Physics – Condensed Matter – Superconductivity
Scientific paper
2010-03-22
Physics
Condensed Matter
Superconductivity
4 pages, 6 figures, RevTeX 4.0
Scientific paper
Recently THz wave emission from intrinsic Josephson junctions (IJJs) was confirmed without external magnetic fields, and the surface impedance $Z$ was found out to play a crucial role. When in-plane magnetic fields are introduced, field dependence of emission intensity also strongly depends on $Z$. For Z=1, emission becomes the strongest when the wavelength of electromagnetic wave in IJJs coincides with the distance between Josephson vortices (JVs). For $Z >- 3$, cavity resonance modes are stabilized and the fundamental mode gives the strongest emission. There occurs a dynamical phase transition between the $\pi$-phase-kink state (stable without external fields) and in-phase state as the in-plane magnetic field increases. Although the incommensurate-phase-kink state between these two states would be an artifact for small number of layers used in simulations, this artificial state almost vanishes for $Z\approx 50 \sim 60$, where field profile of emission intensity changes from a characteristic peak around 3/4 JVs per layer for smaller $Z$ to monotonic decrease for larger $Z$. This crossover induced by $Z$ may explain recent controversial experiments on the field profile of emission.
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