Magnetic photocurrents in multifold Weyl fermions

Kaushik, Sahal; Cano, Jennifer

doi:10.1103/physrevb.104.155149

Title: Magnetic photocurrents in multifold Weyl fermions

Journal Article · Wed Oct 27 00:00:00 EDT 2021 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.104.155149· OSTI ID:1846667

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^[2]

Stony Brook Univ., NY (United States)
Stony Brook Univ., NY (United States); Flatiron Institute, New York, NY (United States)

Here, 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 nonlinear and symmetry-breaking terms will ruin the quantization but not hurt the observation of the HME.

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Research Organization:: Stony Brook Univ., NY (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0017662

OSTI ID:: 1846667

Journal Information:: Physical Review. B, Vol. 104, Issue 15; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Magnetic photocurrents in multifold Weyl fermions

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