Elfeky Bassel Heiba, Lotfizadeh Neda, Schiela William F, Strickland William M, Dartiailh Matthieu, Sardashti Kasra, Hatefipour Mehdi, Yu Peng, Pankratova Natalia, Lee Hanho, Manucharyan Vladimir E, Shabani Javad
Department of Physics, New York University, New York, New York 10003, United States.
Department of Physics, Joint Quantum Institute, and Quantum Materials Center, University of Maryland, College Park, Maryland 20742, United States.
Nano Lett. 2021 Oct 13;21(19):8274-8280. doi: 10.1021/acs.nanolett.1c02771. Epub 2021 Sep 27.
The critical current response to an applied out-of-plane magnetic field in a Josephson junction provides insight into the uniformity of its current distribution. In Josephson junctions with semiconducting weak links, the carrier density, and therefore the overall current distribution, can be modified electrostatically via metallic gates. Here, we show local control of the current distribution in an epitaxial Al-InAs Josephson junction equipped with five minigates. We demonstrate that not only can the junction width be electrostatically defined but also the current profile can be locally adjusted to form superconducting quantum interference devices. Our studies show enhanced edge conduction in such long junctions, which can be eliminated by minigates to create a uniform current distribution.
约瑟夫森结中对外加平面外磁场的临界电流响应有助于深入了解其电流分布的均匀性。在具有半导体弱连接的约瑟夫森结中，载流子密度以及整体电流分布可以通过金属栅极进行静电调制。在此，我们展示了在配备五个微栅的外延Al-InAs约瑟夫森结中对电流分布的局部控制。我们证明，不仅可以通过静电定义结的宽度，还可以局部调整电流分布以形成超导量子干涉器件。我们的研究表明，此类长结中存在增强的边缘传导，微栅可以消除这种边缘传导以创建均匀的电流分布。
