title: Time dilation of a bound half-fluxon pair in a long Josephson junction with a ferromagnetic insulator.
abstract: The fluxon dynamics in a long Josephson junction with a ferromagnetic insulating layer is investigated. It is found that the Josephson phase obeys a double sine-Gordon equation involving a bound pi fluxon solution, and the internal oscillations of the bound pair acting as a clock exhibit Lorentz reductions in their frequencies regarded as a relativistic effect in the time domain, i.e., time dilation. This is the complement to the Lorentz contraction of fluxons with no clock. A possible observation scheme is also discussed.
authors.affiliation: Graduate School of Advanced Science of Matter, Hiroshima University, Higashi-Hiroshima, 739-8530, Japan.
authors.forename: Munehiro
authors.initials: M
authors.lastname: Nishida
authors.forename: Kyoko
authors.initials: K
authors.lastname: Murata
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Fujii
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Hatakenaka