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- W4386044274 abstract "Steady illumination of a non-centrosymmetric semiconductor results in a bulk photovoltaic current, which is contributed by real-space displacements (`shifts') of charged quasiparticles as they transit between Bloch states. The shift induced by interband excitation via absorption of photons has received the prevailing attention. However, this excitation-induced shift can be far outweighed ($ll$) by the shift induced by intraband relaxation, or by the shift induced by radiative recombination of electron-hole pairs. This outweighing ($ll$) is attributed to (i) time-reversal-symmetric, intraband Berry curvature, which results in an anomalous shift of quasiparticles as they scatter with phonons, as well as to (ii) topological singularities in the interband Berry phase (`optical vortices'), which makes the photovoltaic current extraordinarily sensitive to the linear polarization vector of the light source. Both (i-ii) potentially lead to nonlinear conductivities of order $mAV^{-2}$, without finetuning of the incident radiation frequency, band gap, or joint density of states." @default.
- W4386044274 created "2023-08-22" @default.
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- W4386044274 date "2023-08-16" @default.
- W4386044274 modified "2023-10-16" @default.
- W4386044274 title "Anomalous shift and optical vorticity in the steady photovoltaic current" @default.
- W4386044274 doi "https://doi.org/10.48550/arxiv.2308.08596" @default.
- W4386044274 hasPublicationYear "2023" @default.
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