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Novel Spin Dynamics in a Josephson Junction

Jian-Xin Zhu·Zohar Nussinov·Alexander Shnirman·Alexander V. Balatsky
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Abstract

We address the dynamics of a single spin embedded in the tunneling barrier between two superconductors. As a consequence of pair correlations in the superconducting state, the spin displays a rich and unusual dynamics. To properly describe the time evolution of the spin we find the generalized Wess-Zumino-Witten-Novikov term in the effective action for the spin on the Keldysh contour. The superconducting correlations lead to an effective spin action which is non-local in time leading to unconventional precessions. Our predictions might be directly tested for macroscopic spin clusters.

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Jian-Xin Zhu, Zohar Nussinov, Alexander Shnirman, Alexander V. Balatsky. 2004-01-07. Novel Spin Dynamics in a Josephson Junction. https://doi.org/10.1103/physrevlett.92.107001

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