Berlin 2024 – scientific programme

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MA: Fachverband Magnetismus

MA 40: Frustrated Magnets II

MA 40.1: Talk

Thursday, March 21, 2024, 15:00–15:15, H 1058

Emergent chiral metal near a Kondo breakdown quantum phase transition — •Tom Drechsler and Matthias Vojta — Institut für Theoretische Physik and Würzburg-Dresden Cluster of Excellence ct.qmat, Technische Universität Dresden, 01062 Dresden, Germany

The destruction of the Kondo effect in a local-moment metal can lead to a topological non-Fermi-liquid phase, dubbed fractionalized Fermi liquid, with spinon-type excitations and an emergent gauge field. If the latter displays an internal π-flux structure, a chiral heavy-fermion metal naturally emerges near the Kondo-breakdown transition.

Utilizing a parton mean-field theory describing the transition between a conventional heavy Fermi liquid and a U(1) fractionalized Fermi liquid, we find a novel intermediate phase near the transition whose emergent flux pattern spontaneously breaks both translation and time-reversal symmetries. This phase is an orbital antiferromagnet, and we discuss its relevance to pertinent experiments.

Keywords: frustration; Kondo effect; (fractionalized) Fermi liquid; chiral metal