Journal
COMPTES RENDUS PHYSIQUE
Volume 22, Issue -, Pages 89-96Publisher
ACAD SCIENCES
DOI: 10.5802/crphys.47
Keywords
Exciton-polarons; Two-dimensional semiconductors; Tavis-Cummings model; Quantum optics; Many-body physics
Funding
- Swiss National Science Foundation (SNSF) [200021-178909/1]
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy [EXC-2111 -390814868]
- Swiss National Science Foundation (SNF) [200021_178909] Funding Source: Swiss National Science Foundation (SNF)
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This paper uses an analogy to the Tavis-Cummings model of quantum optics to demonstrate that an exciton-polaron can be understood as a hybrid quasiparticle, a coherent superposition of a bare exciton in an unperturbed Fermi sea and a bright collective excitation of many trions. The analogy is considered valid as long as the Chevy Ansatz provides a good description of dynamical screening of excitons and the Fermi energy is much smaller than the trion binding energy. The results are expected to provide new insights into the differences between absorption and emission spectra of two-dimensional semiconductors.
The elementary optical excitations of a two-dimensional electron or hole system have been identified as exciton-Fermi-polarons. Nevertheless, the connection between the bound state of an exciton and an electron, termed trion, and exciton-polarons is subject of ongoing debate. Here, we use an analogy to the Tavis-Cummings model of quantum optics to show that an exciton-polaron can be understood as a hybrid quasiparticle-a coherent superposition of a bare exciton in an unperturbed Fermi sea and a bright collective excitation of many trions. The analogy is valid to the extent that the Chevy Ansatz provides a good description of dynamical screening of excitons and provided the Fermi energy is much smaller than the trion binding energy. We anticipate our results to bring new insight that could help to explain the striking differences between absorption and emission spectra of two-dimensional semiconductors.
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