In semiconductors, an absorbed photon can create a bound electron-hole pair called an exciton, which dominates the optical spectrum at low temperatures.
, it can kick an electron from the valence band to the conduction band, causing absorption.
Since there is no gap, metals can absorb light at very low energies. However, above a certain frequency (the plasma frequency ), metals actually become transparent because the electrons can no longer keep up with the light's oscillation. 3. Key Optical Constants
In semiconductors, an absorbed photon can create a bound electron-hole pair called an exciton, which dominates the optical spectrum at low temperatures.
, it can kick an electron from the valence band to the conduction band, causing absorption.
Since there is no gap, metals can absorb light at very low energies. However, above a certain frequency (the plasma frequency ), metals actually become transparent because the electrons can no longer keep up with the light's oscillation. 3. Key Optical Constants
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