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  THz Generation from the Topological Nodal Line Semimetal Co2MnGa

Tomarchio, L., Mou, S., Mosesso, L., Markou, A., Lesne, E., Felser, C., et al. (2023). THz Generation from the Topological Nodal Line Semimetal Co2MnGa. ACS Applied Electronic Materials, 5(3), 1437-1443. doi:10.1021/acsaelm.2c01376.

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Tomarchio, Luca1, Author
Mou, Sen1, Author
Mosesso, Lorenzo1, Author
Markou, Anastasios2, Author           
Lesne, Edouard2, Author           
Felser, Claudia3, Author           
Lupi, Stefano1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
3Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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Free keywords: 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
 Abstract: 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.

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Language(s): eng - English
 Dates: 2023-03-082023-03-08
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1021/acsaelm.2c01376
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Title: ACS Applied Electronic Materials
  Other : ACS appl. electron. mater.
  Abbreviation : ACS AEM
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Socitey
Pages: - Volume / Issue: 5 (3) Sequence Number: - Start / End Page: 1437 - 1443 Identifier: ISSN: 2637-6113
CoNE: https://pure.mpg.de/cone/journals/resource/2637-6113