4.7 Article

Kinetic studies of exchange-correlation effect on the collective excitations of warm dense plasmas

Journal

PHYSICAL REVIEW E
Volume 105, Issue 4, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevE.105.045206

Keywords

-

Funding

  1. National Natural Science Foundation of China [11875235, 12075204]
  2. Strategic Priority Research Program of Chinese Academy of Sciences [XDA250050500]
  3. Science Challenge Project [TZ2016005]

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This paper investigates the important role of exchange-correlation of electrons in warm dense matter and analyzes the excitations of electrostatic waves. It is found that the exchange-correlation effect has a significant influence on the group velocity of electrostatic waves. Moreover, the results obtained from different kinetic theories are compared and the differences among them are discussed.
The exchange-correlation of electrons, as a fundamental effect in quantum mechanics, plays an important role in the collective motions of electrons in warm dense matter. We derive the quantum kinetic equations based on the time-dependent Kohn-Sham equation. By using a temperature-dependent functional for the exchange correlation, the excitations of electrostatic waves are analyzed under the adiabatic local density approximation (ALDA). We find that the influences of the exchange-correlation effect on the group velocity of electrostatic waves can be as high as 10% when both the density and temperature are low. Moreover, we also compare the results obtained by using ALDA-based kinetic theory, exchange kinetic theory, and quantum hydrodynamics, and discuss the differences among them.

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