Magneto-optical readout of dark exciton distribution in cuprous oxide

Details Magneto-optical readout of dark exciton distribution in cuprous oxide Magneto-optical readout of dark exciton distribution in cuprous oxide

2009-02-28

arxiv.org/abs/0903.0072v1

Physics

Condensed Matter

Other Condensed Matter

14 pages, 6 figures

Scientific paper

An experimental study of the yellow exciton series in Cu2O in strong magnetic fields up to 32 T shows the optical activation of direct and phonon-assisted paraexciton luminescence due to mixing with the quadruple allowed orthoexciton state. The observed phonon-assisted luminescence yields information on the statistical distribution of occupied states. Additional time-resolved experiments provide a unique opportunity to directly determine the time evolution of the thermodynamical properties of the paraexciton gas. Because the lifetime of paraexciton is hardly affected by the optical activation in a strong magnetic field, this opens new possibilities for studies aiming at Bose-Einstein condensation of excitons in bulk semiconductors.

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