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Context 1
... used to plot the band structures. The position of the Fermi level in the band structure of these crystals is shown by the zero on the energy scale and that of symmetry points are indicated by vertical lines on the band graph in Figure 1 and Figure 2. In all the two cases, there is an important characteristic of the band structure, namely the range of energies where there are no electronic states across the entire Brillouin zone; this is the band gap. We notice that the band below zero shows that all the bands are fully occupied since there are eight valence electrons in each of these solid. ...
Context 2
... is the hallmark of metallic behaviors that is, the availability of state immediately below and imme- diately above the Fermi level, which makes it possible to excite electrons thermally. Figure 1 shows the GaAs band structure and the bottom valence band indicate an s-like atom character which is localized on an anion splits off from the rest of the valence band antisymmetry gap. This gap grows with in- creasing ionicity or charge transfer. ...
Context 3
... energy band gap shown in Table 1 is seen as the difference between the conduction band and the valence band which is calculated to be 0.38 eV. Figure 1 also shows the Density of state of GaAs as a diamond structure semiconductor; we divide the densi- ty of state into three general regions while analyzing. The first region is the most tightly bound energy band where electron states corresponding to this band are strongly localized on the anion and are descendants of the atomic As in 4 s state. ...
