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arXiv 0902.0753cond-mat.mes-hallcond-mat.other
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碳纳米管量子泵

Carbon nanotube quantum pumps

L. Oroszlany, V. Zolyomi, C. J. Lambert

摘要:

最近已经制造出由长的固定的内部碳纳米管和短的、缓慢旋转的外管组成的纳米机械装置。在这封信中,我们研究了使用这种设备作为绝热量子泵的可能性。使用Brouwer公式,我们采用格林函数技术来确定从内管的一端到另一端的泵浦电荷,由手性外纳米管的旋转驱动。我们发现,实际上没有泵,如果两个纳米管的手性角是相同的,但最佳的手性泵的电荷可以是一个显着的分数的理论上限。

英文摘要:

Recently nanomechanical devices composed of a long stationary inner carbon nanotube and a shorter, slowly-rotating outer tube have been fabricated. In this Letter, we study the possibility of using such devices as adiabatic quantum pumps. Using the Brouwer formula, we employ a Green's function technique to determine the pumped charge from one end of the inner tube to the other, driven by the rotation of a chiral outer nanotube. We show that there is virtually no pumping if the chiral angle of the two nanotubes is the same, but for optimal chiralities the pumped charge can be a significant fraction of a theoretical upper bound.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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