Phase transition into the metallic state in hypothetical (without molecules) dense atomic hydrogen

Хомкин, А. Л.; Шумихин, А. С.

doi:10.1134/s1063780x13100061

Cited by 22 publications

(18 citation statements)

References 12 publications

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“…This relation describes the energy (electron term) of the system of atoms as a whole. Factor α determined by Bardeen is proportional to the fraction of delocal ized electrons (see [5] for details) and describes on the whole the change in the effective mass of the electron depending on its density. Averaging expression (1) over the Fermi distribution, we obtain (in the low temper ature limit) the energy of a quasi atom in the medium: (2) where E F = (3π 2 n a ) 2/3 ប 2 /2m e is the Fermi energy.…”

Section: Collective Binding Energy (Cohesion)mentioning

confidence: 99%

“…The cohesive energy for hydrogen in atomic (hydrogen) units was calculated in our earlier works [5,8]. Let us consider a certain system of model excitons with parameters [1] c = 0.1 and κ = 10.…”

Section: Collective Binding Energy (Cohesion)mentioning

confidence: 99%

“…Earlier [5], we considered the vapor-liquid (insu lator-metal) phase transition emerging in dense atomic (hypothetical, without molecules) hydrogen. A physical model of such a transition was proposed based on the assumption concerning the decisive role of cohesive binding energy between atoms near the critical point.…”

Section: Introductionmentioning

confidence: 99%

“…Many authors noted a physical analogy between an exciton and a hydrogen atom; for this reason, we applied here our "hydrogen" approach [5] to describe the phase transition in a dense exciton gas. We consid ered a certain model exciton gas without associating it with actual semiconductor systems, assuming that our main goal is the construction of a physical model lead ing to the given phase transition and ensuring the cal culation of critical parameters.…”

Section: Introductionmentioning

confidence: 99%

“…We calculate the cohesion binding energy for the exciton gas and, using it, derive the equations of state, critical parameters, and binodal. The computational method is analogous to that used by us earlier [5] for predicting the vapor-liquid (insulator-metal) phase transition in atomic (hypothet ical, free of molecules) hydrogen and alkali metal vapors. The similarity of the methods used for hydrogen and excitons makes it possible to clarify the physical nature of the transition in the exciton gas and to predict more confidently the existence of a new phase transition in atomic hydrogen.…”

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confidence: 99%

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Physical model of the vapor-liquid (insulator-metal) transition in an exciton gas

Хомкин

Шумихин

2015

J. Exp. Theor. Phys.

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We propose a simple physical model describing the transition of an exciton gas to a conducting exciton liquid. The transition occurs due to cohesive coupling of excitons in the vicinity of the critical point, which is associated with transformation of the exciton ground state to the conduction band and the emer gence of conduction electrons. We calculate the cohesion binding energy for the exciton gas and, using it, derive the equations of state, critical parameters, and binodal. The computational method is analogous to that used by us earlier [5] for predicting the vapor-liquid (insulator-metal) phase transition in atomic (hypothet ical, free of molecules) hydrogen and alkali metal vapors. The similarity of the methods used for hydrogen and excitons makes it possible to clarify the physical nature of the transition in the exciton gas and to predict more confidently the existence of a new phase transition in atomic hydrogen.

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Section: Collective Binding Energy (Cohesion)mentioning

confidence: 99%

Section: Collective Binding Energy (Cohesion)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Physical model of the vapor-liquid (insulator-metal) transition in an exciton gas

Хомкин

Шумихин

2015

J. Exp. Theor. Phys.

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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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Plasma‐Plasma and Liquid‐Liquid First‐Order Phase Transitions

Norman

Saitov

Stegaĭlov

2014

Contrib. Plasma Phys.

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Ab initio quantum modeling is applied to check the ideas that motivated studies of both plasma phase transition (PPT) and Brazhkin semiconductor-to-metal phase transition, and to analyze both similarity and difference between them as well as with the Wigner metallization. Electron density of states and the characteristic gap in it are investigated to verify the semiconductor-to-metal nature of the transition. The change of plasma frequency is suggested to be used instead of the "degree of ionization" to characterize the difference between two plasma phases at PPT. Electron density of states, pair distribution function, and conductivity are calculated as well. It is shown that Norman-Starostin ideas about (a) PPT and (b) phase diagram for fluids are not anymore a hypothesis. They are confirmed by the experimental data.

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Phase transition into the metallic state in hypothetical (without molecules) dense atomic hydrogen

Cited by 22 publications

References 12 publications

Physical model of the vapor-liquid (insulator-metal) transition in an exciton gas

Physical model of the vapor-liquid (insulator-metal) transition in an exciton gas

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

Plasma‐Plasma and Liquid‐Liquid First‐Order Phase Transitions

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