Department of Physics, Duke University, Durham, NC 27708, USA.
Department of Physics and Astronomy, Appalachian State University, Boone, NC 28607, USA.
Sci Adv. 2019 Sep 13;5(9):eaaw8693. doi: 10.1126/sciadv.aaw8693. eCollection 2019 Sep.
We present a study of a graphene-based Josephson junction with dedicated side gates carved from the same sheet of graphene as the junction itself. These side gates are highly efficient and allow us to modulate carrier density along either edge of the junction in a wide range. In particular, in magnetic fields in the 1- to 2-T range, we are able to populate the next Landau level, resulting in Hall plateaus with conductance that differs from the bulk filling factor. When counter-propagating quantum Hall edge states are introduced along either edge, we observe a supercurrent localized along that edge of the junction. Here, we study these supercurrents as a function of magnetic field and carrier density.
我们研究了一种基于石墨烯的约瑟夫森结，其专用边栅是从与结本身相同的石墨烯片上刻蚀而成的。这些边栅非常高效，允许我们在结的任一边缘大范围地调制载流子密度。特别是在 1 到 2T 的磁场范围内，我们能够填充到下一个朗道能级，从而在电导上产生不同于体填充因子的霍尔平台。当在任一边缘引入反向传播的量子霍尔边缘态时，我们观察到在结的该边缘处存在局域的超导电流。在这里，我们研究了这些超导电流作为磁场和载流子密度的函数。
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