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We show by use of energy considerations and numerical simulations the existence of a stable 2-d isoperimeter solitonic mode propagating simultaneously along the two diagonals of a square Josephson junction of intermediate length.
The zero-voltage state of a current biased Josephson tunnel junction is metastable and the system can switch to the voltage state by thermal activation. In the presence of a microwave current the rate of escape is resonantly activated when the microwave frequency matches the plasma frequency [M.H. Devoret et al. Phys. Rev. Lett. 53 (1984) 1260]. In accordance with theoretical predictions [S. Linkwitz...
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