Intrinsic efficiency of injection photocurrents in magnetic materials
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670_1_10.0019424.pdf
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Author(s)
Campos-Hernandez, Alonso
Zhang, Yang
Grushin, Adolfo
De Juan, Fernando
Date Issued
June 1, 2022
Journal
Low Temperature Physics
Citation
Alonso J. Campos-Hernandez, Yang Zhang, Adolfo G. Grushin, Fernando de Juan; Intrinsic efficiency of injection photocurrents in magnetic materials. Low Temp. Phys. 1 June 2023; 49 (6): 670–678.
Version
Final published version
Abstract
The generation of shift and ballistic photocurrents in non-centrosymmetric materials represents a promising alternative mechanism for light energy harvesting. Many studies have focused on finding the best suited materials by maximizing the photocurrent magnitude, but estimating the actual efficiency requires knowledge of the light-induced dc photoconductivity and is rarely considered. Using the recently proposed jerk current as photoconductivity, in this work we show that only ballistic photocurrents have finite efficiency in the limit of large relaxation times τ. Moreover, at zero temperature the only ballistic current which is finite for unpolarized light is the magnetic injection current, only present in magnetic materials. We present a band structure expression for the efficiency of such photocurrent, showing that it scales as (ħΩ-E g) 2 near the band edge, and we present its frequency dependence for a simple tight-binding model. Our work provides a new tool to guide the search for efficient energy harvesting based on the magnetic injection current.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1063/10.0019424
