English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

The optical properties of excitonic molecules (XXs) in GaAs-based quantumwell microcavities (MCs) are studied, both theoretically and experimentally. Weshow that the radiative corrections to the XX state, the Lamb shift$\Delta^{\rm MC}_{\rm XX}$ and radiative width $\Gamma^{\rm MC}_{\rm XX}$, arelarge, about $10-30 %$ of the molecule binding energy $\epsilon_{\rm XX}$, anddefinitely cannot be neglected. The optics of excitonic molecules is dominatedby the in-plane resonant dissociation of the molecules into outgoing1$\lambda$-mode and 0$\lambda$-mode cavity polaritons. The later decay channel,``excitonic molecule $\to$ 0$\lambda$-mode polariton + 0$\lambda$-modepolariton'', deals with the short-wavelength MC polaritons invisible instandard optical experiments, i.e., refers to ``hidden'' optics ofmicrocavities. By using transient four-wave mixing and pump-probespectroscopies, we infer that the radiative width, associated with excitonicmolecules of the binding energy $\epsilon_{\rm XX} \simeq 0.9-1.1$ meV, is$\Gamma^{\rm MC}_{\rm XX} \simeq 0.2-0.3$ meV in the microcavities and$\Gamma^{\rm QW}_{\rm XX} \simeq 0.1$ meV in a reference GaAs single quantumwell (QW). We show that for our high-quality quasi-two-dimensionalnanostructures the $T_2 = 2 T_1$ limit, relevant to the XX states, holds attemperatures below 10 K, and that the bipolariton model of excitonic moleculesexplains quantitatively and self-consistently the measured XX radiative widths.We also find and characterize two critical points in the dependence of theradiative corrections against the microcavity detuning, and propose to use thecritical points for high-precision measurements of the molecule bindingenergyand microcavity Rabi splitting.Comment: 16 pages, 11 figures, accepted for publication in Phys. Rev.

Radiative corrections to the excitonic molecule state in GaAs microcavities