Control of the electronic phase of a manganite by mode-selective vibrational excitation

Rini, Matteo; Tobey, R. I.; Dean, Nicky; Itatani, Jiro; Tomioka, Y.; Tokura, Y.; Schoenlein, R. W.; Cavalleri, Andrea

doi:10.1038/nature06119

Cited by 584 publications

(475 citation statements)

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“…Switching has also been demonstrated in these materials using femtosecond optical excitation, at near-visible [9,10,11,12,13,14,15], mid-infrared [16,17,18,19,20], or THz [21,22,23] wavelengths.…”

Section: ! !mentioning

confidence: 99%

Spatially resolved ultrafast magnetic dynamics initiated at a complex oxide heterointerface

et al. 2015

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Diffraction is used to determine the spatial and temporal evolution of the magnetic disordering. We observe a magnetic melt front that grows from the substrate interface into the film, at a speed that suggests electronically driven propagation.Light control and ultrafast phase front propagation at hetero-interfaces may lead to new opportunities in optomagnetism, for example by driving domain wall motion to transport information across suitably designed devices. 3/25! ! !In transition metal oxides, rearrangements in electronic and magnetic properties can be triggered by the application of magnetic [5] and electric fields [6], or pressure [7,8].Switching has also been demonstrated in these materials using femtosecond optical excitation, at near-visible [9,10,11,12,13,14,15], mid-infrared [16,17,18,19,20] edge. The bandwidth of the X-ray pulses was reduced to below 1 eV by a grating monochromator. Diffracted X-rays were detected as function of the time delay relative to the mid-infrared excitation pulses. An avalanche photodiode enabled pulse-to-pulse normalization of the diffracted to the incident light intensity. where the latter is limited by the jitter between the FEL and the optical laser. We compare these dynamics to the time needed for the film to become metallic, as measured by the transient reflectivity in the 1−5 THz range induced by the same mid-infrared excitation (green dots in Fig. 1(d)). These two similar timescales, which reflect only average changes over the whole film, suggest an intimate connection between the insulator-to-metal transition and the melting of magnetic order.In Figure 2, we plot the transient θ-2θ scans for the (1/4 1/4 1/4) diffraction peak, sensitive to the out-of-plane antiferromagnetic ordering. In equilibrium, i.e. at negative time delay, a narrow diffraction peak and Laue oscillations are observed, attesting to the presence of magnetic order across the entire 30-nm film height, with sharp magnetic boundaries.Figure 2 further shows that a significant peak broadening and a suppression of the Laue oscillations accompany the strong photo-induced reduction in peak intensity. The broadening of the diffraction peak implies that the excitation melts the magnetic order only over a fraction of the film along the sample growth direction. Secondly, the suppression of the Laue oscillations indicates that the boundary between the ordered and disordered regions of the film is not sharp.We also find that throughout these dynamics the in-plane correlation length, as measured by transverse rocking curves (θ scans), remains unchanged (see Supplementary 6/25! ! ! Information). Hence, the dynamics discussed here are one dimensional, evolving along the sample growth direction.!The spatial distribution of the magnetic order at a time delay τ was analyzed quantitatively with the following expression for kinematic diffractionHere, the magnetic profile is represented by the space-and time-dependent structure factor F(z,τ), where ! = 4! sin ! ! is the magnitude of the scattering wave vector (with θ th...

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Section: ! !mentioning

confidence: 99%

Spatially resolved ultrafast magnetic dynamics initiated at a complex oxide heterointerface

et al. 2015

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“…A prominent early example is light-induced metallicity of the correlated oxide Pr 0.7 Ca 0.03 MnO 3 prompted by a collapse of the bandgap via coherent excitation of Mn-O vibrational modes 112 . Resonant phonon excitation minimizes both electron and lattice heating: two detrimental effects that are difficult to avoid under non-discriminative pumping of materials with convenient near-IR or visible lasers.…”

