论文标题
在暴露于Abrikosov Flux晶格的石墨烯中狄拉克电子的霍尔效应
Hall Effect for Dirac Electrons in Graphene Exposed to an Abrikosov Flux Lattice
论文作者
论文摘要
通过将量子霍尔效应与超导性耦合实现外来颗粒的建议涉及空间不均匀的磁场。作为朝着这个目标迈出的一步，我们在理论上还是在实验上研究了暴露于Abrikosov通量晶格的狄拉克电子系统。从理论上讲，我们发现不均匀的磁场会导致载体密度降低霍尔电导率。我们的研究表明，这种还原源于一种相当微妙的效果：在不均匀的磁场扩大的Landau水平内的浆果曲率的悬浮。在实验上，我们测量单层石墨烯二甲状腺氮化硼 - 二烷 - 苯乙烯（NBSE $ _2 $）异质结构，并找到石墨烯的密度依赖于密度的霍尔电阻率，因为该温度降低了nbse $ _2 $ _2 $ _2 $ _2 $ _2的密度依赖于高度降低，因为该温度降低了。束成Abrikosov通量晶格。
The proposals for realizing exotic particles through coupling of quantum Hall effect to superconductivity involve spatially non-uniform magnetic fields. As a step toward that goal, we study, both theoretically and experimentally, a system of Dirac electrons exposed to an Abrikosov flux lattice. We theoretically find that non-uniform magnetic field causes a carrier-density dependent reduction of the Hall conductivity. Our studies show that this reduction originates from a rather subtle effect: a levitation of the Berry curvature within Landau levels broadened by the non-uniform magnetic field. Experimentally, we measure the magneto-transport in a monolayer graphene-hexagonal boron nitride - niobium diselenide (NbSe$_2$) heterostructure, and find a density-dependent reduction of the Hall resistivity of graphene as the temperature is lowered from above the superconducting critical temperature of NbSe$_2$, when the magnetic field is uniform, to below, where the magnetic field bunches into an Abrikosov flux lattice.
