HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

Metallization of warm dense SiO$_2$ studied by XANES spectroscopy

Abstract : We investigate the evolution of the electronic structure of fused silica in a dense plasma regime using time-resolved x-ray absorption spectroscopy. We use a nanosecond (ns) laser beam to generate a strong uniform shock wave in the sample and a picosecond (ps) pulse to produce a broadband x-ray source near the Si $K$ edge. By varying the delay between the two laser beams and the intensity of the ns beam, we explore a large thermodynamical domain with densities varying from 1 to 5 g/cm$^3$ and temperatures up to 5 eV. In contrast to normal conditions where silica is a well-known insulator with a wide band gap of 8.9 eV, we find that shocked silica exhibits a pseudogap as a semimetal throughout this thermodynamical domain. This is in quantitative agreement with density functional theory predictions performed using the generalized gradient approximation.
Complete list of metadata

Contributor : Fabien Dorchies Connect in order to contact the contributor
Submitted on : Wednesday, January 12, 2022 - 4:45:26 PM
Last modification on : Thursday, April 7, 2022 - 1:58:21 PM
Long-term archiving on: : Wednesday, April 13, 2022 - 11:26:41 PM


Publisher files allowed on an open archive


Distributed under a Creative Commons Attribution 4.0 International License



A. Denoeud, A. Benuzzi-Mounaix, A. Ravasio, F. Dorchies, P. M. Leguay, et al.. Metallization of warm dense SiO$_2$ studied by XANES spectroscopy. Physical Review Letters, American Physical Society, 2014, 113 (11), pp.116404. ⟨10.1103/PhysRevLett.113.116404⟩. ⟨hal-01561842⟩



Record views


Files downloads