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arXiv · 1701.06215

Noise of a chargeless Fermi liquid

Catalin Pascu Moca·Christophe Mora·Ireneusz Weymann·Gergely Zarand
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Abstract

We construct a Fermi liquid theory to describe transport in a superconductor-quantum dot- normal metal junction close to the singlet-doublet (parity changing) transition of the dot. Though quasiparticles do not have a definite charge in this chargeless Fermi liquid, in case of particle-hole symmetry, a mapping to the Anderson model unveils a hidden U(1) symmetry and a corresponding pseudo-charge. In contrast to other correlated Fermi-liquids, the back scattering noise reveals an effective charge equal to the charge of Cooper pairs, $e^* = 2e$. In addition,we find a strong suppression of noise when the linear conductance is unitary, even for its non-linear part.

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Catalin Pascu Moca, Christophe Mora, Ireneusz Weymann, Gergely Zarand. 2017-01-22. Noise of a chargeless Fermi liquid. https://doi.org/10.1103/physrevlett.120.016803

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