论文标题
Y形kekule-Paterned石墨烯的电子光谱和光学特性：带嵌套共振作为光学签名
Electronic spectrum and optical properties of Y-shaped Kekule-patterned graphene: Band nesting resonance as an optical signature
论文作者
论文摘要
采用紧密结合模型，我们研究了均匀的Y形Kekule晶格失真对电子光谱和石墨烯光导率的影响。我们得出了一种低能的有效哈密顿量，发现与完全结合哈密顿量的对角线化计算出来的相当一致。然后，使用低能量的哈密顿量和久保公式，我们获得了用于探索化学电位，温度和现场和现场和跳跃能量偏差的详细效果的光学电导率的分析表达式。特别是，我们发现有限化学势的Y形kekue-Paterned石墨烯显示出称为带嵌套的大型光学响应。这种效果证明在升高温度方面具有鲁棒性，即使在室温下，它也促进了其作为Y形kekule失真的光学特征的检测。
Employing tight-binding model we investigate the effects of a uniform Y-shaped Kekule lattice distortion on the electronic spectrum and optical conductivity of graphene. We derive a low-energy effective Hamiltonian which is found to be in excellent agreement with one calculated from a diagonalization of the full tight-binding Hamiltonian. Then using the low-energy Hamiltonian and Kubo formula we obtain an analytical expression for the real part of the optical conductivity used to explore the effects of chemical potential, temperature and on-site and hopping energy deviations in details. In particular we find that Y-shaped Kekue-patterned graphene at finite chemical potential displays a large optical response called band nesting resonance. This effect is shown to be robust against increasing temperature, facilitating its detection as an optical signature for the Y-shaped Kekule distortion even at room temperature.
