Bulk photovoltaic effects in altermagnets

Abstract

The bulk photovoltaic effect is a photocurrent generation from alternating electric field, which is a promising candidate for future efficient solar cell technology. It is the second-order optical current, which is the injection current or the shift current. We focus on the direct current generation. By employing a simple two-band model of the $d$-wave altermagnet coupled with the Rashba interaction, we show that the linearly polarized light can generate the injection and shift currents when the Néel vector points to an in-plane direction. The magnitude of the injection current is almost constant over a wide range of the frequency $\omega$ of the applied light provided it is smaller than a certain critical frequency ${\omega }_{\text{c}}$ and larger than the bulk gap energy ${\epsilon }_{\text{gap}}$, ${\epsilon }_{\text{gap}}<\hslash \omega <\hslash {\omega }_{\text{c}}$. Hence, the use of the injection current is quite efficient for solar cell technology because any photon whose energy is within this range can be equally utilized.

arXiv comment7 pages, 5 figures

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• Quantum geometry and $X$-wave magnets with $X=p,d,f,g,i$
• Almost half-quantized planar Hall effects in $X$-wave magnets with $X=p,d,f,g,i$
• Quantization of spin circular photogalvanic effect in altermagnetic Weyl semimetals
• Tunneling magnetoresistance in a junction made of $X$-wave magnets with $X=p,d,f,g,i$
• Cartesian Nodal Lines and Magnetic Kramers Weyl Nodes in Spin-Split Antiferromagnets
• Nonlinear opto-magnetic signature of d-wave altermagnets