Non-Fermi liquid induced by Bose metal with protected subsystem symmetries

Abstract

Understanding non-Fermi liquids in dimensions higher than one, has been a subject of great interest. Such phases may serve as parent states for other unconventional phases of quantum matter, in a similar manner that conventional broken symmetry states can be understood as instabilities of the Fermi liquid. In this work, we investigate the emergence of a novel non-Fermi liquid in two dimensions, where the fermions with quadratic band-touching dispersion interact with the Bose metal. The bosonic excitations in the Bose metal possess an extended nodal-line spectrum in momentum space, which arises due to the subsystem symmetry or the restricted motion of bosons. Using renormalization group analysis and direct computations, we show that the extended infrared (IR) singularity of the Bose metal leads to a line of interacting fixed points of novel non-Fermi liquids, where the anomalous dimension of the fermions varies continuously, akin to the Luttinger liquid in one dimension. Further, the generalization of the model with multiple low-energy excitations is used to explore other unusual features of the resulting ground state.

Main text: 6 pages, 2 figures, Supplemental Material: 7 pages, 3 figures

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• Spin pumping effect in non-Fermi liquid metals
• Frustrated Bose ladder with extended range density-density interaction
• Current Algebra Approach to 2d Chiral Metals
• Non-Fermi Liquids from Subsystem Symmetry Breaking in van der Waals Multilayers
• Subsystem symmetries, critical Bose surface, and immobile excitations in an extended compass model