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Ultrastrong Coupling of the Cyclotron Transition of a 2D Electron Gas to a THz Metamaterial

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Science  16 Mar 2012:
Vol. 335, Issue 6074, pp. 1323-1326
DOI: 10.1126/science.1216022

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Quantum Hall Meets Metamaterial

Controlling and tuning light-matter interaction is crucial for fundamental studies of cavity quantum electrodynamics and for applications in classical and quantum devices. Scalari et al. (p. 1323) describe a system comprising an array of metamaterial split-ring resonators and a series of two-dimensional electronic gases (2DEG) formed in GaAs quantum wells. In a magnetic field, the electrons in the 2DEG performed cyclotron orbits and formed Landau levels. Strong coupling was observed between photon and magnetic cyclotron modes, producing a tunable semiconductor system for studying the light-matter interaction of two-level systems.

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