Single molecules can be coupled to metallic electrodes when the latter are in the superconducting state. In such emerging hybrid molecular devices, the possibility of the Josephson effect, that is, the dissipation-less transport of Cooper-paired electrons from one electrode to the other, arises. In this theoretical study, we demonstrate that a junction formed by two superconductors linked by an annular molecule, of which benzene (phenylene group) is a prototype, can sustain indeed a supercurrent and work as a “single molecule superconducting field-effect transistor (SMoSFET)”. In this device, Cooper-paired electrons are transmitted via the molecule in the presence of quantum interference. Through the presented model, we show that the resonant nontrivial modulation of the critical current with an external gate voltage may be strongly modified by choosing a paracoupled, a metacoupled, or an orthocoupled molecular ring. These features are directly related to the possibility of obtaining a SMoSFET controlled by quantum interference.

中文翻译：

---

单分子超导场效应晶体管中的量子干扰

当金属电极处于超导状态时，单分子可以与金属电极耦合。在这种新兴的混合分子装置中，出现了约瑟夫森效应的可能性，即，库珀配对电子从一个电极到另一个电极的无耗散传输。在这项理论研究中，我们证明了由两个超导体形成的结，该超导体由一个以苯（亚苯基）为原型的环状分子连接，可以确实维持超电流，并可以作为“单分子超导场效应晶体管（SMoSFET） ）”。在这种装置中，在存在量子干扰的情况下，库珀配对的电子通过分子传输。通过提出的模型，我们表明，可以通过选择对偶耦合，亚耦合或正交耦合的分子环，强烈地改变外部栅极电压对临界电流的共振非平凡调制。这些特征与获得由量子干扰控制的SMoSFET的可能性直接相关。