Noise of a Chargeless Fermi Liquid

Cǎtǎlin Paşcu Moca, Christophe Mora, Ireneusz Weymann, G. Zaránd

Research output: Contribution to journalArticle

1 Citation (Scopus)


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 the case of particle-hole symmetry, a mapping to the Anderson model unveils a hidden U(1) symmetry and a corresponding pseudocharge. 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 nonlinear part.

Original languageEnglish
Article number016803
JournalPhysical Review Letters
Issue number1
Publication statusPublished - Jan 5 2018

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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