Carbon ionization at gigabar pressures: An 
<i>ab initio</i>
 perspective on astrophysical high-density plasmas

Bethkenhagen, Mandy; Witte, B. B. L.; Schörner, Maximilian; Röpke, G.; Döppner, T.; Kraus, D.; Glenzer, S. H.; Sterne, P. A.; Redmer, R.

doi:10.1103/physrevresearch.2.023260

Cited by 53 publications

(38 citation statements)

References 48 publications

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“…There are several methods to calculate Z, such as Saha model, Thomas-Fermi (TF) model 17 , density functional theory molecular dynamics (DFT-MD) 18,19 , path integral Monte Carlo (PIMC) 18 , AAHNC 20 , and Hartree-Fock-Slater (HFS) method 21 . Here, we calculate Z employing methods of TF (for Al, Fe, U and Be), HFS (for Al, Fe, U and Be), AAHNC (for Fe and Be) and Saha (for Al and Be).…”

Section: A the Average Ionizationmentioning

confidence: 99%

A random-walk shielding-potential viscosity model for warm dense metals

Cheng,

Liu,

Hou

et al. 2021

Preprint

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The collective effect on the viscosity is essential for warm dense metals. The statistics of random-walk ions and the Debye shielding effect describing the collective properties are introduced in the random-walk shieldingpotential viscosity model (RWSP-VM). As a test, the viscosities of several metals (Be, Al, Fe and U) are obtained, which cover from low-Z to high-Z elements. The results indicate that RWSP-VM is a universal accurate and highly efficient model for calculating the viscosity of metals in warm dense state.

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Section: A the Average Ionizationmentioning

confidence: 99%

A random-walk shielding-potential viscosity model for warm dense metals

Cheng,

Liu,

Hou

et al. 2021

Preprint

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“…WDM is of great importance to bridge the gap between atomic physics, condensed matter physics, and plasma physics. The equation of states, transport properties such as electrical and thermal conductivity, etc., as well as the lattice dynamics are fundamental properties of WDM, which are helpful in understanding the process of inertial confinement fusion [16][17][18] and the formation of celestial bodies [19][20][21][22]. With the development of laser technology, the nonequilibrium state of WDM has been realized by the techniques of isochoric heating using the X-ray free-electron laser (XFEL) [23][24][25][26], optical lasers [27][28][29][30][31] and ion beams [32][33][34] in experiment [35].…”

Section: Introductionmentioning

confidence: 99%

Effect of Nonequilibrium Transient Electronic Structures on Lattice Stability in Metals: Density Functional Theory Calculations

Zhang

Zeng

et al. 2022

Front. Phys.

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The electronic structures of metals undergo transient nonequilibrium states during the photoexcitation process caused by isochoric heating of X-ray free-electron laser, and their lattice stability is, thus, significantly affected. By going beyond frozen core approximation, we manually introduced nonequilibrium electron distribution function in finite-temperature density functional theory with the framework of Kohn–Sham–Mermin to investigate such transient states, and their effect on lattice stability in metals is demonstrated by phonon dispersion calculated using the finite displacement method. We found that the perfect lattice of a metal collapses due to the exotic electronic structure of nonequilibrium transient state created by isochoric heating of X-ray free-electron laser. Further increase of the number of holes created in the sample (i.e., an increase of laser fluence) still results in lattice instability for aluminum, while for copper, it results in phonon hardening. The potential energy surface is calculated for the extreme case of both Al and Cu with exactly one hole created in its inner shell for each one of the atoms. A double-well structure is clearly observed for Al, while the potential energy surface becomes steeper for Cu.

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“…The electronic structure of warm dense matter is strongly density-and temperature-dependent, seen in effects like pressure ionization as well as the relocalization of electrons with increasing temperature (caused by reduced screening of the nucleus by hot electrons). This state of matter appears in inertial fusion experiments [1][2][3], basic science experiments [4], and in astrophysical objects like white dwarf stars [5,6], giant planets [7,8], and the interior of the sun [9,10].…”

Section: Introductionmentioning

confidence: 99%

Real-Space Green's functions for Warm Dense Matter

Laraia,

Hanson,

Shaffer

et al. 2021

Preprint

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Accurate modeling of the electronic structure of warm dense matter is a challenging problem whose solution would allow a better understanding of material properties like equation of state, opacity, and conductivity, with resulting applications from astrophysics to fusion energy research.Here we explore the real-space Green's function method as a technique for solving the Kohn-Sham density functional theory equations under warm dense matter conditions. We find the method to be tractable and accurate throughout the density and temperature range of interest, in contrast to other approaches. Good agreement on equation of state is found when comparing to other methods, where they are thought to be accurate.

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Carbon ionization at gigabar pressures: An ab initio perspective on astrophysical high-density plasmas

Cited by 53 publications

References 48 publications

A random-walk shielding-potential viscosity model for warm dense metals

A random-walk shielding-potential viscosity model for warm dense metals

Effect of Nonequilibrium Transient Electronic Structures on Lattice Stability in Metals: Density Functional Theory Calculations

Real-Space Green's functions for Warm Dense Matter

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