We report on the occupation of the lower exciton–polariton branch
in a ZnO-based microcavity as a function of the detuning between the exciton
and the uncoupled cavity-photon mode and on the optical excitation density.
We emphasize the difference in the dispersion and occupation of the lower
polariton branch as a function of the linear polarization of the emitted light.
For the negative detuning regime, we found an energy splitting between the
transverse electric (TE)- and transverse magnetic (TM)-polarized states at inplane
wave vectors between 0.4×107 m−1 and 1.2×107 m−1, which is caused
by the polarization dependence of the dispersion of the uncoupled cavity-photon
mode. The maximum energy splitting of about 6 meV was observed for a
detuning of about 1 = −70 meV. From the integrated photoluminescence peak,
we deduce the occupation of the lower polariton branch as well as the scattering
rates of exciton–polaritons into the lower polariton branch. We found that the
energy splitting causes an enhanced scattering of exciton–polaritons into
the lower polariton branch for the TM-polarized light compared with that of the
TE-polarized light. By varying the excitation density, we observe a superlinear
growth of the lower polariton branch occupation for negative and intermediate
detuning regimes. For an accumulation of exciton–polaritons in the ground state
at low temperatures (T = 10 K), we found an intermediate detuning regime
(−20 meV < 1 < +20 meV) as the optimum. With increasing temperature, this
optimum detuning range shifts to larger negative values.
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:80184 |
| Date | 27 July 2022 |
| Creators | Sturm, Chris, Hilmer, Helena, Schmidt-Grund, Rüdiger, Grundmann, Marius |
| Publisher | IOP Publishing |
| Source Sets | Hochschulschriftenserver (HSSS) der SLUB Dresden |
| Language | English |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, doc-type:article, info:eu-repo/semantics/article, doc-type:Text |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 033014 |
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