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Title: Switchable magnetic bulk photovoltaic effect in the two-dimensional magnet CrI3
Authors: Zhang, Y.Holder, T.Ishizuka, Juan, F.Nagaosa, N.Felser, C.Yan, B.
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Issue Date: 2019
Published in: Nature Communications Vol. 10 (2019), No. 1
Publisher: London : Nature Publishing Group
Abstract: The bulk photovoltaic effect (BPVE) rectifies light into the dc current in a single-phase material and attracts the interest to design high-efficiency solar cells beyond the pn junction paradigm. Because it is a hot electron effect, the BPVE surpasses the thermodynamic Shockley–Queisser limit to generate above-band-gap photovoltage. While the guiding principle for BPVE materials is to break the crystal centrosymmetry, here we propose a magnetic photogalvanic effect (MPGE) that introduces the magnetism as a key ingredient and induces a giant BPVE. The MPGE emerges from the magnetism-induced asymmetry of the carrier velocity in the band structure. We demonstrate the MPGE in a layered magnetic insulator CrI3, with much larger photoconductivity than any previously reported results. The photocurrent can be reversed and switched by controllable magnetic transitions. Our work paves a pathway to search for magnetic photovoltaic materials and to design switchable devices combining magnetic, electronic, and optical functionalities.
Keywords: chromium derivative; chromium triioide; unclassified drug; asymmetry; design; electrical conductivity; energy efficiency; fuel cell; photovoltaic system; thermodynamics; Article; bulk photovoltaic effect; electron; energy conversion; human; magnetic field; magnetism; magnetotherapy; photodynamics; polarization; refraction index; relaxation time
DDC: 530
License: CC BY 4.0 Unported
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