Abstract

Exposed to a strong electromagnetic field, a two-level system with broken inversion symmetry radiates at the Rabi frequency ΩR. This can be used to generate terahertz waves [Phys. Rev. Lett. 102, 023601 (2009) [CrossRef]  ]. We show that a system composed of two tunneling-coupled asymmetric two-level systems radiates at frequency (ξ1ξ2)2+ΩR2, where energies ξ1 and ξ2 characterize the tunneling interaction. This opens the possibility of tuning the terahertz spectrum in a considerable range. We also show that for particular amplitudes of the driving field, the emission at frequency (ξ1ξ2)2+ΩR2 is suppressed.

© 2016 Optical Society of America

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