One-dimensionality signature in optical conductivity of heavy-fermion CeIr$_{3}$B$_{2}$

TL;DR

This study uses ab initio calculations to reveal that CeIr₃B₂ exhibits a quasi-one-dimensional electronic structure, with flat bands and sharp optical transitions serving as signatures of its 1D heavy fermion nature.

Contribution

It demonstrates that optical conductivity peaks can serve as clear signatures of quasi-1D heavy fermion systems, based on detailed electronic structure calculations.

Findings

Flat bands within the Brillouin zone indicate quasi-1D electronic behavior.

Sharp optical transitions are observed in the optical conductivity.

Optical peaks serve as signatures of 1D heavy fermion physics.

Abstract

In low dimensions, the combined effects of interactions and quantum fluctuations can lead to dramatically new physics distinct from that existing in higher dimensions. Here, we investigate the electronic and optical properties of CeIr$_{3}$B$_{2}$, a quasi-one-dimensional (1D) Kondo lattice system, using $ab\ initio$ calculations. The Ce atoms in the hexagonal crystal structure form 1D chains along the $c$-axis, with extremely short Ce-Ce distances. The quasi-1D nature of the crystal structure is well reflected in its electronic structure. Extremely flat bands emerge within the $ab$-plane of the Brillouin zone, yielding sharp optical transitions in the corresponding optical conductivity. Our calculations indicate that these prominent peaks in the optical conductivity provide a clear signature of quasi-1D heavy fermion systems.