Ground states of one and two fractional vortices in long Josephson 0-kappa junctions

Article

关键词: TEMPERATURE-DEPENDENCE;    MAGNETIC-FLUX;    JUNCTION;    SUPERCONDUCTORS;    QUANTUM;    BOUNDARIES;    INTEGER;   

DOI  :  10.1103/PhysRevB.70.174519

来源: SCIE

【 摘 要 】

Half-integer Josephson vortices in 0-pi junctions, discussed theoretically and observed experimentally, spontaneously appear at the point where the Josephson phase is pi discontinuous. The creation of arbitrary discontinuities of the Josephson phase has been demonstrated recently. Here we study fractional vortices formed at an arbitrary kappa discontinuity and discuss their stability and possible ground states. The two stable states are not mirror symmetric. Furthermore, the possible ground states formed at two kappa discontinuities separated by a distance a are investigated, and the energy and regions of stability of each ground state are calculated. We also show that the ground states may strongly depend on the distance a between the discontinuities. There is a crossover distance a(c) such that for aa(c) the ground states may be qualitatively different.

【 授权许可】

Free