Department of Physics, Lomonosov Moscow State University, 119991 Moscow, Russia.
P.N. Lebedev Physical Institute RAS, 119991 Moscow, Russia.
Phys Rev E. 2018 Feb;97(2-1):022135. doi: 10.1103/PhysRevE.97.022135.
Here we demonstrate that the dynamics of few-electron states in a correlated quantum-dot system coupled to an electronic reservoir is governed by the symmetry properties of the total system leading to the collective behavior of all the electrons. Time evolution of two-electron states in a correlated double quantum dot after coupling to the reservoir has been analyzed by means of kinetic equations for pseudoparticle occupation numbers with constraint on possible physical states. It was revealed that the absolute value of the spin correlation function and the degree of entanglement for two-electron states could considerably increase after coupling to the reservoir. The obtained results demonstrate the possibility of a controllable tuning of both the spin correlation function and the concurrence value in a coupled quantum-dot system by changing of the gate voltage applied to the barrier separating the dots.
在这里，我们证明了与电子储库耦合的关联量子点系统中少子态的动力学是由整个系统的对称性质决定的，这导致了所有电子的集体行为。通过对具有可能物理状态约束的赝粒子占据数的动力学方程，分析了关联双量子点中两个电子态耦合到储库后的时间演化。结果表明，耦合到储库后，两个电子态的自旋关联函数的绝对值和纠缠度可以大大增加。所得到的结果表明，通过改变分隔点的势垒上施加的栅极电压，可以在耦合量子点系统中可控地调节自旋关联函数和并合值。
