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  • Open Access

Dehybridization transition in multiband systems: A renormalization group approach

Mucio A. Continentino* and Edine Silva

  • *Contact author: muciocontinentino@gmail.com
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APS Open Sci. 1, 000139 – Published 16 September, 2026

DOI: https://doi.org/10.1103/b9zl-1l8n

Abstract

In strongly correlated multiband systems, such as intermetallics, heavy fermions, and Kondo insulators, electron-electron interactions lead to the damping of electronic quasiparticles at finite temperatures. This phenomenon results in an effective dehybridization between the electrons in the large conduction band and those in the narrow, correlated band. The dehybridization effect has been employed to explain the temperature dependence of several physical properties of intermetallics, heavy fermions, and actinide compounds. Recent insights from the theory of non-Hermitian systems provide a novel perspective on this problem. In this work, we adopt this viewpoint through a renormalization group (RG) approach. We derive RG equations for a one-dimensional two-band model to identify the exceptional points of this system and to characterize its topological properties. Our findings reveal that for a topological, non-Hermitian particle-hole-symmetric chain, dehybridization can be interpreted as a topological phase transition, characterized by critical exponents that we calculate. We discuss the nature of the energy scale for dehybridization in the context of the phase diagram of heavy fermions.

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APS Open Sci. 1, 000139– Published 16 September, 2026
Vol. 1
  • Received 16 March 2026
  • Revised 3 August 2026
  • Accepted 2 September 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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