Shot Noise of Charge and Spin Current of a Quantum Dot Coupled to Semiconductor Electrodes
arXiv:1608.02144 · doi:10.1021/acs.jpca.5b06360
Abstract
Based on the scattering matrix theory and non-equilibrium green function method, we have investigated the fluctuations of charge and spin current of the systems which consists of a quantum dot (QD) with a resonant level coupled to two semiconductor contacts within in alternative site and alternative bond framework, where two transverse and longitudinal magnetic fields are applied to the QD. It is only necessary to use the auto-correlation function to characterize the fluctuations of charge current for a two-terminal system because of the relation which is defined as = . Our result shows that both auto-shot noise and cross-shot noise are essential to characterize the fluctuations of spin current when is present. Moreover, our model calculations show that the sign of the cross-shot noise of spin current is negative for all surface states of AS/QD/AS junctions, while it oscillates between positive and negative values for two surface states of AB/QD/AB junctions as we sweep the gate voltage.
arXiv comment10 pages, 10 figures
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