Nonlinear Terahertz Electroluminescence from Dirac-Landau Polaritons
Phys. Rev. Lett. 136, 096902 – Published 2 March, 2026
DOI: https://doi.org/10.1103/7rcf-fd3g
Abstract
We report Dirac–Landau polaritons observed by terahertz (THz) magnetoreflectivity spectroscopy, demonstrating strong coupling between cyclotron transitions of two-dimensional Dirac fermions in HgTe quantum wells and optical cavity modes. Under pulsed electrical injection we observe efficient nonlinear electroluminescence, with a strongly out-of-equilibrium polariton distribution dominated by emission from the upper polariton branches. Model analysis of the bias-dependent emission intensity and spectral narrowing indicates a polariton occupancy per mode approaching unity, with a possible contribution from stimulated polariton emission in the spectral region of the upper anticrossing. These results open prospects toward Dirac–Landau polariton condensates and low-threshold, tunable THz polariton lasers based on cyclotron emission.
