Charge on the quantum dot in the presence of tunneling current

Details Charge on the quantum dot in the presence of tunneling current Charge on the quantum dot in the presence of tunneling current

2000-03-22

arxiv.org/abs/cond-mat/0003358v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 2 (.eps) figures, to be published in Solid State Commun

Scientific paper

10.1016/S0038-1098(00)00146-0

The calculation of the charge present in central region of the double barrier structure at non-equilibrium conditions is discussed. We propose here a simple method to calculate non equilibrium Green's functions which allows consistent calculations of retarded and distribution functions. To illustrate the approach we calculate the charge on the quantum dot coupled {\it via} tunnel barriers to two external leads having different chemical potentials $\mu_L$ and $\mu_R$. The obtained results have been compared with other approaches existing in the literature. They all agree in the equilibrium situation and the departures grow with increasing the difference $\mu_L-\mu_R$.

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