Stationary phase-kink states and dynamical phase transitions controlled by surface impedance in THz wave emission from intrinsic Josephson junctions

Abstract

As possible states to characterize THz wave emission from intrinsic Josephson junctions without external fields, the McCumber-like state and $\pi$-phase-kink state have been proposed. In the present article it is numerically shown that both states are stationary according to the bias current $J$ and surface impedance $Z$. The McCumber-like state is stable for low $J$ and small $Z$. For higher $J$, the $\pi$-phase-kink state accompanied with symmetry breaking along the c axis is stable even for Z=1, though strong emission in the vicinity of cavity resonance points only takes place for larger $Z$. Different emission behaviors for Z=1 and 10 are precisely compared. The dynamical phase diagram for $1\le Z\le 10$ and the optimal value of $Z$ for the strongest emission are also evaluated.

4 pages, 8 figures, RevTeX

References in corpus (4)

• Possible Dynamic States in Inductively Coupled Intrinsic Josephson Junctions of Layered High-$T_c$ Superconductors
• Mechanism of Terahertz Electromagnetic Wave Emission from Intrinsic Josephson Junctions
• Computer Simulation on Terahertz Emission from Intrinsic Josephson Junctions of High-T_c Superconductors
• Three-Dimensional Phase-Kink State in Thick Stack of Josephson Junctions and Terahertz Radiation