Abstract
Spatial behavior of excitons at high density was studied in a specific exciton system at a quasi-two-dimensional planar defect in layered Bil 3 crystals. Space- and time-resolved resonance luminescence spectra of the exciton state shows clear blue shift which was delayed in proportion to the distance from the exciting spot providing the polariton group velocity. Space- and time-resolved pump-and-probe spectra also show the blue shift and line broadening not only at the exciting point but at a distant spot away from the exciting point. These spectral changes are discussed in terms of high-density exciton polariton transport and the optical Stark effect.
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