论文标题
Corbino几何形状中石墨电子的Klein-Antiklein隧道的直接证据
Direct evidence of Klein-antiKlein tunneling of graphitic electrons in a Corbino geometry
论文作者
论文摘要
传统上，在Hallbar磁聚焦设置中对单层石墨烯P-N结中电子光学的传输测量进行了负折射和手性传递实验。我们展示了克莱因（单层）和抗Klein（Bilayer）隧道的直接特征，该隧道具有由封闭式石墨烯P-N连接的圆形“无蚀” Corbino几何形状。特别是引人注目的是双层石墨烯的磁连导数据中的角甜点（Brewster角度）的外观，该数据可最大程度地减少正面的传输，这与常规的菲涅尔光学元件或单层石墨烯相反，该光学烯或单层石墨烯显示出透明的透射路径的锐化准则。双层磁电导量上的局部最大值随着掺杂密度的增加而迁移到较高的磁场。这些实验结果与详细的数值模拟和分析预测非常吻合。
Transport measurement of electron optics in monolayer graphene p-n junction devices has been traditionally studied with negative refraction and chiral transmission experiments in Hallbar magnetic focusing set-ups. We show direct signatures of Klein (monolayer) and anti-Klein (bilayer) tunneling with a circular 'edgeless' Corbino geometry made out of gated graphene p-n junctions. Noticeable in particular is the appearance of angular sweet spots (Brewster angles) in the magnetoconductance data of bilayer graphene, which minimizes head-on transmission, contrary to conventional Fresnel optics or monolayer graphene which shows instead a sharpened collimation of transmission paths. The local maxima on the bilayer magnetoconductance plots migrate to higher fields with increasing doping density. These experimental results are in good agreement with detailed numerical simulations and analytical predictions.
