Figure 4 | Scientific Reports

Figure 4

From: Manifestation of a Second Dirac Surface State and Bulk Bands in THz Radiation from Topological Insulators

Figure 4

Schematic for the influence of the 2nd surface state (SS) and bulk bands (BBs) on the P-polarized THz generation from p-type Bi2Te3.

BCB: bulk conduction band. BVB: bulk valance band. The 2nd SS and BBs would be responsible for the energy loss of the photoexcited electrons. Thus, the surface field induced by band-bending also results in the drift current in the narrow bandgap materials.

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