Hund and pair-hopping signature in transport properties of degenerate nanoscale devices

摘要

We investigate the signature of a complete Coulomb interaction in transportproperties of double-orbital nanoscale devices. We analyze the specific effectsof Hund exchange and pair hopping terms, calculating in particular stabilitydiagrams. It turns out that a crude model, with partial Coulomb interaction,may lead to a misinterpretation of experiments. In addition, it is shown thatspectral weight transfers induced by gate and bias voltages strongly influencecharge current. The low temperature regime is also investigated, displayinginelastic cotunneling associated with the exchange term, as well as Kondoconductance enhancement.