Ritwika Mandal

Two pathways to break the insulating state in a correlated transition metal oxide

Joel Kuttruff, Ritwika Mandal, Marina Servol, Céline Mariette et autres

Correlated transition metal oxides present exciting prospects as switches or memory and storage devices owing to the possibility to control electronic properties using various external stimuli. While their complex behaviour is known to stem from interplay between electronic correlations, atomic structure and …

Towards photoinduced insulator-to-metal phase transition in paramagnetic Mott insulators

B. Corraze, Julio Guzman, Étienne Janod, Dorian Lagrève et autres

Global digital technology consumes ~10% of the world’s electricity. Energy efficiency could improve by moving from Von Neumann architectures to neural-network-based computing. Mottronics exploits the insulator-to-metal transition (IMT) in Mott materials for devices like memories, synapses, and neurons. Electric pulses induce the …

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Out-of-equilibrium study of ferroelectric switching in lead free perovskites with near-room temperature instabilities.

Sergio Abad Gonzalez, Matteo Levantino, Ritwika Mandal, Céline Mariette et autres

The experiment will focus on the ultrafast photo-induced dynamics in ferroelectric thin films of KTN (K(Nb1-xTax)O3 following in particular the dynamics of strain and symmetry change. We will compare textured thin film grown on 2 different substrates (R-cut sapphire and MgO) with …

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Hierarchical quasiparticle dynamics in antiferromagnets revealed by time- and momentum-resolved X-ray scattering

Arnau Romaguera, Elizabeth Skoropata, Yun Yen, B. Liu et autres

Energy flows among coupled subsystems are essential for ultrafast dynamics and high-speed technologies. In magnetic materials, spin fluctuations -- magnons -- mediate these flows in ultrafast magnetism. Yet momentum-resolved access to low-energy magnons governing the microscopic dynamics has been lacking. Using time-resolved …

Picosecond anisotropic phase separation governing photoinduced phase stability in submicron Ti3O5 crystals

Ritwika Mandal, Maciej Lorenc, Marco Cammarata, Matteo Levantino et autres

Abstract Recently developed ceramic material Ti 3 O 5 exhibits fascinating application properties, from ultrafast switching between metallic and insulating phases to light-to-heat conversion and storage. While the states conferring such properties are not spatially homogeneous, the origin of phase separation and …

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Ultrafast anisotropic phase separation governing photoinduced phase stability in submicron Ti3O5 crystals

Céline Mariette, Ritwika Mandal, Marco Cammarata, Matteo Levantino et autres

fr, ch, jp, ro (code pays fourni par la source)

Publisher Correction: Propagation of insulator-to-metal transition driven by photoinduced strain waves in a Mott material

T. Amano, Danylо Babich, Ritwika Mandal, Julio Guzman-Brambila et autres

jp, fr, se (code pays fourni par la source)

Propagation of insulator-to-metal transition driven by photoinduced strain waves in a Mott material

T. Amano, Danylо Babich, Ritwika Mandal, Julio Guzman-Brambila et autres

jp, fr, se, pl, us (code pays fourni par la source)

Phase Transformations of Individual Ti3O5 Nanocrystals Studied by In Situ Electron Microscopy

Yaowei Hu, Hilaire Mba, Matthieu Picher, Hiroko Tokoro et autres

Phase changes in individual submicron crystals of Ti 3 O 5 are studied by in situ transmission electron microscopy. An irreversible transition from the stable beta- to the metastable lambda phase is induced by slow temperature changes in thermal equilibrium or by …

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Temporal Separation between Lattice Dynamics and Electronic Spin‐State Switching in Spin‐Crossover Thin Films Evidenced by Time‐Resolved X‐Ray Diffraction

Karl Ridier, Roman Bertoni, Ritwika Mandal, Alix Volte et autres

Abstract Spin‐crossover (SCO) complexes have drawn significant attention for the possibility to photoswitch their electronic spin state on a sub‐picosecond timescale at the molecular level. However, the multi‐step mechanism of laser‐pulse‐induced switching in solid state is not yet fully understood. Here, time‐resolved …

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Time-resolved XRD study of size dependence in the photoinduced phase change in transition metal oxides

Ritwika Mandal

In recent years with the development of ultrafast and intense laser, unprecedented opportunities have emerged to modify macroscopic properties of materials in ultrafast and efficient manner. Advanced probing technique, in particular time-resolved X-ray diffraction, allows to probe the structure of photo-excited materials …

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Time-resolved XRD study of size dependence in the photoinduced phase change in transition metal oxides

Ritwika Mandal

Étude de diffraction des rayons X en temps résolu de la dépendance en taille des changements de phase photoinduits dans des oxydes de métaux de transition Ces dernières années, avec le développement du laser ultrarapide et intense, des opportunités sans précédent sont …

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