Electrical Conductivity of Noble Gas Plasmas in the Warm Dense Matter Regime

2012 ◽  
Vol 52 (4) ◽  
pp. 251-260 ◽  
Author(s):  
Z.J. Fu ◽  
Q.F. Chen ◽  
X.R. Chen
Keyword(s):  
Electrical Conductivity ◽  
Noble Gas ◽  
Dense Matter ◽  
Warm Dense Matter

scholarly journals Transport properties of warm dense matter behind intense shock waves

2014 ◽  
Vol 33 (1) ◽  
pp. 41-50 ◽  
Author(s):  
V. B. Mintsev ◽  
V. E. Fortov
Keyword(s):  
Experimental Data ◽  
Electrical Conductivity ◽  
Transport Properties ◽  
Shock Compression ◽  
Shear Viscosity ◽  
Dense Matter ◽  
Warm Dense Matter ◽  
Strongly Coupled ◽  
Intense Shock ◽  
Strongly Coupled Plasma

AbstractThis report presents the overview of the results of investigation of transport properties of warm dense matter in the conditions with strong coupling generated as a result of the shock or multiple shock compression of substance up to the megabar pressure range. We consider the results of measurements of the electrical conductivity in two different regions. The first one is the high temperature region, where the temperatures are of the order or much higher than the ionization potential I of the compressed substance. The region of “pressure ionization” where T ≪ I is the most interesting from the point of view of the specific plasma phase transitions. A few amounts of experimental data on shock compressed matter viscosity are discussed. For the estimations of shear viscosity of strongly coupled plasma experimental data on measurements of electrical conductivity of hydrogen, deuterium and rare gases under intense shock compression were used. It is shown that the ratio of shear viscosity coefficient to volume density of entropy of strongly coupled plasma is of the order of a lower bound, predicted by Kovtun et al. (2005) in frames of string theory methods.

scholarly journals Warm dense matter simulation via electron temperature dependent deep potential molecular dynamics

2020 ◽  
Vol 27 (12) ◽  
pp. 122704
Author(s):  
Yuzhi Zhang ◽  
Chang Gao ◽  
Qianrui Liu ◽  
Linfeng Zhang ◽  
Han Wang ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Electron Temperature ◽  
Dense Matter ◽  
Temperature Dependent ◽  
Warm Dense Matter

scholarly journals An Investigation into the Approximations Used in Wave Packet Molecular Dynamics for the Study of Warm Dense Matter

Plasma ◽  
2021 ◽  
Vol 4 (2) ◽  
pp. 294-308
Author(s):  
William A. Angermeier ◽  
Thomas G. White
Keyword(s):  
Molecular Dynamics ◽  
Wave Packet ◽  
Hydrogen Plasma ◽  
Valence Bond ◽  
Dense Matter ◽  
Basis Set ◽  
Warm Dense Matter ◽  
Scaling Parameters ◽  
Oppenheimer Approximation ◽  
Semi Empirical

Wave packet molecular dynamics (WPMD) has recently received a lot of attention as a computationally fast tool with which to study dynamical processes in warm dense matter beyond the Born–Oppenheimer approximation. These techniques, typically, employ many approximations to achieve computational efficiency while implementing semi-empirical scaling parameters to retain accuracy. We investigated three of the main approximations ubiquitous to WPMD: a restricted basis set, approximations to exchange, and the lack of correlation. We examined each of these approximations in regard to atomic and molecular hydrogen in addition to a dense hydrogen plasma. We found that the biggest improvement to WPMD comes from combining a two-Gaussian basis with a semi-empirical correction based on the valence-bond wave function. A single parameter scales this correction to match experimental pressures of dense hydrogen. Ultimately, we found that semi-empirical scaling parameters are necessary to correct for the main approximations in WPMD. However, reducing the scaling parameters for more ab-initio terms gives more accurate results and displays the underlying physics more readily.

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