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arXiv 0705.3962cond-mat.mes-hall
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人工分子中电子离域的电荷输运谱研究

Mapping electron delocalization by charge transport spectroscopy in an artificial molecule

M. R. Graeber, M. Weiss, D. Keller, S. Oberholzer, C. Schoenenberger

摘要:

在这封信中,我们提出了一个实验实现的量子力学教科书的例子,两个相互作用的电子量子态杂交形成一个分子状态。在我们的具体实现中,量子态本身被制造成分子(碳纳米管)中的量子点。对于两个量子态之间足够的量子力学相互作用(隧道耦合),分子波函数是两个孤立(点)波函数的叠加。结果,电子变得离域,形成共价键。在这项工作中,我们表明,电输运可以作为一个敏感的探针来测量作为门电压的函数的叠加态中的两个组件的相对重量。对于碳纳米管双量子点领域,这一发现代表了迈向量子态工程的又一步。

英文摘要:

In this letter we present an experimental realization of the quantum mechanics textbook example of two interacting electronic quantum states that hybridize forming a molecular state. In our particular realization, the quantum states themselves are fabricated as quantum dots in a molecule, a carbon nanotube. For sufficient quantum-mechanical interaction (tunnel coupling) between the two quantum states, the molecular wavefunction is a superposition of the two isolated (dot) wavefunctions. As a result, the electron becomes delocalized and a covalent bond forms. In this work, we show that electrical transport can be used as a sensitive probe to measure the relative weight of the two components in the superposition state as a function of the gate-voltages. For the field of carbon nanotube double quantum dots, the findings represent an additional step towards the engineering of quantum states.

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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