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- W3199037208 abstract "Upon photoexcitation, a symmetry-broken state can undergo a nonequilibrium phase transition through different pathways from those in thermal equilibrium. Determining the mechanism underlying these photoinduced phase transitions (PIPTs) has been a long-standing issue in the study of condensed matter systems, but many details in the ultrafast, non-adiabatic regime still remain to be clarified. Here, we study the light-induced melting of a unidirectional charge density wave (CDW) in LaTe3. Using three time-resolved probes – including ultrafast electron diffraction (UED), time- and angle-resolved photoemission spectroscopy (tr-ARPES), and transient reflectivity – we independently track the amplitude and phase dynamics of the complex CDW order parameter. We find that a fast recovery of the CDW amplitude (∼1 ps) is followed by a slower reestablishment of phase coherence. This longer timescale is dictated by light-induced topological defects: long-range order is inhibited and is only restored when the defects annihilate. Our results offer a framework for understanding PIPTs by identifying the generation of defects as a governing mechanism." @default.
- W3199037208 created "2021-09-27" @default.
- W3199037208 creator A5079626142 @default.
- W3199037208 date "2021-01-01" @default.
- W3199037208 modified "2023-10-16" @default.
- W3199037208 title "Dynamics of Complex Order Parameter After Photoexcitation" @default.
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- W3199037208 doi "https://doi.org/10.1007/978-3-030-81751-0_4" @default.
- W3199037208 hasPublicationYear "2021" @default.
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