Journal
PHYSICAL REVIEW LETTERS
Volume 122, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.122.015001
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Funding
- Science Challenge Project [TZ2016001]
- National NSFC [11774429, 11874424, U1830206]
- National Key R&D Program of China [2017YFA0403200]
- Science and Technology Project of Hunan Province [2017RS3038]
- Advanced Research Foundation of the National University of Defense Technology [JQ14-02-01]
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Theoretical and computational modeling of nonequilibrium processes in warm dense matter represents a significant challenge. The electron-ion relaxation process in warm dense hydrogen is investigated here by nonequilibrium molecular dynamics using the constrained electron force field (CEFF) method. CEFF evolves wave packets that incorporate dynamic quantum diffraction that obviates the Coulomb catastrophe. Predictions from this model reveal temperature relaxation times as much as three times longer than prior molecular dynamics results based on quantum statistical potentials. Through analyses of energy distributions and mean free paths, this result can be traced to delocalization. Finally, an improved GMS [Gericke, Murillo, and Schlanges, Phys. Rev. E 78, 025401 (2008)] model is proposed, in which the Coulomb logarithms are in good agreement with CEFF results.
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