| Autor: |
Martí Raya-Moreno, Claudio Cazorla, Enric Canadell, Riccardo Rurali |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
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| Zdroj: |
npj 2D Materials and Applications, Vol 8, Iss 1, Pp 1-9 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
2397-7132 |
| DOI: |
10.1038/s41699-024-00501-9 |
| Popis: |
Abstract Titanium diselenide (TiSe2) is a layered material that under a critical temperature of T c ≈ 200 K features a periodic modulation of the electron density, known as charge density wave (CDW), which finds applications in quantum information and emerging electronic devices. Here, we present first-principles calculations showing the suppression of the CDW via photoexcitation and consequent stabilization of the undistorted high-temperature phase, in agreement with experimental observations. Interestingly, the unfolded CDW melting is accompanied by a sizable reduction in the thermal conductivity, κ, of up to 25% and a large entropy increase of ~10 J K−1 kg−1. The significant κ variation is almost entirely originated from photoinduced changes in the phonon–phonon scattering processes involving a high-symmetry soft phonon mode. Our results open new possibilities in the design of devices for thermal management and phonon-based logic, and suggest original applications in the of context solid-state cooling. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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