Nonlinear Terahertz electroluminescence from Dirac-Landau polaritons

• URL: http://arxiv.org/abs/2502.07897v2
• Date: Wed, 07 May 2025 11:27:42 GMT
• Title: Nonlinear Terahertz electroluminescence from Dirac-Landau polaritons
• Abstract summary: We report the observation of Dirac-Landau polaritons via THz magnetoreflectivity spectroscopy.<n>We demonstrate strong coupling between cyclotron transitions of two-dimensional Dirac fermions in HgTe quantum wells and optical cavity modes.<n>These findings open promising prospects for the development of Dirac-Landau polariton condensates and low-threshold, tunable terahertz polariton lasers based on cyclotron emission.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We report the observation of Dirac-Landau polaritons via THz magnetoreflectivity spectroscopy, demonstrating strong coupling between cyclotron transitions of two-dimensional Dirac fermions in HgTe quantum wells and optical cavity modes. We demonstrate efficient nonlinear electroluminescence, characterized by a strongly out-of-equilibrium polariton distribution dominated by emission from the upper polariton branches. Model calculations, based on the nonlinear dependence of the emission intensity and spectral narrowing with bias voltage, indicate a polariton occupancy per mode close to unity, with a significant contribution from stimulated polariton emission. These findings open promising prospects for the development of Dirac-Landau polariton condensates and low-threshold, tunable terahertz polariton lasers based on cyclotron emission.

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