Abstract
The dephasing time of the Z3 exciton-polariton in CuCl is investigated using a new time resolved coherent technique. The measurements performed both as a function of polariton frequency and crystal temperature allow a precise determination of the redistribution channels of the initial energy between the various degrees of freedom of the crystal. The results show that relaxation is mediated by the acoustic phonons at low temperature and by the longitudinal optic phonons at high temperature (T ⩾ 40 K). The dephasing time of the longitudinal exciton is also measured and the results are compared to those obtained for the transverse mode.
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