Section: Phononic Controls Of Quantum Materialsmentioning

confidence: 99%

Towards properties on demand in quantum materials

2017

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Q uantum materials are on the ascent. This term embodies a vast portfolio of compounds and phenomena where ramifications of quantum mechanics are demonstrably real. Quantum materials are in the vanguard of contemporary physics in part because these systems afford an exceptional venue to uncover the many roles of symmetry, topology, dimensionality and strong correlations in macroscopic observables. Here we set out to explore the ways and means of creating new states of matter in quantum materials and manipulating their phases via external stimuli. Practical control of these properties is a precondition for exploiting quantum advantages in new photonic, electronic and energy technologies, a task of significant societal impact 1 . We will primarily focus on the following classes of quantum materials: transition metal oxides, Fe-and Cu-based high-T c superconductors, van der Waals semiconductors, topological insulators and Weyl semimetals, and, finally, graphene.The properties of quantum materials are anomalously sensitive to external stimuli. In these systems, interactions associated with spin, charge, lattice and orbital degrees of freedom are commonly on par with the electronic kinetic energy. A rather fragile balance between coexisting and competing ground states can be readily shifted via external stimuli, leading to a raft of quantum phases and transitions between them 2,3 . Furthermore, certain classes of driven quantum states (Fig. 1a and Box 1) are explicit products of coherent interaction between light and matter 4-6 . Alternatively, the properties of quantum materials can be pre-programmed by directly manipulating the electronic wavefunction and the attendant Berry phase that give rise to the anomalous velocity of electrons in a solid [7][8][9] . These complementary avenues of controls mean that investigations no longer need to be reduced to merely observing (in contrast, for example, to astrophysics). Instead, it is now feasible to attain, in a predictable fashion, 'properties on demand' by steering a quantum material towards a desirable ground, metastable or transient state. The past decade has witnessed an explosion in the field of quantum materials, headlined by the predictions and discoveries of novel Landau-symmetry-broken phases in correlated electron systems, topological phases in systems with strong spin-orbit coupling, and ultra-manipulable materials platforms based on two-dimensional van der Waals crystals. Discovering pathways to experimentally realize quantum phases of matter and exert control over their properties is a central goal of modern condensed-matter physics, which holds promise for a new generation of electronic/photonic devices with currently inaccessible and likely unimaginable functionalities. In this Review, we describe emerging strategies for selectively perturbing microscopic interaction parameters, which can be used to transform materials into a desired quantum state. Particular emphasis will be placed on recent successes to tailor electronic interaction parameters through th...

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“…1 Recent evidence suggests that similar phenomena can be induced dynamically, either by photoexcitation 2,3 or by mode selective vibrational excitation. 4,5 Such a behavior may lead to new strategies for the realization of all-optical high-speed switches and data storage devices. However, our understanding of the underlying ultrafast mechanisms remains incomplete and a direct comparison between the dynamically induced phase and the CMR ferromagnetic-metallic state has never been performed.…”

Section: Introductionmentioning

confidence: 99%

Transient electronic structure of the photoinduced phase ofPr0.7Ca0.3MnO3probed with soft x-ray pulses

et al. 2009

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We use time-resolved x-ray absorption near-edge structure spectroscopy to investigate the electronic dynamics associated with the photoinduced insulator-to-metal phase transition in the colossal magnetoresistive manganite Pr 0.7 Ca 0.3 MnO 3 . Absorption changes at the O K and Mn L edges directly monitor the evolution of the density of unoccupied states in the transient photoinduced phase. We show that the electronic structure of the photoinduced phase is remarkably similar to that of the ferromagnetic metallic phase reached in related manganites upon cooling below the Curie temperature.

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Control of the electronic phase of a manganite by mode-selective vibrational excitation

Cited by 584 publications

References 20 publications

Spatially resolved ultrafast magnetic dynamics initiated at a complex oxide heterointerface

Spatially resolved ultrafast magnetic dynamics initiated at a complex oxide heterointerface

Towards properties on demand in quantum materials

Transient electronic structure of the photoinduced phase ofPr0.7Ca0.3MnO3probed with soft x-ray pulses

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