Journal
PHYSICAL REVIEW LETTERS
Volume 113, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.116404
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Funding
- ANR Project PLANETLAB [ANR-12-BS04-0015]
- ANR OEDYP [ANR-09-BLAN-0206-01]
- Agence Nationale de la Recherche (ANR) [ANR-12-BS04-0015, ANR-09-BLAN-0206] Funding Source: Agence Nationale de la Recherche (ANR)
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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.
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