Kink State in a Stack of Intrinsic Josephson Junctions in Layered High-Tc Superconductors and Terahertz Radiation
Abstract
A new family of dynamic states are found in a stack of inductively coupled intrinsic Josephson junctions in the absence of an external magnetic field. In this state, (2ml+1)π phase kinks with integers ml's stack along the c axis and lock neighboring junction together. Large dc power is pumped into plasma oscillation via kinks at the cavity resonance. The plasma oscillation is uniform along the c axis with the frequency satisfying the ac Josephson relation. Thus this state supports strong terahertz radiation and seems to be compatible with the recent experimental observations.
0