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arXiv 1003.1861cond-mat.mes-hall
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库仑关联对同心量子环-量子点结构中电子输运的影响

Effect of Coulomb correlation on electron transport through concentric quantum ring-quantum dot structure

T. Chwiej, K. Kutorasinski

摘要:

从理论上研究了单电子通过两端量子环与中心带电点的电容耦合的转移。为此,我们求解了由转移电子和第二粒子组成的完全关联的两粒子系统的含时薛定谔方程。对Ahronov-Bohm效应中透射几率随磁场变化的分析表明,库仑相互作用对透射几率的极大值既有增强作用,又有排斥作用,这两种相互作用对透射几率的极大值都有减小作用。系统中库仑关联的存在也可能导致电子的非弹性散射,在这种情况下,对于(n+1/2)个磁通量量子,电子通过环的传输不会被完全阻断。

英文摘要:

We theoretically study the single electron transfer through two-terminal quantum ring capacitively coupled to charged dot placed in its center. For this purpose we solve time-dependent Schrodinger equation for fully correlated two-particle system constituted by the transferred electron and the second particle confined in the dot. Analysis of transmission probability dependence on magnetic field in Ahronov-Bohm effect indicates that the maxima of transmission probability may be enhanced as well as reduced for attractive or repulsive Coulomb interaction respectively. The existence of Coulomb correlation in the system may also lead to inelastic scattering of the transferred electron. In such case, transmission of electron thorugh the ring is not completely blocked for (n+1/2) magnetic flux quanta.

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