Exciton Polariton-Polariton Interactions in Transition-Metal Dichalcogenides
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| Main Authors: | , , , |
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| Format: | Preprint |
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2026
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| author | König, Jonas K Fitzgerald, Jamie M Erkensten, Daniel Malic, Ermin |
| author_facet | König, Jonas K Fitzgerald, Jamie M Erkensten, Daniel Malic, Ermin |
| contents | Microscopic insights into nonlinear interactions are essential for advancing polaritonic devices. Existing studies often rely on phenomenological models that overlook important many-body processes. Based on a material-specific and predictive approach, we investigate monolayer and homobilayer MoS$_2$ embedded in a Fabry-Pérot cavity to characterize the exchange, saturation, and dipole-dipole contributions to polariton-polariton interactions in these technologically promising materials. A key finding is that the exchange interaction induces asymmetric energy shifts of the lower and upper polariton branches in a detuned cavity, a behavior driven by the difference in their excitonic character. Furthermore, we demonstrate that temperature and electron-photon coupling determine the energy renormalization through the equilibrium polariton distribution. In homobilayers, the dipole-dipole interaction is mediated by the interlayer character, enabling electrical control and facilitating the electric-field-induced closing of anti-crossings due to dipolar-interaction shifts. The gained insights on polariton-polariton interactions are important for the development of ultra-compact polaritonic circuitry. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2603_28409 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Exciton Polariton-Polariton Interactions in Transition-Metal Dichalcogenides König, Jonas K Fitzgerald, Jamie M Erkensten, Daniel Malic, Ermin Mesoscale and Nanoscale Physics Microscopic insights into nonlinear interactions are essential for advancing polaritonic devices. Existing studies often rely on phenomenological models that overlook important many-body processes. Based on a material-specific and predictive approach, we investigate monolayer and homobilayer MoS$_2$ embedded in a Fabry-Pérot cavity to characterize the exchange, saturation, and dipole-dipole contributions to polariton-polariton interactions in these technologically promising materials. A key finding is that the exchange interaction induces asymmetric energy shifts of the lower and upper polariton branches in a detuned cavity, a behavior driven by the difference in their excitonic character. Furthermore, we demonstrate that temperature and electron-photon coupling determine the energy renormalization through the equilibrium polariton distribution. In homobilayers, the dipole-dipole interaction is mediated by the interlayer character, enabling electrical control and facilitating the electric-field-induced closing of anti-crossings due to dipolar-interaction shifts. The gained insights on polariton-polariton interactions are important for the development of ultra-compact polaritonic circuitry. |
| title | Exciton Polariton-Polariton Interactions in Transition-Metal Dichalcogenides |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2603.28409 |