作为分数维恩效应的离子库仑阻塞
Ionic Coulomb blockade as a fractional Wien effect
摘要：
纳米流体的最新进展已经允许探索离子传输到分子尺度的限制，但人工孔蛋白仍然远远没有达到生物离子机器的先进功能。实现可通过外部门调节的单离子传输-电子库仑阻塞（CB）的离子模拟-将在这一探索中开辟新的途径。然而，离子CB的理解超出了电子类比仍然缺乏。在这里，我们表明，在一个带电的纳米通道中的离子的多体动力学的结果在一个量子化的和强非线性的离子输运，完全符合分子模拟。我们发现，离子CB发生时，在足够的限制，带相反电荷的离子形成“Bjerrum对”，并通过一种机制，让人想起Onsager的维恩效应的传导收益。我们的研究结果开辟了新的纳米流体功能，如离子CB基离子泵的灵感来自其电子对应。
英文摘要：
Recent advances in nanofluidics have allowed exploration of ion transport down to molecular scale confinement, yet artificial porins are still far from reaching the advanced functionalities of biological ion machinery. Achieving single ion transport that is tuneable by an external gate -- the ionic analogue of electronic Coulomb blockade (CB) -- would open new avenues in this quest. However, an understanding of ionic CB beyond the electronic analogy is still lacking. Here we show that the many-body dynamics of ions in a charged nanochannel result in a quantised and strongly nonlinear ionic transport, in full agreement with molecular simulations. We find that ionic CB occurs when, upon sufficient confinement, oppositely charged ions form 'Bjerrum pairs', and the conduction proceeds through a mechanism reminiscent of Onsager's Wien effect. Our findings open the way to novel nanofluidic functionalities, such as an ionic-CB-based ion pump inspired by its electronic counterpart.
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