nextnano.NEGF

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Absorption Spectrum

With the optics features of nextnano++, the optical absorption spectrum can be calculated for various polarization directions.

The transition matrix element $H_{ab}(k)$ is plotted in the function of $\vec{k}$ for a 1D structure in figure 1

Figure 1: Transition matrix element in the $\vec{k}$ space

The first eigenfunction's energy in the kp-space is plotted in figure 2 for electrons, and in figure 3 for holes.

Figure 2: Energy dispersion relation in the $\vec{k}$ space for electrons

Figure 3: Energy dispersion relation in the $\vec{k}$ space for holes