| 4 | Ultrafast Martensitic Phase Transition Driven by Intense Terahertz Pulses显示文摘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 Nb_(3)Sn indicates increased gap splitting of high-energy Г_(12) bands by removal of their degeneracies,which induces the martensitic phase above their equilibrium transition temperature.In contrast,optical pumping leads to a Г_(12) 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 Г_(12) phonons to achieve the ultrafast phase transition to a metastable electronic state out of equilibrium at high temperatures far exceeding those for equilibrium states. | B.Q.Song X.Yang C.Sundahi J-H.Kang M.Mootz Y.Yao I.E.Perakis L.Luo C.B.Eom J.Wang | 2023 | Ultrafast Science2023，3，1： | 0 |
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