Intrinsic negative magnetoresistance from the chiral anomaly of multifold fermions

Federico Balduini (), Alan Molinari, Lorenzo Rocchino, Vicky Hasse, Claudia Felser, Marilyne Sousa, Cezar Zota, Heinz Schmid, Adolfo G. Grushin () and Bernd Gotsmann ()
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Federico Balduini: IBM Research Europe - Zurich
Alan Molinari: IBM Research Europe - Zurich
Lorenzo Rocchino: IBM Research Europe - Zurich
Vicky Hasse: Max Planck Institute for Chemical Physics of Solids
Claudia Felser: Max Planck Institute for Chemical Physics of Solids
Marilyne Sousa: IBM Research Europe - Zurich
Cezar Zota: IBM Research Europe - Zurich
Heinz Schmid: IBM Research Europe - Zurich
Adolfo G. Grushin: CNRS, Grenoble INP, Institut Néel
Bernd Gotsmann: IBM Research Europe - Zurich

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract The chiral anomaly - a hallmark of chiral spin-1/2 Weyl fermions - is an imbalance between left- and right-moving particles that underpins phenomena such as particle decay and negative longitudinal magnetoresistance in Weyl semimetals. The discovery that chiral crystals can host higher-spin generalizations of Weyl quasiparticles without high-energy counterparts, known as multifold fermions, raises the fundamental question of whether the chiral anomaly is a more general phenomenon. Answering this question requires materials with chiral quasiparticles within a sizable energy window around the Fermi level that are unaffected by extrinsic effects such as current jetting. Here, we report the chiral anomaly of multifold fermions in CoSi, which features multifold bands within ~0.85 eV of the Fermi level. By excluding current jetting through the squeezing test, we measure an intrinsic, longitudinal negative magnetoresistance. We develop a semiclassical theory to show that the negative magnetoresistance originates in the chiral anomaly, despite a sizable and detrimental orbital magnetic moment contribution. A concomitant non-linear Hall effect supports the multifold-fermion origin of the magnetotransport. Our work confirms the chiral anomaly of higher-spin generalizations of Weyl fermions, currently inaccessible outside solid-state platforms.

Date: 2024
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DOI: 10.1038/s41467-024-50451-5

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