Dirac锥修饰态光调谐椭圆色散失配引起的反常Klein佯谬与入射粒子方向
Anomalous Klein paradox due to misalignment of optically-tunable elliptical dispersion for Dirac-cone dressed states and direction of incoming particles
摘要：
在推导了Dice晶格中缀饰态电子的边界条件后，研究了线极化非共振高频缀饰场作用下Dice晶格和石墨烯中的电子隧穿方形静电势垒，证明了非零入射角下的反常Klein佯谬，这是由于Dirac锥修饰态的光学可控椭圆色散与入射粒子的方向不一致造成的。这个有限的入射角取决于光偏振的类型，光致各向异性的能量色散和电子-光耦合的强度。同时，我们也观察到更大的非峰值传输振幅相比，石墨烯在骰子晶格。我们期望本文的理论结果可以应用于广泛的Dirac材料，并应用于控制电子的相干隧穿和弹道输运，以构建新型的光电子纳米开关器件。
英文摘要：
After having derived boundary conditions for dressed-state electrons in a dice lattice, we investigate the electron tunneling through a square electrostatic potential barrier in both dice lattices and graphene under a linearly-polarized off-resonance and high-frequency dressing field, and demonstrate the anomalous Klein paradox for a nonzero incident angle, resulted from the misalignment of optically-controllable elliptical dispersion for Dirac-cone dressed states and the direction of incoming kinetic particles in our system. This finite incident angle is found depending on the type of light polarization, the light-induced anisotropy in energy dispersion and the strength of electron-light coupling. Meanwhile, we also observe much larger off-peak transmission amplitudes in dice lattices in comparison with graphene. We expect the theoretical results in this paper could be used for wide range of Dirac materials and applied to controlling both coherent tunneling and ballistic transport of electrons for constructing novel optical and electronic nano-scale switching devices.
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