Metallic Hydrogen

Silvera, Isaac F.; Dias, Ranga

doi:10.37282/991819.21.44

Cited by 1 publication

(1 citation statement)

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“…The behaviour of hydrogen under conditions of extreme compression (20-400 GPa) and high temperatures (500-5000 K) has been studied for quite a long time [1][2][3][4][5] but its theoretical description still poses many unresolved questions. [6][7][8] One of these problems is the transition of compressed hydrogen in both solid and fluid states into a conducting state (metallization of solid hydrogen was predicted a long time ago).…”

Section: Introductionmentioning

confidence: 99%

Exciton Nature of Plasma Phase Transition in Warm Dense Fluid Hydrogen: ROKS Simulation**

Fedorov

Stegaĭlov

2022

ChemPhysChem

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The transition of warm dense fluid hydrogen from an insulator to a conducting state at pressures of about 20–400 GPa and temperatures of 500–5000 K has been the subject of active scientific research over the past few decades. However, various experimental and theoretical methods do not provide consistent results. In this work, we have applied the restricted open‐shell Kohn–Sham (ROKS) method for first principles molecular dynamics of dense hydrogen after thermal excitation to the first singlet excited state. The Wannier localization method has allowed us to analyze the exciton dynamics in this system. The model shows that a key mechanism of the transition is associated with the dissociation of electron‐hole pairs, which allows explaining several stages of the transition of fluid H2 from molecular state to plasma. This mechanism is able to give a quantitative description of several experimental results as well as to resolve the discrepancies between experimental studies.

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