2024

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

Allan S. Johnson, Ernest Pastor, Sergi Batlle-Porro, Hind Benzidi, Tetsuo Katayama, Gilberto A. de la Peña Muñoz, Viktor Krapivin, Sunam Kim, Núria López, Mariano Trigo, Simon E. Wall
Nature Physics 20, 970 (2024)

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

Emmanuel B. Amuah, Khalid Siddiqui, Maurizio Monti, Allan S. Johnson, Simon E. Wall
Optics Express 32, 3817 (2024)

Zenodo Data Repository

2023

Ultrafast lattice disordering accelerated by electronic collisional forces

Gilberto de la Peña Muñoz, Alfredo Correa, Shan Yang, Olivier Delaire, Yijing Huang, Allan Johnson, Tetsuo Katayama, Viktor Krapivin, Ernest Pastor, David Reis, Samuel Teitelbaum, Luciana Vidas, Simon Wall, Mariano Trigo
Nature Physics 19, 1489 (2023)

Ultrafast X-ray imaging of the light-induced phase transition in VO₂

A. S. Johnson, D. Perez-Salinas, K. M. Siddiqui, S. Kim, S. Choi, K. Volckaert, P. E. Majchrzak, S. Ulstrup, N. Agarwal, K. Hallman, R. F. Haglund Jr, C. M. Günther, B. Pfau, S. Eisebitt, D. Backes, F. Maccherozzi, A. Fitzpatrick, S. S. Dhesi, P. Gargiani, M. Valvidares, N. Artrith, F. de Groot, H. Choi, D. Jang, A. Katoch, S. Kwon, S. H. Park, H. Kim, S. E. Wall
Nature Physics 19, 215 (2023)

2022

Ultrafast Loss of Lattice Coherence in the Light-Induced Structural Phase Transition of V₂O₃

A. S. Johnson, D. Moreno-Mencía, E. B. Amuah, M. Menghini, J.-P. Locquet, C. Giannetti, E. Pastor, S. E. Wall
Physical Review Letters 129, 255701 (2022)

Programmable chalcogenide-based all-optical deep neural networks

Ting Yu Teo, Xiaoxuan Ma, Ernest Pastor, Hao Wang, Jonathan K. George, Joel K. W. Yang, Simon Wall, Mario Miscuglio, Robert E. Simpson and Volker J. Sorger
Nanophotonics 11 4073 (2022)

Fermionic Chern insulator from twisted light with linear polarization

Utso Bhattacharya, Swati Chaudhary, Tobias Grass, Allan S. Johnson, Simon Wall, and Maciej Lewenstein
Physical Review B 105, L081406 (2022)

Nonthermal breaking of magnetic order via photogenerated spin defects in the spin-orbit coupled insulator Sr₃Ir₂O₇

Ernest Pastor, David Moreno-Mencía, Maurizio Monti, Allan S. Johnson, Nina Fleischmann, Cuixiang Wang, Youguo Shi, Xuerong Liu, Daniel G. Mazzone, Mark P.M. Dean, Simon Wall
Physical Review B 105, 064409 (2022)

Multi-mode excitation drives disorder during the ultrafast melting of a C4-symmetry-broken phase

Daniel Perez-Salinas, Allan S. Johnson, Dharmalingam Prabhakaran, Simon Wall
Nature Communications 13 238 (2022)

2021

An achromatic pump–probe setup for broadband, few-cycle ultrafast spectroscopy in quantum materials

Emmanuel B. Amah, Allan S. Johnson, Simon E. Wall
Review of Scientific Instruments 92, 103003 (2021)

Quantitative hyperspectral coherent diffractive imaging spectroscopy of a solid-state phase transition in vanadium dioxide

Allan S Johnson, Jordi Valls Conesa, Luciana Vidas, Daniel Perez-Salinas, Christian M Günther, Bastian Pfau, Kent A Hallman, Richard F Haglund Jr, Stefan Eisebitt, Simon Wall
Science Advances 7, eabf1386 (2021)

Laser-induced transient magnons in Sr₃Ir₂O₇ throughout the Brillouin zone

Daniel G. Mazzone, Derek Meyers, Yue Cao, James G. Vale, Cameron D. Dashwood, Youguo Shi, Andrew J. A. James, Neil J. Robinson, Jiaqi Lin, Vivek Thampy, Yoshikazu Tanaka, Allan S. Johnson, Hu Miao, Ruitang Wang, Tadesse A. Assefa, Jungho Kim, Diego Casa, Roman Mankowsky, Diling Zhu, Roberto Alonso-Mori, Sanghoon Song, Hasan Yavas, Tetsuo Katayama, Makina Yabashi, Yuya Kubota, Shigeki Owada, Jian Liu, Junji Yang, Robert M. Konik, Ian K. Robinson, John P. Hill, Desmond F. McMorrow, Michael Först, Simon Wall, Xuerong Liu, and Mark P. M. Dean
PNAS 118, e2103696118 (2021)

