在复合氧化物异质界面处激发的多个超音速相前锋
Multiple supersonic phase fronts launched at a complex-oxide hetero-interface
AI总结：
本研究利用时间分辨X射线衍射研究复合氧化物异质界面的光致相变，发现电荷再分布以超音速传播，确立了超快调控的事件层级，为光控相变器件提供新依据。
摘要：
对衬底晶格的选择性光学激发可驱动跨异质界面的相变。这一现象是异质结构中静态应变调控的非平衡类似物，有望在光控相变器件中带来新应用。本文中，我们利用时间分辨非共振与共振X射线衍射来阐明其底层物理机制，并在空间和时间维度上区分不同的微观自由度。我们测量了当LaAlO3衬底中的相干晶格畸变驱动NdNiO3发生绝缘体-金属转变时，NdNiO3的晶格动力学以及电荷歧化动力学。我们发现电荷再分布以超音速从界面传播到NdNiO3薄膜中，随后是声速晶格波。结合磁无序化以及金属-绝缘体转变的测量结果，这些结果确立了复合氧化物异质界面处超快调控的事件层级关系。
英文摘要：
Selective optical excitation of a substrate lattice can drive phase changes across hetero-interfaces. This phenomenon is a non-equilibrium analogue of static strain control in heterostructures and may lead to new applications in optically controlled phase change devices. Here, we make use of time-resolved non-resonant and resonant x-ray diffraction to clarify the underlying physics, and to separate different microscopic degrees of freedom in space and time. We measure the dynamics of the lattice and that of the charge disproportionation in NdNiO3, when an insulator-metal transition is driven by coherent lattice distortions in the LaAlO3 substrate. We find that charge redistribution propagates at supersonic speeds from the interface into the NdNiO3 film, followed by a sonic lattice wave. When combined with measurements of magnetic disordering and of the metal-insulator transition, these results establish a hierarchy of events for ultrafast control at complex oxide hetero-interfaces.
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