Lattice dynamics of altermagnetic ruthenium oxide RuO${}_2$

Abstract

Altermagnetic ruthenium oxide RuO${}_2$ crystallizes with P4${}_2$/mnm symmetry. Here we discuss the lattice dynamics of this structure. We show and discuss the phonon dispersion and density of states. The phonon dispersion curves contain several Dirac nodal lines and highly degenerate Dirac points. We present the characteristic frequencies and their irreducible representations at the $\Gamma$ point. Theoretically obtained frequencies of the Raman active modes nicely reproduce the ones reported experimentally.

4 pages, 3 figures

References in corpus (4)

• Altermagnetism: spin-momentum locked phase protected by non-relativistic symmetries
• Antiferromagnetism in RuO${}_2$ as $d$-wave Pomeranchuk instability
• Spin-split collinear antiferromagnets: a large-scale ab-initio study
• Coexistence of Weyl semimetal and Weyl nodal loop semimetal phases in a collinear antiferromagnet

Cited by in corpus (2)

• Constraints on magnetism and correlations in RuO${}_2$ from lattice dynamics and Mössbauer spectroscopy
• Moiré-resonant surface state in ultrathin RuO${}_2$