Abstract
We pointed out a soliton can be present in a multi-band superconductor [Phys. Rev. Lett. 88 (2002) 017002]. We named it i-soliton. It connects two different coherent states having different phases. Simultaneously the time reversal symmetry breaks down. The i-soliton traps a fractional flux inside a superconducting loop. These properties may realize a fractional flux quantum device without Josephson junction in a real space. It is beyond a single flux quantum device. The i-soliton would be found in the multi-layer cuprate superconductor having crystallographically nonequivalent CuO2 planes in one unit cell of which representative is CuxBa2Ca3Cu4Oy (Cu-1234).
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