Simon Wall

20259043

Simon Wall, Naman Agarwal, Shreya Bagchi, Gabriele Bartolini et autres

Thermodynamics of the ultrafast phase transition of vanadium dioxide

Shreya Bagchi, Ernest Pastor, José Santiso, Allan S. Johnson et autres

Ultrafast photoexcitation is an emerging route to selective control of phase transitions. However, it is difficult to determine which modes govern the transformation and how effectively they are targeted by photoexcitation. This is exemplified in vanadium dioxide, which transitions from a monoclinic …

Thermodynamics of the ultrafast phase transition of vanadium dioxide

Shreya Bagchi, Ernest Pastor, José Santiso, Allan S. Johnson et autres

Ultrafast photoexcitation is an emerging route to selective control of phase transitions. However, it is difficult to determine which modes govern the transformation and how effectively they are targeted by photoexcitation. This is exemplified in vanadium dioxide, which transitions from a monoclinic …

es, dk (code pays fourni par la source)

Ultrafast surface melting of orbital order in La0.5Sr1.5MnO4

Maurizio Monti, Khalid M. Siddiqui, Daniel Pérez-Salinas, Naman Agarwal et autres

fr, dk, es, cn, gb, ch (code pays fourni par la source)

A versatile setup for symmetry-resolved ultrafast dynamics of quantum materials

Khalid M. Siddiqui, Hanna Strojecka, Thomas H. Meyland, Nitesh Khatiwada et autres

Correlated phenomena occur in quantum materials because of the delicate interplay between internal degrees of freedom, leading to multiple symmetry-broken quantum phases. Resolving the structure of these phases is a key challenge, often requiring facilities equipped with x-ray free-electron lasers and electron …

dk, fr, de, es (code pays fourni par la source)

Electron coherent phonon coupling in Pr$_{0.5}$Ca$_{1.5}$MnO$_4$ measured with ultrafast broadband spectroscopy

Emmanuel B. Amuah, Khalid M. Siddiqui, Maurizio Monti, Daniel Pérez-Salinas et autres

Photoexcitation of single-layered La$_{0.5}$Mn$_{1.5}$MnO$_4$ has played a key role in understanding orbital ordering and non-thermal states in the manganites. However, while orbital ordering in La$_{0.5}$Sr$_{1.5}$MnO$_4$ breaks the in-plane C$_4$ symmetry, many layered manganites show much more complex phase diagrams in which orbital …

Time‐Domain Raman Spectroscopy: An Emerging Technique in Space Exploration?

Y. L. Ha, S. G. Pavlov, Mihailo D. Rabasović, Aleksandar J. Krmpot et autres

ABSTRACT The potential of time‐domain Raman spectroscopy in space exploration is discussed. This work is motivated by the emergence of robust, space‐qualified femtosecond lasers and by the fact that time‐domain detection allows the design of very compact instruments. As is shown, time‐domain …

de, rs, dk (code pays fourni par la source)

Ultrafast surface melting of orbital order in La0.5Sr1.5MnO4

Maurizio Monti, Khalid M. Siddiqui, Daniel Pérez-Salinas, Naman Agarwal et autres

Understanding how light modifies long-range order in quantum materials is key to improving our ability to control functionality. However, this is challenging if the response is heterogeneous. Here we address the most common form of light-induced heterogeneity, surface melting, and measure the …

All-optical seeding of a light-induced phase transition with correlated disorder

Allan S. Johnson, Ernest Pastor, Sergi Batlle-Porro, H. Benzidi et autres

Ultrafast manipulation of vibrational coherence provides a route to control the structure of solids. However, this strategy can only induce long-range correlations and cannot modify atomic structure locally, which is a requirement for many technological applications such as non-volatile electronics. Here we …

es, fr, jp, us, kr, dk (code pays fourni par la source)

Imaging the Insulator Metal transition in Ca2RuO4 with hyperspectral coherent diffractive imaging

Naman Agarwal, Manuel Valvidares, Simon Wall, Daniel Pérez Salinas et autres

We propose to use hyperspectral coherent diffractive imaging (HCDI) to perform nanoscale spectroscopy on the temperature-induced insulator-metal transition (IMT) in Ca2RuO4, a Mott insulator that is highly susceptible to IMTs induced not only by temperature but also by strain, electric fields, and …

dk, es, it, ro (code pays fourni par la source)

High-spatial resolution coherent x-ray imaging of magnetic domains in CrI3 and Fe3GeTe2 2D ferromagnets

Jordi Llobet, Manuel Valvidares, Pierluigi Gargiani, Francesc Perez-Murano et autres

We propose to use coherent imaging with sub ~25 nm spatial resolution in few layer CrI3 and Fe3GeTe2 2D ferromagnets at Helium temperatures under different field protocols, to investigate magnetic configurations including the possible presence of chiral domains and topological magnetic states …

ro, es, dk, de (code pays fourni par la source)

Determination and correction of spectral phase from principal component analysis of coherent phonons

Emmanuel B. Amuah, Khalid M. Siddiqui, Maurizio Monti, Allan S. Johnson et autres

Measuring the spectral phase of a pulse is key for performing wavelength resolved ultrafast measurements in the few femtosecond regime. However, accurate measurements in real experimental conditions can be challenging. We show that the reflectivity change induced by coherent phonons in a …

dk, es (code pays fourni par la source)