superconductors plug ‘terahertz gap’
Ulrich Welp at Argonne National Laboratory and colleagues have discovered a simple way to synchronize the phase of these “intrinsic” Josephson junctions in high-temperature superconductors to emit milliwatts of power at frequencies up to 0.85 THz. Schematic of the terahertz-source, which was fabricated on the top of an atomically layered superconducting crystal. The applied current …