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Tomarchio L, Macis S, Mou S, Mosesso L, Markou A, Lesne E, Felser C, Lupi S. Optical Conductivity and Photo-Induced Polaronic Formation in Co 2MnGa Topological Semimetal. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024:e2400247. [PMID: 39252449 DOI: 10.1002/advs.202400247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Revised: 05/17/2024] [Indexed: 09/11/2024]
Abstract
Topological materials occupy an important place in the quantum materials family due to their peculiar low-energy electrodynamics, hosting emergent magneto-electrical, and nonlinear optical responses. This manuscript reports on the optical responses for the magnetic topological nodal semimetal Co2MnGa, studied in a thin film geometry at various thicknesses. The thickness-dependent optical conductivity is investigated, observing a substantial dependence of the electronic band structure on thickness. Additionally, details on the ultrafast response of the low energy excitations in the terahertz frequency are reported by employing optical pump-terahertz probe (OPTP) spectroscopy. In particular, the photocarrier dynamics of Co2MnGa thin films is studied at varying pump fluence, pump wavelength, and film thickness, observing a negative THz photoconductivity which is assigned to a dynamical formation of large polarons in the material.
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Affiliation(s)
- Luca Tomarchio
- Department of Physics, Sapienza University, Piazzale Aldo Moro 5, 00185, Rome, Italy
- INFN section of Rome, P.Le Aldo Moro, 2, 00185, Rome, Italy
| | - Salvatore Macis
- Department of Physics, Sapienza University, Piazzale Aldo Moro 5, 00185, Rome, Italy
| | - Sen Mou
- INFN section of Rome, P.Le Aldo Moro, 2, 00185, Rome, Italy
| | - Lorenzo Mosesso
- Department of Physics, Sapienza University, Piazzale Aldo Moro 5, 00185, Rome, Italy
| | | | - Edouard Lesne
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187, Dresden, Germany
| | - Claudia Felser
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187, Dresden, Germany
| | - Stefano Lupi
- Department of Physics, Sapienza University, Piazzale Aldo Moro 5, 00185, Rome, Italy
- INFN section of Rome, P.Le Aldo Moro, 2, 00185, Rome, Italy
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