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Coherent contributions to population dynamics in a semiconductor microcavity



Jagannath Paul, Hendrik Rose, Ethan Swagel, Torsten Meier, Jared Wahlstrand, Alan Bristow


Multidimensional coherent spectroscopy (MDCS) is used to separate coherent and incoherent many-body contributions to the population-time dynamics in a GaAs-based semiconductor microcavity encapsulating a single InGaAs quantum well. In a three-pulse four-wave-mixing scheme, the second delay time is the population time that in MDCS probes excited-state coherences and population dynamics. Nonlinear optical interactions can mix these contributions, which are isolated here for the lower- and upper-exciton-polariton through the self- and mutual-interaction features. Results show fast decays and oscillations arising from the coherent response, including a broad stripe along the absorption energy axis, and longer time mutual-interaction features that do not obey a simple population decay model. These results are qualitatively replicated by semiconductor Bloch equation for the 1s exciton which is strongly coupled to the intracavity field. Simulations allow for separation of coherent and incoherent Pauli-blocking and Coulomb interaction terms within the chi(3)-limit, and direct comparison of each feature in rephasing and zero-quantum spectra.
Physical Review B


optical spectroscopy, exciton-polaritons, semiconductors, quantum wells


Paul, J. , Rose, H. , Swagel, E. , Meier, T. , Wahlstrand, J. and Bristow, A. (2022), Coherent contributions to population dynamics in a semiconductor microcavity, Physical Review B, [online],, (Accessed April 24, 2024)
Created March 29, 2022, Updated November 29, 2022