Abstract
Stacks of intrinsic Josephson junctions (JJs) in cuprate superconductors are promising emitters of terahertz light, which is sought for many applications in imaging, spectroscopy, and communication. The authors simulate JJ stacks in three dimensions, simultaneously solving a Fickian diffusion equation for heat and coupled sine-Gordon equations for current. They predict, and confirm experimentally, that applying a modest magnetic field to a stack's long side enhances emission significantly---one more step toward efficient devices.
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