Dynamics of exciton–polariton emission in CuI
We report on temperature-dependent (10 K – 250 K) spectral and dynamical properties of free exciton–polariton and bound exciton emission in copper iodide (CuI) bulk single crystals analyzed by means of time-resolved photoluminescence spectroscopy. The characteristic line shape of the polariton emiss...
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| Veröffentlicht in: | APL materials 2021-12, Vol.9 (12), p.121102-121102-12 |
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| creator | Krüger, Evgeny Bar, Michael S. Blaurock, Steffen Trefflich, Lukas Hildebrandt, Ron Müller, Andreas Herrfurth, Oliver Benndorf, Gabriele von Wenckstern, Holger Krautscheid, Harald Grundmann, Marius Sturm, Chris |
| description | We report on temperature-dependent (10 K – 250 K) spectral and dynamical properties of free exciton–polariton and bound exciton emission in copper iodide (CuI) bulk single crystals analyzed by means of time-resolved photoluminescence spectroscopy. The characteristic line shape of the polariton emission at low temperatures is interpreted in terms of the “k-linear term effect” on the degenerate Z1,2 excitons in CuI. For free exciton–polaritons, an increase in the decay time with increasing temperature up to 360 ps at 160 K is observed. For bound exciton emission, decay times between 180 ps and 380 ps are observed at low temperatures, revealing the expected EB3/2 dependence of radiative lifetime on the localization energy. Based on the observed rise times of bound excitons at low temperatures, a defect density of shallow acceptors of 1 × 1017 cm−3 was estimated, in agreement with measured room temperature free hole density. |
| doi_str_mv | 10.1063/5.0066176 |
| format | Article |
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The characteristic line shape of the polariton emission at low temperatures is interpreted in terms of the “k-linear term effect” on the degenerate Z1,2 excitons in CuI. For free exciton–polaritons, an increase in the decay time with increasing temperature up to 360 ps at 160 K is observed. For bound exciton emission, decay times between 180 ps and 380 ps are observed at low temperatures, revealing the expected EB3/2 dependence of radiative lifetime on the localization energy. 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| title | Dynamics of exciton–polariton emission in CuI |
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