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

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

2008-10-21

arxiv.org/abs/0810.3756v2

Phys. Rev. B 80, 140506(R) (2009)

Physics

Condensed Matter

Superconductivity

4 pages, 8 figures, RevTeX

Scientific paper

10.1103/PhysRevB.80.140506

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.

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