Nonlinear Dynamics of Quantum Vortices in Long Josephson Junctions
E. M. Rudenko, I. V. Korotash, A. O. Krakovnyy, M. O. Bilogolovskyy
G. V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
Received: 17.06.2018. Download: PDF
The effectiveness of two methods for controlling the nonlinear dynamics of quantum topological vortex structures in a long Josephson junction is analysed: (a) by means of edge current injection and (b) with a stack of two long Josephson junctions. In the first case, a new, more stable and well reproducible technique for obtaining corresponding heterostructures with an additional layer of a superconducting molybdenum–rhenium alloy and a higher-quality dielectric tin-oxide layer is developed and implemented. As experimentally shown, a negative-differential-resistance region on the current– voltage characteristic arises with increasing the current injection. In the second case, the appearance of a ‘back bend’ region on a current–voltage characteristic and the transition to a resistive state with a voltage close to the gap one due to the emergence of a flux–antifluxon pair in the adjacent junction is demonstrated theoretically.
Key words: long Josephson junction, quantum vortices, nonlinear dynamics, edge current injection.
PACS: 74.25.fc, 74.25.Uv, 74.78.Fk, 74.81.Fa, 85.25.Am, 85.25.Cp
Citation: E. M. Rudenko, I. V. Korotash, A. O. Krakovnyy, and M. O. Bilogolovskyy, Nonlinear Dynamics of Quantum Vortices in Long Josephson Junctions, Metallofiz. Noveishie Tekhnol., 40, No. 10: 1273—1282 (2018) (in Ukrainian)