupling in models of magnetic impurities and quantum dots
- Three-orbital Kondo effect in single quantum dot system with plural electrons