ausblenden:
Schlagwörter:
magnetism, photogalvanic effect, spectroscopy, THz emission, topology, Cobalt alloys, Electromagnetic pulse, Gallium alloys, Interface states, Manganese alloys, Photovoltaic effects, Surface states, Terahertz spectroscopy, Ternary alloys, Femtosecond optical pulse, Generation mechanism, Nodal line, Nonlinear optical spectroscopy, Photogalvanic effects, Photon-drag effects, Terahertz emissions, Terahertz generation, Thin-films, Topological effects, Topology
Zusammenfassung:
Nonlinear optical spectroscopy is a fundamental probe for the investigation of topological effects in quantum materials. In this paper, we report on the terahertz (THz) emission from thin films at various thicknesses of the magnetic topological nodal semimetal Co2MnGa (CMG) when excited by femtosecond optical pulses. Experimental results suggest the presence of multiple THz generation mechanisms, originating from both bulk and surface states of CMG. The former is explained in terms of a photon-drag effect as induced by radiation pressure. The latter emission mechanism instead appears to be related to the photovoltaic effect coming from the topological surface states. This interplay between generation mechanisms indicates that Co2MnGa topological nodal semimetals are a valuable platform for THz emitter devices. © 2023 The Authors. Published by American Chemical Society.
