A two-band model predicts that d-wave altermagnets with Rashba coupling generate a nearly frequency-independent injection photocurrent over a wide range of photon energies.
Diverging shift current responses in the gapless limit of two-dimensional systems
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abstract
The shift current responses of two-dimensional systems in the gapless limit are investigated. As the energy gap becomes smaller, the interband transition probability becomes larger at the band edges. We found the divergence of the shift current response in a manner proportional to the inverse of the gap size when the system becomes a two-dimensional Weyl semimetal in the gapless limit. This behavior is different from that for electric polarization, which has a jump across the gapless case. It means that the quantitative relationship between electric polarizations and shift currents is broken in this gapless limit.
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Bulk photovoltaic effects in altermagnets
A two-band model predicts that d-wave altermagnets with Rashba coupling generate a nearly frequency-independent injection photocurrent over a wide range of photon energies.