Magnetic Photocurrents in Multifold Weyl Fermions

Abstract

We examine the magneto-optical response of chiral multifold fermions. Specifically, we show that they are ideal candidates for observing the Helical Magnetic Effect (HME) previously predicted for simple Weyl fermions. Unlike Weyl fermions, the HME is present in multifold fermions even in the simplest case where the low-energy dispersion is linear and spherically symmetric. In this ideal case, we derive an analytical expression for the HME and find it is proportional to the circular photogalvanic effect; for realistic parameters and accounting for the geometry of the setup, the HME photocurrent could be roughly the same order of magnitude as the circular photogalvanic effect observed in multifold fermions. Additional non-linear and symmetry-breaking terms will ruin the quantization but not hurt the observation of the HME.

9 pages; 5 figures. Accepted Version

References in corpus (10)

• The Chiral Magnetic Effect
• Weyl semimetal phase in non-centrosymmetric transition metal monophosphides
• Berry Curvature, Triangle Anomalies, and the Chiral Magnetic Effect in Fermi Liquids
• Multiple types of topological fermions in transition metal silicides
• Large Fermi Arcs in Unconventional Weyl Semimetal RhSi
• Discovery of topological chiral crystals with helicoid arc states
• Photocurrents in Weyl semimetals
• Chiral Anomaly and Diffusive Magnetotransport in Weyl Metals
• Twofold quadruple Weyl nodes in chiral cubic crystals
• Tunable chiral symmetry breaking in symmetric Weyl materials

Cited by in corpus (6)

• Magnus Hall effect in three-dimensional topological semimetals
• Bulk-Fermi-Arc Transition Induced Large Photogalvanic Effect in Weyl Semimetals
• Multiplicative topological semimetals
• Quantum transport of a spin-1 chiral fermion
• Low-Frequency Divergence of Circular Photomagnetic Effect in Topological Semimetals
• Quantum Transport in Spin-1 Chiral Fermion: Self-Consistent Born Approximation