Physics – Condensed Matter – Superconductivity
Scientific paper
2008-03-31
Phys. Rev. Lett. 100, 247006 (2008)
Physics
Condensed Matter
Superconductivity
4 pages, 5 figures; to appear in Phys. Rev. Lett.;
Scientific paper
10.1103/PhysRevLett.100.247006
Based on computer simulations and theoretical analysis, a new dynamic state is found in inductively coupled intrinsic Josephson junctions in the absence of an external magnetic field. In this state, the plasma oscillation is uniform along the c axis and there are $(2m+1)\pi$ phase kinks, with $m$ being an integer, periodic and thus non-uniform in the $c$ direction. In the IV characteristics, the state manifests itself as current steps occurring at all cavity modes. Inside the current steps, the plasma oscillation becomes strong, which generates several harmonics in frequency spectra at a given voltage. The recent experiments on terahertz radiations from the mesa of a BSCCO single crystal can be explained in terms of this state.
Hu Xiao
Lin Shizeng
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