论文标题
电磁辐射下倾斜的各向异性狄拉克材料的浮光光谱和电子过渡:单片矩阵方法
Floquet spectrum and electronic transitions of tilted anisotropic Dirac materials under electromagnetic radiation: monodromy matrix approach
论文作者
论文摘要
我们分析了倾斜的各向异性狄拉克材料的导频转换概率的变速器 - 光谱和价值,以线性和圆形极化的电磁场。胶质 - 光谱是根据schrödinger方程的单构矩阵通过浮quet定理计算的,用于任意强烈的电磁场。为了鉴定传导波段过渡时间的价,我们在旋转波近似中推导了一个类似狂犬病的公式。在强场状态下,频谱与动量成分的函数分为两个非常独特的区域。在第一个位于狄拉克点附近的第一个中,由于电子参数通过电子饰面重新归一致,因此磁场显着扭曲了准光谱。在第二个中,保留了自由载流子光谱的所有特性。线性极化光各向异性会根据场极化方向变形。原始狄拉克点周围形成类似狄拉克的点。相反,圆形光的准频谱在狄拉克点上表现出间隙形成,并具有椭圆形的对称性。我们表明,与表征弱场态度的单光子共振转变相反,强场状态以多光子共振为主。
We analyze the quasienergy-spectrum and the valence to conduction-band transition probabilities of a tilted anisotropic Dirac material subject to linearly and circularly polarized electromagnetic fields. The quasienergy-spectrum is numerically calculated from the monodromy matrix of the Schrödinger equation via the Floquet theorem for arbitrarily intense electromagnetic fields. To asses the valence to conduction-band transition times we deduced a Rabi-like formula in the rotating wave approximation. In the strong-field regime the spectrum as a function of the momentum components divides into two very distinctive regions. In the first, located around the Dirac point, the quasi-spectrum is significantly distorted by the field as the electronic parameters are renormalized by electronic-dressing. In the second, all the characteristics of the free carrier spectrum are retained. Linearly polarized light anisotropically deforms the spectrum according to the field polarization direction. Dirac-like points form around the original Dirac point. The quasi spectrum of circularly polarized light, instead, exhibits a gap formation in the Dirac point and has elliptical symmetry. We show that, in contrast to the single-photon resonant transitions that characterize the weak-field regime, the strong-field regime is dominated by multiphoton resonances.