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arXiv 1109.4477cond-mat.mes-hall
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耦合双点分子中的电子输运:点间耦合、声子和耗散效应的作用

Electron transport through a coupled double dot molecule: role of inter-dot coupling, phononic and dissipative effects

M. Imran, B. Tariq, M. Tahir, K. Sabeeh

摘要:

在这项工作中,我们研究了通过人工分子包括两个耦合的量子点的传导。所解决的问题是点间耦合对电子输运的作用。我们发现,通过分子的电流表现出阶梯状的功能,作为一个功能的引线之间的电压,其中的步长增加的点间耦合增加。这些阶梯状的功能消失,从引线的隧穿率增加,但我们发现,在耦合的存在下,这种平滑的行为是没有观察到,而两个扭结被视为在电流电压曲线。这表明,如果存在有限的点间耦合,则两个级别的分辨率持续存在。此外,我们还考虑了电子-声子相互作用以及耗散对系统电导的影响。声子边带的差分电导生存有限的点间耦合,即使强导致分子耦合。

英文摘要:

In this work, we have investigated conduction through an artificial molecule comprising two coupled quantum dots. The question addressed is the role of inter-dot coupling on electronic transport. We find that the current through the molecule exhibits step-like features as a function of the voltage between the leads, where the step size increases as the inter-dot coupling is increased. These step-like features disappear with increasing tunneling rate from the leads, but we find that in the presence of coupling, this smooth behavior is not observed rather two kinks are seen in the current voltage curve. This shows that the resolution of the two levels persists if there is finite inter-dot coupling. Furthermore, we also consider the effects of electron-phonon interaction as well as dissipation on conduction in this system. Phononic side bands in the differential conductance survive for finite inter-dot coupling even for strong lead to molecule coupling.

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