Spin-asymmetric Josephson plasma oscillations

J. M. Kreula; G. Valtolina; P. Törmä

doi:10.1103/PhysRevA.95.013634

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Spin-asymmetric Josephson plasma oscillations

J. M. Kreula, G. Valtolina, P. Törmä

DOI 10.1103/PhysRevA.95.013634 · Physical Review A

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Abstract

The spin-asymmetric Josephson effect is a proposed quantum-coherent tunneling phenomenon where Cooper-paired fermionic spin-12 particles, which are subjected to spin-dependent potentials across a Josephson junction, undergo frequency-synchronized alternating-current Josephson oscillations with spin-dependent amplitudes. Here, in line with present-day techniques in ultracold Fermi gas setups, we consider the regime of small Josephson oscillations and show that the Josephson plasma oscillation amplitude becomes spin dependent in the presence of spin-dependent potentials, while the Josephson plasma frequency is the same for both spin components. Detecting these spin-dependent Josephson plasma oscillations provides a possible means to establish the yet-unobserved spin-asymmetric Josephson effect with ultracold Fermi gases using existing experimental tools.