a strict sense is formed, but the Coulomb interaction leads to a significant enhancement of absorption in the vicinity of the fundamental absorption edge also known as the Mahan or Fermi-edge singularity.

History

The concept of excitons was first proposed by Yakov Frenkel in 1931, when he described the excitation of an atomic lattice considering what is now called the tight-binding description of the band structure. In his model the electron and

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