| Autor: |
B. Q. Song, X. Yang, C. Sundahl, J.-H. Kang, M. Mootz, Y. Yao, I. E. Perakis, L. Luo, C. B. Eom, J. Wang |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
|
| Zdroj: |
Ultrafast Science, Vol 3 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
2765-8791 |
| DOI: |
10.34133/ultrafastscience.0007 |
| Popis: |
We report on an ultrafast nonequilibrium phase transition with a strikingly long-lived martensitic anomaly driven by above-threshold single-cycle terahertz pulses with a peak field of more than 1 MV/cm. A nonthermal, terahertz-induced depletion of low-frequency conductivity in Nb3Sn indicates increased gap splitting of high-energy Γ12 bands by removal of their degeneracies, which induces the martensitic phase above their equilibrium transition temperature. In contrast, optical pumping leads to a Γ12 gap thermal melting. Such light-induced nonequilibrium martensitic phase exhibits a substantially enhanced critical temperature up to ∼100 K, i.e., more than twice the equilibrium temperature, and can be stabilized beyond technologically relevant, nanosecond time scales. Together with first-principle simulations, we identify a compelling terahertz tuning mechanism of structural order via Γ12 phonons to achieve the ultrafast phase transition to a metastable electronic state out of equilibrium at high temperatures far exceeding those for equilibrium states. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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