Year: 2022
Type: article
Abstract: The interplay of topology with magnetism in Weyl semimetals recently arose to a vanguard topic, because of novel physical scenarios with anomalous transport properties. Here, we address the charge dynamics of the noncentrosymmetric and ferromagnetic (TC ~ 15 K) PrAlGe material and discover that it harbours electronic correlations, which are reflected in a sizeable reduction of the Fermi velocity with respect to the bare band value at low temperatures (T). At T < TC, the optical response registers a band reconstruction, which additionally causes a reshuffling of spectral weight, pertinent to the electronic environment of the type-I Weyl fermions and tracing the remarkable anomalous Hall conductivity (AHC). With the support of first-principles calculations, we provide evidence for the intimate relationship between a topological resonance of the absorption spectrum and the progressively enhanced occupation of non-trivial states with large Berry curvatures, a requirement for AHC.
Source: npj Quantum Materials
Institutions: University of Stuttgart, ETH Zurich, Laboratory for Solid State Physics, Max Planck Institute for Chemical Physics of Solids, RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences, University of Fribourg, Brookhaven National Laboratory, Stony Brook University, Chinese Academy of Sciences, South Bay Interdisciplinary Science Center, Kavli Institute for Theoretical Sciences, Institute of Physics, University of Chinese Academy of Sciences
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,440
OpenAlex ID: W4301600593