• Letter

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

SangEun Han and Yong Baek Kim
Phys. Rev. B 106, L081106 – Published 8 August 2022
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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 an exotic non-Fermi liquid in two dimensions, where the fermions with quadratic band-touching dispersion interact with Bose metal. The bosonic excitations in 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 singularity of Bose metal leads to a line of interacting fixed points of an exotic 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.

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  • Received 26 February 2021
  • Accepted 25 July 2022

DOI:https://doi.org/10.1103/PhysRevB.106.L081106

©2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

SangEun Han and Yong Baek Kim

  • Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7

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Issue

Vol. 106, Iss. 8 — 15 August 2022

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