Quantum Criticality and Formation of a Singular Fermi Liquid in the Attractive SU (N>2) Anderson Model

Cǎtǎlin Paşcu Moca, Razvan Chirla, B. Dóra, G. Zaránd

Research output: Contribution to journalArticle

Abstract

While much is known about repulsive quantum impurity models, significantly less attention has been devoted to their attractive counterparts. This motivated us to study the attractive SU(N) Anderson impurity model. While for the repulsive case the phase diagram features mild N dependence and the ground state is always a Fermi liquid, in the attractive case a Kosterlitz-Thouless charge localization phase transition is revealed for N>2. Beyond a critical value of attractive interaction, an abrupt jump appears in the number of particles at the impurity site, and a singular Fermi liquid state emerges, where the scattering of quasiparticles is found to exhibit power law behavior with fractional power. The capacity diverges exponentially at the quantum critical point, signaling the Kosterlitz-Thouless transition.

Original languageEnglish
Article number136803
JournalPhysical review letters
Volume123
Issue number13
DOIs
Publication statusPublished - Sep 26 2019

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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