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Electronic excitations and metallization of dense solid hydrogen
- Source :
- Proceedings of the National Academy of Sciences. 110:13757-13762
- Publication Year :
- 2013
- Publisher :
- Proceedings of the National Academy of Sciences, 2013.
-
Abstract
- Theoretical calculations and an assessment of recent experimental results for dense solid hydrogen lead to a unique scenario for the metallization of hydrogen under pressure. The existence of layered structures based on graphene sheets gives rise to an electronic structure related to unique features found in graphene that are well studied in the carbon phase. The honeycombed layered structure for hydrogen at high density, first predicted in molecular calculations, produces a complex optical response. The metallization of hydrogen is very different from that originally proposed via a phase transition to a close-packed monoatomic structure, and different from simple metallization recently used to interpret recent experimental data. These different mechanisms for metallization have very different experimental signatures. We show that the shift of the main visible absorption edge does not constrain the point of band gap closure, in contrast with recent claims. This conclusion is confirmed by measured optical spectra, including spectra obtained to low photon energies in the infrared region for phases III and IV of hydrogen.
- Subjects :
- Phase transition
Multidisciplinary
Materials science
Molecular Structure
Hydrogen
Band gap
Graphene
Spectrum Analysis
Temperature
chemistry.chemical_element
Nanotechnology
Electronic structure
Molecular physics
law.invention
Models, Chemical
Absorption edge
chemistry
Metals
law
Solid hydrogen
Phase (matter)
Physical Sciences
Pressure
Electronics
Subjects
Details
- ISSN :
- 10916490 and 00278424
- Volume :
- 110
- Database :
- OpenAIRE
- Journal :
- Proceedings of the National Academy of Sciences
- Accession number :
- edsair.doi.dedup.....79e33a6f2600bd4011d9cec47966da6c
- Full Text :
- https://doi.org/10.1073/pnas.1312256110