Oxford Centre for High Energy Density Science (OxCHEDS): publications

Development of a new quantum trajectory molecular dynamics framework

(2022)

Authors:

Pontus Svensson, Thomas Campbell, Frank Graziani, Zhandos Moldabekov, Ningyi Lyu, Victor S Batista, Scott Richardson, Sam M Vinko, Gianluca Gregori

EMP from LWFA with Two Collinear, Time-Separated Laser Beams

Institute of Electrical and Electronics Engineers (IEEE) 00 (2022) 1-4

Authors:

Joshua Latham, Marko W Mayr, Yong Ma, Paul T Campbell, Qian Qian, Andre F Antoine, Mario Balcazar, Jason Cardarelli, Rebecca Fitzgarrald, Andrew McKelvey, Galina Kalinchenko, Bixue Hou, Anatoly M Maksimchuk, John Nees, Alexander GR Thomas, Peter A Norreys, Karl M Krushelnick

Searching for Wave-like Dark Matter with QSHS

(2022)

Authors:

I Bailey, B Chakraborty, G Chapman, Ej Daw, J Gallop, G Gregori, E Hardy, L Hao, E Laird, P Leek, S.Ó.Peatáin, Y Pashkin, Mg Perry, M Piscitelli, E Romans, J March-Russell, P Meeson, S Sarkar, Pj Smith, N Song, M Soni, Bk Tan, S West, S Withington

UN'INEDITA STATUA DELLA VIRTVS CORP. COLL. DENDROPHORVM DA CAREIAE (SANTA MARIA DI GALERIA)

Papers of the British School at Rome Cambridge University Press (CUP) 90 (2022) 35-61

Authors:

Marco Brunetti, Simone Ciambelli, Gian Luca Gregori

Atomistic deformation mechanism of silicon under laser-driven shock compression

Nature Communications Springer Nature 13 (2022) 5535

Authors:

Silvia Pandolfi, S Brennan Brown, Paul Stubley, Justin Wark

Abstract:

Silicon (Si) is one of the most abundant elements on Earth, and it is the most widely used semiconductor. Despite extensive study, some properties of Si, such as its behaviour under dynamic compression, remain elusive. A detailed understanding of Si deformation is crucial for various fields, ranging from planetary science to materials design. Simulations suggest that in Si the shear stress generated during shock compression is released via a high-pressure phase transition, challenging the classical picture of relaxation via defect-mediated plasticity. However, direct evidence supporting either deformation mechanism remains elusive. Here, we use sub-picosecond, highly-monochromatic x-ray diffraction to study (100)-oriented single-crystal Si under laser-driven shock compression. We provide the first unambiguous, time-resolved picture of Si deformation at ultra-high strain rates, demonstrating the predicted shear release via phase transition. Our results resolve the longstanding controversy on silicon deformation and provide direct proof of strain rate-dependent deformation mechanisms in a non-metallic system.

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