Physics – Condensed Matter – Superconductivity
Scientific paper
2009-12-16
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1143/JPSJ.79.023703
The THz radiation emitted from rectangular mesas of single-crystal $\mathrm{Bi_2Sr_2CaCu_2O_{8+\delta}}$ was studied using angular distribution measurements and Fourier transform infrared spectroscopy. Unlike the recent theoretical predictions, the results provide strong evidence for a dual-source mechanism in which the uniform and non-uniform parts of the $ac$-Josephson current act as electric and magnetic current sources, respectively. The latter synchronizes with cavity modes of the mesa with integral harmonics of the fundamental radiation.
Kadowaki Kazuo
Kashiwagi Takanari
Klemm Richard A.
Minami Hidetoshi
Tachiki Masashi
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