Abstract
Synchronization phenomena of two rectangular THz emitting mesas separately located side by side at a distance of 200μm are reported on a high-Tc superconductor Bi2Sr2CaCu2O8+δ single crystal. With varying bias current, two emission peaks observed from two mesas at frequencies around 0.7THz merge into one emission line and stay together until the emission stops by Joule heating. The frequency locking phenomenon accompanied by the increase of total radiation power suggests that a coherent operation is realized between two separate mesas.
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