1208.6370 (Tomosuke Aono)

Electrical and thermoelectrical transport in Dirac fermions through a
quantum dot    [PDF]

Tomosuke Aono

We investigate the linear conductance and the thermopower through a quantum dot between two electrodes of Dirac fermions with a pseudogap Anderson model using the non-crossing approximation. When the Fermi level is at the Dirac point, the conductance shows a valley, where the thermopower changes its sign. The conductance shows a peak when the Fermi level away from the Dirac point, where the impurity moment changes sharply, indicating a transition between an asymmetric strong coupling Kondo state and a localized moment state. The thermopower changes its sign in the vicinity of the peak. The magnitude of the thermopower can be more than $k_B/e$.

View original: http://arxiv.org/abs/1208.6370