Stationary phase-kink states and dynamical phase transitions controlled by surface impedance in terahertz wave emission from intrinsic Josephson junctions
Stationary phase-kink states and dynamical phase transitions controlled by surface impedance in terahertz wave emission from intrinsic Josephson junctions
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DOI：
10.1103/physrevb.80.140506
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发表时间：
2008-10
影响因子：
3.7
通讯作者：
Y. Nonomura
中科院分区：
文献类型：
--
作者：
Y. Nonomura
作为表征本征Josephson结在无外场条件下THz波发射的可能态，McCumber-like态和$\ensuremath{\pi}$-phase-kink态被提出.在目前的快速通信中，它的数值表明，这两个国家是固定的根据偏置电流$J$和表面阻抗$Z$。McCumber-like态在低J$和小Z$时是稳定的。对于更高的$J$，$\ensuremath{\pi}$-相位扭结状态伴随着对称性破缺沿着$c$轴是稳定的，即使$Z=1$，但强发射附近的腔共振点只发生了较大的$Z$。精确地比较了$Z=1$和10的不同发射行为。还评估了$1\ensuremath{\le}Z\ensuremath{\le}10$的动态相图以及最强发射的$Z$最佳值。
As possible states to characterize THz wave emission from intrinsic Josephson junctions without external fields, the McCumber-like state and $\ensuremath{\pi}$-phase-kink state have been proposed. In the present Rapid Communication 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 $\ensuremath{\pi}$-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 $1\ensuremath{\le}Z\ensuremath{\le}10$ and the optimal value of $Z$ for the strongest emission are also evaluated.