Attosecond state-resolved carrier motion in quantum materials probed by soft x-ray XANES

Bárbara Buades, Antonio Picón, Emma Berger, Iker León, Nicola Di Palo, Seth L Cousin, Caterina Cocchi, Eric Pellegrin, Javier Herrero Martin, Samuel Mañas-Valero, Eugenio Coronado, Thomas Danz, Claudia Draxl, Mitsuharu Uemoto, Kazuhiro Yabana, Martin Schultze, Simon Wall, Michael Zürch, Jens Biegert
Applied Physics Reviews 8, 011408 (2021)

2020

Does VO₂ host a transient monoclinic metallic phase?
L. Vidas, D. Schick, E. Martínez, D. Perez-Salinas, A. Ramos-Álvarez, S. Cichy, S. Batlle-Porro, A. S. Johnson, K. A. Hallman, R. F. Haglund, Jr., and S. Wall
Physical Review X 10, 031047 (2020)

Previous Publications

Publications from ICFO

Volt-per-Ångstrom terahertz fields from X-ray free-electron lasers

T. Tanikawa, S. Karabekyan, S. Kovalev, S. Casalbuoni, V. Asgekar, S. Bonetti, S. Wall, T. Laarmann, D. Turchinovich, P. Zalden, T. Kampfrath, A. S. Fisher, N. Stojanovic, M. Gensch, G. Geloni
Journal of Synchrotron Radiation 27, 796-798 (2020)

Measurement of 10 fs pulses across the entire Visible to Near-Infrared Spectral Range

Allan S. Johnson, Emmanuel B. Amuah, Christian Brahms and Simon Wall
Scientific Reports 10, 4690 (2020)

Nanoscale phase separation and pseudogap in the hole-doped cuprates from fluctuating Cu-O-Cu bonds

Sergi Julià-Farré, Alexandre Dauphin, Ravindra W. Chhajlany, Piotr T. Grochowski, Simon Wall, Maciej Lewenstein, and Przemysław R. Grzybowski
Physical Review B 101, 125107 (2020)

Study of second and third harmonic generation from an indium tin oxide nanolayer: Influence of nonlocal effects and hot electrons

L. Rodríguez-Suné, M. Scalora, A. S. Johnson, C. Cojocaru, N. Akozbek, Z. J. Coppens, D. Perez-Salinas, S. Wall, and J. Trull
APL Photonics 5, 010801 (2020)

Probing the lattice anharmonicity of superconducting YBa₂Cu₃O_7-d via phonon harmonics

Alberto Ramos-Alvarez, Nina Fleischmann, Luciana Vidas, Alejandro Fernandez-Rodriguez, Anna Palau, and Simon Wall
Physical Review B 100, 184302 (2019)

Ultrafast evolution and transient phases of a prototype out-of-equilibrium Mott-Hubbard material

David Moreno-Mencia, Alberto Ramos-Alvarez, Luciana Vidas, Seyed M. Koohpayeh & Simon Wall
Nature Communications 10, 4034 (2019)

Ultrafast dynamics of spin and orbital correlations in quantum materials: an energy- and momentum-resolved perspective

Y. Cao , D. G. Mazzone , D. Meyers , J. P. Hill , X. Liu , S. Wall and M. P. M. Dean
Philosophical Transactions of the Royal Society A 377, 20170480 (2019)

Ultrafast disordering of vanadium dimers in photoexcited VO₂

S. Wall, S. Yang, L. Vidas, M. Chollet, J. M. Glownia, M. Kozina, T. Katayama, T. Henighan, M. Jiang, T. A. Miller, D. A. Reis, L. A. Boatner, O. Delaire, M. Trigo
Science 362, 572-576 (2018)
Snapshots of a phase transition - Science summary
Disorder at the border - Perspective by Prof. A. Cavalleri
ICFO press release
SLAC press release

Imaging Nanometer Phase Coexistence at Defects During the Insulator-Metal Phase Transformation in VO₂ Thin Films by Resonant Soft X-Ray Holography

