Pillet J-D, Benzoni V, Griesmar J, Smirr J-L, Girit Ç Ö
Φ0, JEIP, USR 3573 CNRS , Collège de France, PSL University , 11, place Marcelin Berthelot, 75231 Paris Cedex 05, France.
LSI, CEA/DRF/IRAMIS , Ecole Polytechnique, CNRS, Institut Polytechnique de Paris , F-91128 Palaiseau , France.
Nano Lett. 2019 Oct 9;19(10):7138-7143. doi: 10.1021/acs.nanolett.9b02686. Epub 2019 Sep 9.
We propose the "Andreev molecule," an artificial quantum system composed of two closely spaced Josephson junctions. The coupling between Josephson junctions in an Andreev molecule occurs through the overlap and hybridization of the junction's "atomic" orbitals, Andreev Bound States. A striking consequence is that the supercurrent flowing through one junction depends on the superconducting phase difference across the other junction. Using the Bogolubiov-de-Gennes formalism, we derive the energy spectrum and nonlocal current-phase relation for arbitrary separation. We demonstrate the possibility of creating a φ-junction and propose experiments to verify our predictions. Andreev molecules may have potential applications in quantum information, metrology, sensing, and molecular simulation.
我们提出了“安德列夫分子”，这是一种由两个紧密间隔的约瑟夫森结组成的人工量子系统。安德列夫分子中约瑟夫森结之间的耦合是通过结的“原子”轨道（安德列夫束缚态）的重叠和杂化发生的。一个显著的结果是，流过一个结的超电流取决于另一个结上的超导相位差。使用博戈留波夫 - 德热纳形式理论，我们推导出了任意间距下的能谱和非局域电流 - 相位关系。我们展示了创建一个φ结的可能性，并提出了验证我们预测的实验。安德列夫分子可能在量子信息、计量学、传感和分子模拟等方面有潜在应用。
