Ionization degree of the electron-hole plasma in semiconductor quantum wells

Details Ionization degree of the electron-hole plasma in semiconductor quantum wells Ionization degree of the electron-hole plasma in semiconductor quantum wells

1999-06-07

arxiv.org/abs/cond-mat/9906100v1

Phys. Rev. B 60, 5570 (1999)

Physics

Condensed Matter

Statistical Mechanics

22 pages, 6 figures

Scientific paper

10.1103/PhysRevB.60.5570

The degree of ionization of a nondegenerate two-dimensional electron-hole plasma is calculated using the modified law of mass action, which takes into account all bound and unbound states in a screened Coulomb potential. Application of the variable phase method to this potential allows us to treat scattering and bound states on the same footing. Inclusion of the scattering states leads to a strong deviation from the standard law of mass action. A qualitative difference between mid- and wide-gap semiconductors is demonstrated. For wide-gap semiconductors at room temperature, when the bare exciton binding energy is of the order of T, the equilibrium consists of an almost equal mixture of correlated electron-hole pairs and uncorrelated free carriers.

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