论文标题
在双轴晶体上的石墨烯异质结构中等离子间pallonpoliton的电气操纵
Electrical manipulation of plasmon-phonon polaritons in heterostructures of graphene on biaxial crystals
论文作者
论文摘要
天然各向异性晶体中的Polaron Palliton对红外纳米晶体具有巨大的希望。但是，这些极性子的直接电控制很困难，从而阻止了主动极化器件的发展。在这里，我们提出了石墨烯在双轴晶体（α-相钼三氧化物）平板上的异质结构，理论上研究了杂交等离子体phon-Phonon polaritons，依赖于三个方面的费米烯水平：分散关系，等音频率Contours和量子旋转效果。我们证明了等离子体phonon polariton的模式的独特波长可调性以及从开放式（双曲线）到封闭（类似弓形的）ISO频率轮廓的光学拓扑转变，这是石墨烯的费米水平的增加。此外，我们观察到等离子体pallonon polaritons的可调量子旋转霍尔效应，表现出通过石墨烯的费米级调整的传播方向切换。我们的发现开放了新型电气可调的极化设备和可编程量子光学网络的机会。
Phonon polaritons in natural anisotropic crystals hold great promise for infrared nano-optics. However, the direct electrical control of these polaritons is difficult, preventing the development of active polaritonic devices. Here we propose the heterostructures of graphene on a biaxial crystal (α-phase molybdenum trioxide) slab and theoretically study the hybridized plasmon-phonon polaritons with dependence on the Fermi level of graphene from three aspects: dispersion relationships, iso-frequency contours, and the quantum spin Hall effects. We demonstrate the distinct wavelength tunability of the plasmon-phonon polaritons modes and the optical topologic transitions from open (hyperbolic) to closed (bow-tie-like) iso-frequency contours as the increase of the Fermi level of graphene. Furthermore, we observe the tunable quantum spin Hall effects of the plasmon-phonon polaritons, manifesting propagation direction switching by the Fermi level tuning of the graphene. Our findings open opportunities for novel electrically tunable polaritonic devices and programmable quantum optical networks.
