Supercritical fluid of metal vapor plasmas, rare gases, and excitons

Хомкин, А. Л.; Шумихин, А. С.

doi:10.3367/ufne.2020.08.038825

Cited by 5 publications

(2 citation statements)

References 125 publications

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“…At the same time, it is well known (see, for example, [5,[13][14][15][16] and references therein) that, at least in the case of a weak Coulomb interaction, when the interaction parameter Γ = e 2 /aT is small (a n 4 3 is the De Broglie wavelength for electron, T and m e are the system temperature and electron mass respectively), the results of the classical consideration of the thermodynamic functions and kinetic characteristics of the CS are in a good agreement with both the experimental data and the molecular dynamic modeling (applicable with certain restrictions and additional assumptions). In this article, based on the consideration of a series of perturbation theory for a quantum CS, an explanation is given for this agreement.…”

Section: Introductionmentioning

confidence: 94%

On the problem of the classical limit for statistical characteristics of a quantum Coulomb plasma

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2023

Phys. Scr.

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The general structure of the perturbation theory series for the thermodynamic potential of asystem of electrons and point ions is discussed. In the classical limit, when Planck’s constant h tends to zero,the particular terms of the perturbation theory series diverge due to the impossibility of maintainingof stability of a purely classical system of the opposite sign charges attracted to each other. Atthe same time, it is known that in a certain range of parameters, a thermodynamic potentialthat does not contain Planck’s constant is a good approximation. Such thermodynamic functionsdescribes the experimental data well and corresponds to the molecular dynamics calculations ofmodel quasi-Coulomb systems. It is shown that the transition to a purely classical description, whichimplies the limit h → 0, is impossible, but the terms of the series containing h are small for certainplasma parameters and can be discarded. This is the rationale explanation of using classical modelsand approximations to describe plasma in certain parameter ranges. On this basis, a hypothesisis formulated about the absence of a classical limit for all measurable physical properties (including kinetic characteristics) of the Coulomb model of plasma, in which point particles interact according to the Coulomb law and, therefore, there are no adjustable parameters.

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Section: Introductionmentioning

confidence: 94%

On the problem of the classical limit for statistical characteristics of a quantum Coulomb plasma

Trigger

2023

Phys. Scr.

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“…1, b). Also note the analogy between the decrease in the thermal ionization energy of donors with their concentration in semiconductors and the decrease in the energy of " cold ionization" of metal vapors with the concentration of metal atoms, when the incipience of the c-band appears [27] (see also [28,29]).…”

Section: General Relationshipsmentioning

confidence: 99%

Maximum hopping direct current conductivity via hydrogen-like impurities in semiconductors

et al. 2022

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A quasi-classical model for calculating DC (direct current) electrical conductivity in crystalline semiconductors with hydrogen-like impurities is developed at the transition from band conduction to impurity hopping conduction with decreasing temperature. This transition from the minimum band conductivity to the maximum hopping conductivity via impurities has the form of a characteristic "kink" in the temperature dependence of the electrical resistivity. The idea of the calculation is to preliminarily determine the transition temperature Tj using the standard approach within the framework of the two-band model. The shift of the top of the v-band (the bottom of the c-band) into the depth of the band gap due to the formation of a quasi-continuous band of allowed energy values from the excited states of acceptors (donors) is taken into account. This leads to a decrease in the value of a thermal ionization energy of the majority shallow impurities due to a decrease in the maximum localization radius of a hole on an acceptor (an electron on a donor) with increasing impurity concentration. The values of the observed maximum hopping conductivity and drift hopping mobility corresponding to the temperature Tj are calculated. The numerical calculation within the framework of the proposed model is consistent with the known experimental data on the electrical conductivity and Hall coefficient of moderately compensated p-Ge crystals doped by neutron transmutation and non-intentionally compensated metallurgically doped n-Ge, as well as n- and p-Si crystals on the insulator side of the Mott insulator--metal concentration phase transition. Keywords: bulk crystals of germanium and silicon, hydrogen-like acceptors and donors, holes and electrons, band and hopping motion of charge carriers.

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Electrical conductivity of copper in the low temperature region of warm dense matter

Park,

Chi,

Lee

et al. 2024

Physics of Plasmas

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In this study, electrical conductivity of copper in the low temperature part of a warm dense matter regime is investigated utilizing underwater electrical wire explosion. Specifically, for the vapor/plasma region with a density of ∼0.01 normal density, temperature up to 10 kK, and the liquid–vapor two-phase region below the binodal curve, the electrical conductivity of copper is measured as a function of density and temperature by means of shadowgraph imaging, spectroscopy, and electrical measurements. In this region, anomalous temperature dependence and characteristics originated from a phase transition are found. Based on the careful analysis of experiments and model calculations, it is revealed that bound electrons, in addition to free electrons, contribute significantly to the electrical conductivity in the vapor/plasma region, and that the associated phase transition kinetics play a substantial role in adequately describing the behavior in the liquid–vapor two-phase region. An improved electrical conductivity model emerging from our combined experimental and theoretical study that accounts for the characteristics in the low temperature regime of the warm dense matter is presented.

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Supercritical fluid of metal vapor plasmas, rare gases, and excitons

Cited by 5 publications

References 125 publications

On the problem of the classical limit for statistical characteristics of a quantum Coulomb plasma

On the problem of the classical limit for statistical characteristics of a quantum Coulomb plasma

Maximum hopping direct current conductivity via hydrogen-like impurities in semiconductors

Electrical conductivity of copper in the low temperature region of warm dense matter

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