The effect of Coulomb correlations on the nonequilibrium charge redistribution tuned by a tunneling currentстатья
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Дата последнего поиска статьи во внешних источниках: 19 июля 2013 г.
Аннотация:It was shown that tunneling current flowing through a system with
Coulomb correlations leads to charge redistribution between the
different localized states. Simple model consisting of two electron
levels have been analyzed by means of Heisenberg motion equations
taking into account all order correlations of electron filling
numbers in localized states exactly. We consider various relations
between Coulomb interaction and localized electron energies. Sudden
jumps of electron density at each level in a certain range of
applied bias have been found. We found that for some parameter range
inverse occupation in the two-level system appeared due to Coulomb
correlations. It was shown also that Coulomb correlations lead to
appearance of negative tunneling conductivity at certain relation
between the values of tunneling rates from the two electronic
levels.