L. Vidas, C. M. Günther, T. A. Miller, B. Pfau, D. Perez-Salinas, E. Martinez, M. Schneider, E. Guehrs, P. Gargiani, M. Valvidares, R. E. Marvel, K. A. Hallman, R. F. Haglund Jr, S. Eisebitt, S. Wall
Nano Letters 18 3449 (2018)

Ultrafast energy- and momentum-resolved dynamics of magnetic correlations in the photo-doped Mott insulator Sr₂IrO₄

M. P. M. Dean, Y. Cao, X. Liu, S. Wall, D. Zhu, R. Mankowsky, V. Thampy, X. M. Chen, J. G. Vale, D. Casa, J. Kim, A. H. Said, P. Juhas, R. Alonso-Mori, J. M. Glownia, A. Robert, J. Robinson, M. Sikorski, S. Song, M. Kozina, H. Lemke, L. Patthey, S. Owada, T. Katayama, M. Yabashi, Y. Tanaka, T. Togashi, J. Liu, C. Rayan Serrao, B. J. Kim, L. Huber, C.-L. Chang, D. F. McMorrow, M. Först and J. P. Hill
Nature Materials 15, 601-605 (2016)
News and views by Carbone
ICFO press release

Light control of orbital domains: case of the prototypical manganite La_0.5Sr_1.5MnO₄

T. Miller, M. Gensch, S. Wall
Physica Scripta 91, 124002 (2016)

Recent Developments in Ultrafast X-ray Techniques for Materials Science Applications

S. Wall and M. Trigo
Synchrotron Radiation News 29 13-18 (2016)

Resonant optical control of the structural distortions that drive ultrafast demagnetization in Cr₂O₃

V. G. Sala, S. Dal Conte, T. A. Miller, D. Viola, E. Luppi, V. Véniard, G. Cerullo, and S. Wall
Physical Review B 94, 014430 (2016)

Ultrafast optical response of the amorphous and crystalline states of the phase change material Ge₂Sb₂Te₅

T. A. Miller, M. Rudé, V. Pruneri, and S. Wall
Physical Review B 94, 024301 (2016)

Strain-engineered diffusive atomic switching in two-dimensional crystals

J. Kalikka, X. Zhou, E. Dilcher, S. Wall, J. Li and R. E. Simpson
Nature Communications 7, 119838 (2016)

Ultrafast and Broadband Tuning of Resonant Optical Nanostructures Using Phase-Change Materials

Miquel Rudé, Vahagn Mkhitaryan, Arif E. Cetin, Timothy A. Miller, Albert Carrilero, Simon Wall, F. Javier García de Abajo, Hatice Altug and Valerio Pruneri
Advanced Optical Materials 4 1060 (2016)

High-Field High-Repetition-Rate Sources for the Coherent THz Control of Matter

B. Green et al.
Scientific Reports 6 22256 (2016)

Sub-nanometre resolution of atomic motion during electronic excitation in phase-change materials

K. V. Mitrofanov, P. Fons, K. Makino, R. Terashima, T. Shimada, A. V. Kolobov, J. Tominaga, V. Bragaglia, A. Giussani, R. Calarco, H. Riechert, T. Sato, T. Katayama, K. Ogawa, T. Togashi, M. Yabashi, S. Wall, D. Brewe and M. Hase
Scientific Reports 6, 20633 (2016)

THz Field Control of In-Plane Orbital Order in La_0.5Sr_1.5MnO₄

Timothy A. Miller, Ravindra W. Chhajlany, Luca Tagliacozzo, Bertram Green, Sergey Kovalev, Dharmalingam Prabhakaran, Maciej Lewenstein, Michael Gensch, Simon Wall
Nature Communications 6 8175 (2015)

Time-domain separation of optical properties from structural transitions in resonantly bonded materials

Lutz Waldecker, Timothy A. Miller, Miquel Rude, Roman Bertoni, Johann Osmond, Valerio Pruneri, Robert Simpson, Ralph Ernstorfer, Simon Wall
Nature Materials 14 991 (2015)

Witnessing the formation and relaxation of massive quasi-particles in a strongly correlated electron system

F. Novelli, G. De Filippis, V. Cataudella, M. Esposito, I. V. Kausel, F. Cilento, E. Sindici, A. Amaricci, C. Giannetti, D. Prabhakaran, S. Wall, A. Perucchi, S. Dal Conte, G. Cerullo, M. Capone, A. Mishchenko, M. Grüninger, N. Nagaosa, F. Parmigiani, D. Fausti
Nature Communications 5 5112 (2014)

Tracking the evolution of electronic and structural properties of VO₂ during the ultrafast photoinduced insulator-metal transition

