Quantum Hall–based superconducting interference device
Quantum Hall–based superconducting interference device
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DOI：
10.1126/sciadv.aaw8693
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发表时间：
2019-01
期刊：
影响因子：
13.6
通讯作者：
A. Seredinski;A. Draelos;E. Arnault;M. Wei;Hengming Li;T. Fleming;Kenji Watanabe;T. Taniguchi;F. Amet;G. Finkelstein
中科院分区：
文献类型：
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作者：
A. Seredinski;A. Draelos;E. Arnault;M. Wei;Hengming Li;T. Fleming;Kenji Watanabe;T. Taniguchi;F. Amet;G. Finkelstein
将超导性推向边缘：物理学家利用量子霍尔边缘态制造了 SQUID。我们提出了一项基于石墨烯的约瑟夫森结的研究，其专用侧门由与结本身相同的石墨烯片雕刻而成。这些侧栅极效率很高，使我们能够在大范围内调制沿结的任一边缘的载流子密度。特别是，在 1 至 2 T 范围内的磁场中，我们能够填充下一个朗道能级，从而导致霍尔平台的电导与体积填充因子不同。当沿任一边缘引入反向传播的量子霍尔边缘态时，我们观察到沿结的该边缘局部存在超电流。在这里，我们研究这些超电流作为磁场和载流子密度的函数。
Pushing superconductivity to the edge: Physicists make a SQUID using quantum Hall edge states. 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.