2025/02/11 by Benhamou-Bui, B., Consejo, C., Krishtopenko, S. S. +15
#FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Optics (physics.optics) #Quantum Physics (quant-ph)
paper · doi:10.48550/arxiv.2502.07897
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.