Non-adiabatic effects and exciton-like states during insulator-to-metal transition in warm dense hydrogen
| Autor: | N. D. Orekhov, Vladimir V. Stegailov, Ilya D. Fedorov |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Physics
Condensed Matter - Materials Science Hydrogen Non-equilibrium thermodynamics chemistry.chemical_element Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences Insulator (electricity) 02 engineering and technology Conductivity 021001 nanoscience & nanotechnology 01 natural sciences Metal Temperature and pressure chemistry visual_art Latent heat Ionization 0103 physical sciences visual_art.visual_art_medium Atomic physics 010306 general physics 0210 nano-technology |
| DOI: | 10.48550/arxiv.1912.04267 |
| Popis: | Transition of molecular hydrogen to atomic ionized state with increase of temperature and pressure poses still unresolved problems for experimental methods and theory. Here we analyze the dynamics of this transition and show its nonequilibrium non-adiabatic character overlooked in both interpreting experimental data and in theoretical models. The non-adiabatic mechanism explains the strong isotopic effect [Zaghoo, Husband, and Silvera, Phys. Rev. B 98, 104102 (2018)] and the large latent heat [Houtput, Tempere, and Silvera, Phys. Rev. B 100, 134106 (2019)] reported recently. We demonstrate the possibility of formation of intermediate exciton-like molecular states at heating of molecular hydrogen that can explain puzzling experimental data on reflectivity and conductivity during the insulator-to-metal transition. Comment: 7 pages, 4 figures, Supplemental Material (10 pages) |
| Databáze: | OpenAIRE |
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