Coulomb correlations effects on localized charge relaxation in the coupled quantum dots

Abstract

We analyzed localized charge time evolution in the system of two interacting quantum dots (QD) (artificial molecule) coupled with the continuous spectrum states. We demonstrated that Coulomb interaction modifies relaxation rates and is responsible for non-monotonic time evolution of the localized charge. We suggested new mechanism of this non-monotonic charge time evolution connected with charge redistribution between different relaxation channels in each QD.

Many-particle interaction in tunneling spectroscopy of Ge adatoms on the Ge(111) surface

“…Finally one can easily express matrix elements through the matrices (4), (6), (8) eigenvectors ele ments [12]: (11) The constraint on the space of the possible system states have to be taken into account: (12) Condition (12) means that the appearance of any two pseudoparticles in the system simultaneously is impossible. The further analysis of electron transport properties through the single and coupled adatoms and I(V) characteristics can be performed by means…”

“…† Deceased. 011 local electron density correlations in all orders was successfully applied for electron transport analysis in the multilevel impurity atoms and strongly coupled impurities [9][10][11].…”

Charge trapping in the system of interacting quantum dots

“…We will take into account Coulomb interaction by means of self-consistent mean field approximation [10]. It means that the initial energy level value ε has to be substituted by the valueε ¼ ε þ U Á 〈n αs ðtÞ〉 in the final expressions for the filling numbers n αs time evolution (15).…”

“…The kinetic properties of coupled QDs [1] are governed by the Coulomb interaction between the localized electrons [3,10] and depend strongly on the dots topology, which determines energy levels spacing and the coupling rates [17][18][19]. During the last decade experimental technique gives possibility of creating vertically aligned strongly interacting QDs with only one of them coupled to the continuous spectrum states [20,21].…”

External field induced switching of a tunneling current in coupled quantum dots

“…The present day experimental technique gives possibility to create QDs with a given set of parameters and to produce coupled QDs with different spatial geometries [1], [2], which give an opportunity to analyze nonequilibrium and non-stationary effects in the small size correlated structures [3], [4], [5], [6], [7], [8], [9]. Thereby the main effort in the physics of QDs is devoted to the investigation of non-equilibrium charge states and different spin configurations due to the electrons tunneling [10], [11], [12] through the system of coupled QDs in the presence of strong Coulomb interaction.…”