Band-asymmetry-driven nonreciprocal electronic transport in a helimagnetic semimetal α-EuP_3
arxiv(2024)
Abstract
Chiral magnetic textures give rise to unconventional magnetotransport
phenomena such as the topological Hall effect and nonreciprocal electronic
transport. While the correspondence between real-space magnetic
topology/symmetry and such transport phenomena has been well established, a
microscopic understanding based on the spin-dependent band structure in
momentum space remains elusive. Here we demonstrate how a chiral magnetic
structure in real space introduces an asymmetry in the electronic band
structure and triggers a nonreciprocal electronic transport in a
centrosymmetric helimagnet α-EuP_3. The magnetic structure of
α-EuP_3 is highly tunable by a magnetic field and closely coupled to
its semi-metallic electronic band structure, enabling a systematic study across
chiral and achiral magnetic phases on the correspondence between nonreciprocal
transport and electronic band asymmetry. Our findings reveal how a microscopic
change in the magnetic configuration of charge carriers can lead to
nonreciprocal electronic transport, paving the way for designing chiral magnets
with desirable properties.
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