Long-lived charged multiple-exciton complexes in strong magnetic fields

Details Long-lived charged multiple-exciton complexes in strong magnetic fields Long-lived charged multiple-exciton complexes in strong magnetic fields

1996-03-29

arxiv.org/abs/cond-mat/9603194v1

Physics

Condensed Matter

12 pages + 2 PostScript figures, Revtex, Submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevB.54.R2296

We consider the charged exciton complexes of an ideal two-dimensional electron-hole system in the limit of strong magnetic fields. A series of charged multiple-exciton states is identified and variational and finite-size exact diagonalization calculations are used to estimate their binding energies. We find that, because of a hidden symmetry, bound states of excitons and an additional electron cannot be created by direct optical absorption and, once created, have an infinite optical recombination lifetime. We also estimate the optical recombination rates when electron and hole layers are displaced and the hidden symmetry is violated.

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