Low Energy Electrodynamics of CrI3 Layered Ferromagnet
| Autor: | Stefano Lupi, Salvatore Macis, Robert J. Cava, Mariangela Cestelli Guidi, Antonio Grilli, Loi T. Nguyen, Lorenzo Mosesso, Luca Tomarchio |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Ferromagnet
Multidisciplinary Materials science Condensed matter physics Phonon Terahertz radiation Science Heterojunction Electron Ferromagnet Spectroscopy 2D materials 2D materials Paramagnetism Condensed Matter::Materials Science Ferromagnetism Phase (matter) Curie temperature Medicine Condensed Matter::Strongly Correlated Electrons Spectroscopy |
| Zdroj: | Scientific Reports, Vol 11, Iss 1, Pp 1-8 (2021) |
| Popis: | We report on the optical properties from terahertz (THz) to Near-Infrared (NIR) of the layered magnetic compound CrI3 at various temperatures, both in the para- magnetic and ferromagnetic phase. In the NIR spectral range, we have observed an insulating electronic gap around 1.1 eV which strongly hardens with decreasing temperature. The blue shift observed represents a record in insulating materials and it is a fingerprint of a strong electron-phonon interaction. Moreover, a further gap hardening is observed below the Curie temperature, indicating the establishment of an effective interaction between electrons and magnetic degrees of freedom in the ferromagnetic phase. This interaction is confirmed by the disappearance of some phonon modes in the same phase as expected from a spin-lattice interaction theory. Therefore, the optical properties of CrI3 reveal a complex interaction among electronic, phononic and magnetic degrees of freedom, opening many possibilities for its use in 2-Dimensional heterostructures. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|