Emergent Topological Semimetal
arxiv(2024)
Abstract
A material's electronic topology, which is generally described via its Bloch
states and the associated bandstructure, will be enriched by the presence of
interactions. In metallic settings, the interactions are usually treated
through the concept of quasiparticles. Using the genuinely quantum critical
heavy fermion compound CeRu_4Sn_6, we investigate what happens if no
well-defined quasiparticles are present. Surprisingly, we discover a
topological semimetal phase that emerges from the material's quantum critical
state and exhibits a dome structure as a function of magnetic field and
pressure. To understand these results, we study a Weyl-Kondo semimetal model at
a Kondo destruction quantum critical point. Indeed, it exhibits features in the
spectral function that can define topological crossings beyond the
quasiparticle picture. We expect our work to stimulate the search for other
emergent topological phases.
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