Hybrid excitations, called polaritons, emerge in systems with strong light–matter coupling. Usually, they dominate the linear and nonlinear optical properties with applications in quantum optics. Here, we show the crucial role of the electronic component of polaritons in the magneto-transport of a cavity-embedded two-dimensional electron gas in the ultrastrong coupling regime. We show that the linear direct-current resistivity is substantially modified by the coupling to the cavity even without external irradiation. Our observations confirm recent predictions of vacuum-induced modification of the resistivity. Furthermore, photo-assisted transport in the presence of a weak irradiation field at sub-terahertz frequencies highlights the different roles of localized and delocalized states.
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The datasets generated and analysed during the current study are available from the corresponding authors on reasonable request.
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We especially thank J. Andberger for performing many measurements confirming our results, P. Märki for valuable contributions to the measurement electronics and S. Rajabali for processing one of the transmission samples. The authors acknowledge financial support from ERC grant no. 340975 (MUSiC). The authors also acknowledge financial support from the Swiss National Science Foundation (SNF) through the National Centre of Competence in Research Quantum Science and Technology (NCCR QSIT).
The authors declare no competing interests.
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Supplementary Text, Supplementary Figs. 1–7 and Supplementary References.
Filling-factor-dependent photoresponse. Each colourmap frame corresponds to a measurement of the longitudinal photo response with the Landau level density of states aligning with the Fermi energy EF as shown on the left. The top and bottom panels of Fig. 4a represent two specific frames (in the beginning and middle of the video)
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Paravicini-Bagliani, G.L., Appugliese, F., Richter, E. et al. Magneto-transport controlled by Landau polariton states. Nature Phys 15, 186–190 (2019). https://doi.org/10.1038/s41567-018-0346-y
Communications Physics (2022)
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