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Earlier theoretical works have generally employed the classical approach where the exciton "hops" from one lattice site to another, the so called exciton hopping model. In more recent years, this model has been replaced by modern approaches based on the quantum coherence properties of the exciton. In the coherent propagation scheme, the exciton is modelled ...


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One of the most important attribute of an exciton is its binding energy. This energy is calculated by subtracting the exciton energy from the difference in energy levels of the conduction and valence bands. The binding energy is NOT the same as the exciton energy. So the exciton is stable when its binding energy exceed zero. When Pauli blocking mechanism ...


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Z3 or Z1, Z2 excitons are labelled according to the locations of the peaks in the emission spectra of materials. These emission peaks are superimposed on the main band spectra linked to transitions between the conduction and valence bands. The occurrence of the various excitons can be attributed to the properties of the material system, such as the strength ...



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