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February 14, 2026Nature CommunicationsOpen Access

Spectroscopic limits of diamond anvils to 520 GPa and projected bandgap closure

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Authors

LTLoïc ToraillePLPaul LoubeyreCPC. Pépin

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Overview

Broadband absorption measurements demonstrate bandgap narrowing in diamond anvil cells, indicating metallization near 560 GPa.

Key Points

  • This research aims to define the spectroscopic limits of diamond anvils under ultrahigh pressure and explore bandgap closure.
  • Conducted broadband absorption measurements from ultraviolet to infrared wavelengths up to 520 GPa
  • Utilized Diamond Raman scattering to analyze stress profiles along the anvils' axis
  • Evaluated absorption spectra to investigate bandgap narrowing and metallization
  • Observed pronounced loss of transparency in diamond anvils with increasing pressure
  • Indicated bandgap narrowing towards the infrared and projected metallization near 560 GPa
  • Achieved refined understanding of Raman edge pressure scale across various anvil geometries

Cite This Study

Toraille et al. (2026) studied this question.

synapsesocial.com/papers/698fd276306598e8538de950https://doi.org/10.1038/s41467-026-69533-7
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