论文标题
超快的强场吸收
Ultrafast strong-field absorption in gapped graphene
论文作者
论文摘要
从理论上讲，我们通过张开的石墨烯单层研究了超快光脉冲的强场吸收。在低场幅度下，原始石墨烯的吸光度等于普遍价值2.3美元的普遍价值。尽管低场幅度的超快光吸收与高场振幅的偏振（线性或圆形）无关，但该吸收在很大程度上取决于脉冲极化。对于线性极化的脉冲，光吸光度为$ \ \ \ $ \ geq 0.4〜 \ mathrm {v/Å} $的$ \ \ \ $ \ 1.4 $％的饱和度，但是对于圆形极化脉冲，未观察到这种饱和度。对于间隙的石墨烯，线性极化脉冲的吸收对带隙具有较弱的依赖性，而对于循环极化脉冲，吸收对带隙非常敏感。 ％通过放入ON（例如SIC底物）强烈修改小场振幅下的超快吸收来打开一个石墨烯。
We study theoretically the strong-field absorption of an ultrafast optical pulse by a gapped graphene monolayer. At low field amplitudes, the absorbance in the pristine graphene is equal to the universal value of $2.3$ percent. Although the ultrafast optical absorption for low field amplitudes is independent of the polarization, linear or circular, of the applied optical pulse, for high field amplitudes, the absorption strongly depends on the pulse polarization. For a linearly polarized pulse, the optical absorbance is saturated at the value of $\approx 1.4$ percent for the pulse's amplitude of $\geq 0.4~\mathrm{V/Å}$, but no such saturation is observed for a circularly polarized pulse. For the gapped graphene, the absorption of a linearly polarized pulse has a weak dependence on the bandgap, while for a circularly polarized pulse, the absorption is very sensitive to the bandgap. %Opening a bandgap in graphene by placing in on, for example, SiC substrate strongly modify the ultrafast absorption at small field amplitudes.
