Theory of the pi state in 3He Josephson junctions

Details Theory of the pi state in 3He Josephson junctions Theory of the pi state in 3He Josephson junctions

1999-07-13

arxiv.org/abs/cond-mat/9907181v1

Phys. Rev. Lett. 83, 3868 (1999)

Physics

Condensed Matter

4 pages, 4 figures, http://boojum.hut.fi/research/theory/jos.html

Scientific paper

10.1103/PhysRevLett.83.3868

The flow of superfluid 3He-B through a 65 x 65 array of nanometer size apertures has been measured recently by Backhaus et al. They find in the current--phase relation a new branch, so-called pi state. We study two limiting cases which show that the pi state arises from coupling of the phase degree of freedom to the spin-orbit rotation. The pi state exists in a single large aperture, but is difficult to observe because of hysteresis. A better correspondence with experiments is obtained by assuming a thin wall, where the Josephson coupling between the two sides arises from a dense array of pin-holes.

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