THz emission from topological material and ferromagnet bilayers depends strongly on surface preparation, so thickness dependence alone cannot identify the spin-to-charge conversion mechanism, and NbP works as a broadband emitter.
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Broad-band THz emission by Spin-to-Charge Conversion in Topological Material -- Ferromagnet Heterostructures
THz emission from topological material and ferromagnet bilayers depends strongly on surface preparation, so thickness dependence alone cannot identify the spin-to-charge conversion mechanism, and NbP works as a broadband emitter.