Multiple supersonic phase fronts launched at a complex-oxide hetero-interface

Först, Michael; Beyerlein, K.R.; Mankowsky, Roman; Hu, Wanzheng; Mattoni, G.; Catalano, S.; Gibert, M.; Yefanov, O.; Clark, J.N.; Frano, A.; Glownia, J.M.; Chollet, M.; Lemke, H.; Moser, B.; Collins, S.P.; Dhesi, S.S.; Caviglia, A.D.; Triscone, J.-M.; Cavalleri, Andrea

doi:10.1103/PhysRevLett.118.027401

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Multiple supersonic phase fronts launched at a complex-oxide hetero-interface

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Först, Michael
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science, 22761 Hamburg, Germany;

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Mankowsky, Roman
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science, 22761 Hamburg, Germany;

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Hu, Wanzheng
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science, 22761 Hamburg, Germany;

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Cavalleri, Andrea
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science, 22761 Hamburg, Germany;
Department of Physics, Clarendon Laboratory, University of Oxford;

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Citation

Först, M., Beyerlein, K., Mankowsky, R., Hu, W., Mattoni, G., Catalano, S., et al. (2017). Multiple supersonic phase fronts launched at a complex-oxide hetero-interface. Physical Review Letters, 118(2): 027401. doi:10.1103/PhysRevLett.118.027401.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002C-1AF3-4

Abstract

Selective optical excitation of a substrate lattice can drive phase changes across heterointerfaces. 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.