Ionization potential depression and Pauli blocking in degenerate plasmas at extreme densities

Abstract

New facilities explore warm dense matter (WDM) at extreme conditions where the densities are very high (e.g., carbon up to density of 50 g cm${}^{-3}$) so that electrons are degenerate even at 100 eV temperature. Whereas in the non-degenerate region correlation effects such as Debye screening and its improvements are relevant for the ionization potential depression (IPD), new effects have to be considered in degenerate plasmas. In addition to the Fock shift of the self-energies, the bound-state Pauli blocking becomes important with increasing density. Taking these degeneracy effects into account leads to a reduction of the ionization potential and to a higher degree of ionization. Standard approaches to IPD such as Stewart-Pyatt and widely used opacity tables (e.g., OPAL) do not contain Pauli blocking effects for bound states so that they fail to explain experiments with WDM in the high density region. As example, results for the ionization degree of carbon plasmas are presented.

arXiv comment15 pages, 3 figures

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• Reconciling ionization energies and band gaps of warm dense matter derived with ab initio simulations and average atom models
• Transient ionization potential depression in nonthermal dense plasmas at high x-ray intensity
• Investigating Mechanisms of State Localization in Highly-Ionized Dense Plasmas
• Hard-core Radius of Nucleons within the Induced Surface Tension Approach
• Scrutinizing the Debye plasma model: Rydberg excitons unravel the properties of low-density plasmas in semiconductors
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• Ionization potential depression and Fermi barrier in warm dense matter--a first--principles approach
• Impact of free electron degeneracy on collisional rates in plasmas
• Resolution of hyper-triton chemical freeze-out puzzle in high energy nuclear collisions
• Pauli blocking effects in thermalization of relativistic plasma
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• Pauli Blocking in Degenerate Plasmas and the Separable Potential Approach
• Ionization potential depression in degenerate plasmas and Pauli blocking of multi-electron ions
• Generalized Beth-Uhlenbeck Approach to the 2+1D Gross-Neveu Model