Abstract
Exposed to a strong electromagnetic field, a two-level system with broken inversion symmetry radiates at the Rabi frequency . 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 , where energies and 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 is suppressed.
© 2016 Optical Society of America
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