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Madhanagopal B

How much heat energy will be released, if any, while an excited electron relaxes into the valence band in a direct band-gap material?

When electrons of a direct band-gap material are excited by photons (from laser source) from conduction to valence band, how much are energy will be emitted in the form of heat during its subsequent recombination with the hole?

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    Eric Isaacs

    For a semiconductor with a direct band gap, the k-vector of the valence band maximum (VBM) and conduction band minimum (CBM) are the same. This means that it is possible for the excited electron to relax down to the valence band without the emission or absorption of a phonon to ensure crystal momentum conservation.

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