In Nb3X8 flat-band Mott insulators, the main shift-current peaks arise entirely from a momentum-space displacement, not from real-space electron motion.
Hosur, Circular photogalvanic effect on topological insulator surfaces: Berry-curvature-dependent response, Phys
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Pure momentum-shift bulk photovoltaic effect in ferroelectric flat-band Mott insulators
In Nb3X8 flat-band Mott insulators, the main shift-current peaks arise entirely from a momentum-space displacement, not from real-space electron motion.