S. Wall, L. Foglia, D. Wegkamp, K. Appavoo, J. Nag, R.F. Haglund Jr, J. Stähler, M. Wolf
Physical Review B 87, 115126 (2013)

Publications from the Fritz Haber Institute

Evolution of three-dimensional correlations during the photo-induced melting of antiferromagnetic order in La_0.5Sr_1.5MnO₄

R. I Tobey, S. Wall, M Först, H. Bromberger, V. Khanna, J.J. Turner, W. F. Schlotter, M. Trigo, O. Kurpin, W. S. Lee, Y.-D. Chaung, R. Moore, A.L.Cavalieri, S. B. Wilkins, H. Zheng, J. F. Mitchell, S. S. Dhesi, A. Cavalleri, J P. Hill
Physical Review B 86, 064425 (2012)

Ultrafast changes in lattice symmetry probed by coherent phonons

S. Wall, D. Wegkamp, L. Foglia, K. Appavoo, J. Nag, R.F. Haglund Jr., J. Stähler, M. Wolf
Nature Communications 3 721 (2012)

Driving magnetic order in a manganite by ultrafast lattice excitation

M. F örst, R.I. Tobey, S. Wall, H. Bromberger, V. Khanna, A.L. Cavalieri, Y.-D. Chuang, W.S. Lee, R. Moore, W.F. Schlotter, J.J. Turner, O. Krupin, M. Trigo, H. Zheng, J.F. Mitchell, S.S. Dhesi, J.P. Hill, A. Cavalleri
Physical Review B (Rapid Communications) 84 241104(R) (2011)

Phase retrieval and compression of low-power white-light pulses

D. Wegkamp, D. Brida, S. Bonora, G. Cerullo, J. Stähler, M. Wolf and S. Wall
Applied Physics Letters 99, 101101 (2011)

Melting of Antiferromagnetic Order in La_0.5Sr_1.5MnO₄ Probed using Ultrafast Resonant Soft X-ray Diffraction

H. Ehrke, R. I. Tobey, S. Wall, S. A. Cavill, M. Forst, V. Khanna, Th. Garl, N. Stojanovic, D. Prabhakaran, A. T. Boothroyd, M. Gensch, A. Mirone, P. Reutler, A. Revcolevschi, S. S. Dhesi and A. Cavalleri
Physical Review Letters 106, 217401 (2011)

Advances in Ultrafast Control and Probing of Correlated-Electron Materials

S. Wall, M. Rini, S. S. Dhesi, R. W. Schoenlein, A Cavalleri
IEEE Journal of Selected Topics in Quantum Electronics: Ultrafast Science and Technology 18 81-91 (2011)

Publications from the University of Oxford

Quantum interference between charge excitation paths in a solid state Mott insulator

S. Wall, D. Brida, S. R. Clark, H.P. Ehrke, D. Jaksch, A. Ardavan, S. Bonora, H. Uemura, Y. Takahashi, T. Hasegawa, H. Okamoto, G. Cerullo, A. Cavalleri
Nature Physics 7, 114 (2011)

Transient electronic structure of the photoinduced phase of Pr_0.7Ca_0.3MnO₃ probed with soft x-ray pulses

M. Rini, Y. Zhu, S. Wall, R. I. Tobey, H. Ehrke, T. Garl, J. W. Freeland, Y. Tomioka, Y. Tokura, A. Cavalleri, and R. W. Schoenlein
Physical Review B 80 155113 (2009)

Ultrafast coupling between light, coherent lattice vibrations, and the magnetic structure of semicovalent LaMnO₃

S. Wall, D. Prabhakaran, A.T. Boothroyd, A. Cavalleri
Physical Review Letters 103 097402 (2009)

Optical switching in VO₂ films by below-gap excitation

M. Rini, Z. Hao Z, R.W. Schoenlein, C. Giannetti, F. Parmigiani, S. Fourmaux, J.C Kieffer, A. Fujimori, M. Onoda, S. Wall, A. Cavalleri
Applied Physics Letters 92 181904 (2008)

Coherent orbital waves in the photo-induced insulator-metal dynamics of a magnetoresistive manganite

D. Polli, M. Rini, S. Wall, R.W Schoenlein, Y. Tomioka, Y. Tokura, G. Cerullo, A. Cavalleri
Nature Materials 6 643 (2007)

Tracking the motion of charges in a terahertz light field by femtosecond X-ray diffraction

A. Cavalleri, S. Wall, C. Simpson, E. Statz, D.W. Ward, K.A. Nelson, M. Rini, R. W. Schoenlein
Nature 442 664 (2006)

Publications