Electron and hole self-energies

FIGURE 5.5. Virtual excitations contributing to the electron and hole self-energies [2 + )(e) and 2 + >(h), respectively] in the (N + 1)-particle state. 

TABLE 5.4. Different Physical Quantities Contributing to the Formation of the Quasi-Particle Energy-Band Gap in the Alternating trans PA One-Particle Energies e(HF), Electron and Hole Self-Energies, 2(e) and 2(h), Respectively, and Quasi-Particle Energies e(QP)<2 > ... 

For an energy band state, this is given by the sum of corresponding HF energy and the electronic and hole self energies of the corresponding state which means the correlation-corrected band state. 

One can interpret the correction terms appearing in addition to the HF band energies in these equations as electron and hole self-energies [5 (e) and D(h), respectively). For this purpose one can introduce the notation... 

Figure 1 Virtual excitations contributing to the electron and hole self-energies particle state...

Free excitons can be bound to defects or become self trapped. In both cases the electron and hole will recombine, either radialively or nonradiatively. An example was discussed in Sect. 3.3.1. It will be clear that energy transfer by excitons is of a general importance and occurs in semiconductors as well as in insulators. 

Large excess carrier concentrations produced either by high fields or photon excitation are associated with an even larger non-equilibrium density of trapped electrons and holes. These in turn will modify the spatial potential fluctuations which determine the energy distribution of loc ized states and the position of the percolation thresholds. A self-consistent treatment of the electron states for different occupation functions has not yet been carried out. 

Degiorgi et al. (1990) also measured the optical properties of YbN over 4 decades of photon energy at 6K and derived the eleetronic strueture. The material is a self-eompensated semimetal just like all other lanthanide pnictides, with a small indirect band overlap of the p-band at F and the d-band at X, resulting in an equal electron and hole... 

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