AI Article Synopsis
- The study introduces a many-body theory for exciton-trion polaritons (ETPs) in doped 2D semiconductor materials, highlighting their nature as hybrid excitations involving excitons, trions, and photons.
- ETPs consist of two-body exciton states interacting with photons and four-body trion states influenced by Coulomb interactions, while the trions themselves are not directly coupled to the ground state.
- The research calculates the energy bands of ETPs across different doping densities, showing that band energy splittings and spectral weights are affected by Coulomb coupling, potentially allowing for new electrical and optical applications.
Article Abstract
We present a many-body theory of exciton-trion polaritons (ETPs) in doped two-dimensional semiconductor materials. ETPs are robust coherent hybrid excitations involving excitons, trions, and photons. In ETPs, the 2-body exciton states are coupled to the material ground state via exciton-photon interaction, and the 4-body trion states are coupled to the exciton states via Coulomb interaction. The trion states are not directly optically coupled to the material ground state. The energy-momentum dispersion of ETPs exhibit three bands. We calculate the energy band dispersions and the compositions of ETPs at different doping densities using Green's functions. The energy splittings between the polariton bands, as well as the spectral weights of the polariton bands, depend on the strength of the Coulomb coupling between the excitons and the trions, which in turn depends sensitively on the doping density. The doping density dependence of the ETP bands and the charged nature of the trion states could enable novel electrical and optical control of ETPs.
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| http://dx.doi.org/10.1103/PhysRevLett.126.127402 | DOI Listing |
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