Angular-Dependent Klein Tunneling in Photonic Graphene,Physical Review Letters

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Angular-Dependent Klein Tunneling in Photonic Graphene
Physical Review Letters ( IF 8.1 ) Pub Date : 2022-11-30 , DOI: 10.1103/physrevlett.129.233901
Zhaoyang Zhang ₁ , Yuan Feng ₁ , Feng Li ₁ , Sergei Koniakhin _{2,

3} , Changbiao Li ₁ , Fu Liu ₁ , Yanpeng Zhang ₁ , Min Xiao _{4,

5} , Guillaume Malpuech ₂ , Dmitry Solnyshkov _{2,

6}

Affiliation

The Klein paradox consists in the perfect tunneling of relativistic particles through high potential barriers. It is responsible for the exceptional conductive properties of graphene. It was recently studied in atomic condensates and topological photonics and phononics. While in theory the perfect tunneling holds only for normal incidence, so far the angular dependence of the Klein tunneling and its strong variation with the barrier height were not measured experimentally. In this Letter, we capitalize on the versatility of atomic vapor cells with paraxial beam propagation and index patterning by electromagnetically induced transparency. We report the first experimental observation of perfect Klein transmission in a 2D photonic system (photonic graphene) at normal incidence and measure the angular dependence. Counterintuitively, but in agreement with the Dirac equation, we observe that the decay of the Klein transmission versus angle is suppressed by increasing the barrier height, a key result for the conductivity of graphene and its analogs.

中文翻译：

光子石墨烯中的角度相关克莱因隧道

克莱因悖论存在于相对论粒子通过高势垒的完美隧穿。它负责石墨烯的特殊导电性能。它最近在原子凝聚态和拓扑光子学和声子学中得到了研究。虽然理论上完美隧道仅适用于垂直入射，但到目前为止，克莱因隧道的角度依赖性及其随势垒高度的强烈变化尚未通过实验测量。在这封信中，我们利用了具有近轴光束传播和通过电磁感应透明度进行折射率图案化的原子蒸气室的多功能性。我们报告了垂直入射时二维光子系统（光子石墨烯）中完美克莱因传输的首次实验观察，并测量了角度依赖性。违反直觉，

更新日期：2022-11-30

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