Free-Electron X-Ray Laser Measurements of Collisional-Damped Plasmons in Isochorically Heated Warm Dense Matter

Sperling, P.; Gamboa, E. J.; Lee, H.J.; Chung, H.‐K.; Galtier, E.; Omarbakiyeva, Y. A.; Reinholz, H.; Röpke, G.; Zastrau, U.; Hastings, J. B.; Fletcher, L. B.; Glenzer, S. H.

doi:10.1103/physrevlett.115.115001

Cited by 145 publications

(165 citation statements)

References 63 publications

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“…In both sections, we systematically compare the computational cost of our orbital-free approach with the KohnSham method. Finally, special attention is given to the electrical conductivity of warm dense aluminum at 2.7 g/cm 3 in view of the recent experimental determination at the Linac Coherent Light Source facility reported in [2]. We find the latter experimental conductivity results to be inconsistent with our orbital-free DFT results, for which we provide further discussion.…”

Section: Introductioncontrasting

confidence: 54%

Ionic and electronic transport properties in dense plasmas by orbital-free density functional theory

Sjostrom

Daligault

2015

Phys. Rev. E

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We validate the application of our recent orbital-free density functional theory (DFT) approach, [Phys. Rev. Lett. 113, 155006 (2014)], for the calculation of ionic and electronic transport properties of dense plasmas. To this end, we calculate the self-diffusion coefficient, the viscosity coefficient, the electrical and thermal conductivities, and the reflectivity coefficient of hydrogen and aluminum plasmas. Very good agreement is found with orbital-based Kohn-Sham DFT calculations at lower temperatures. Because the method does not scale with temperature, we can produce results at much higher temperatures than is accessible by the Kohn-Sham method. Our results for warm dense aluminum at solid density are inconsistent with the recent experimental results reported by Sperling et al. [Phys. Rev. Lett. 115, 115001 (2015)].

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Section: Introductioncontrasting

confidence: 54%

Ionic and electronic transport properties in dense plasmas by orbital-free density functional theory

Sjostrom

Daligault

2015

Phys. Rev. E

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“…Hence the use of a spherically average S(k) is consistent, and probably within the large error bars of current LCLS experiments (see Fig.4, Ref. [26]). The NPA σ uf results (Fig.…”

Section: Ultra-fast Conductivitymentioning

confidence: 92%

“…[26]. Calculations of σ ic using an orbital-free (OF) form of DFT and MD revealed sharp disagreement with the LCLS data [27].…”

Section: The Conductivities Of Wdm Aluminummentioning

confidence: 99%

Isochoric, isobaric, and ultrafast conductivities of aluminum, lithium, and carbon in the warm dense matter regime

et al. 2017

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We study the conductivities σ of (i) the equilibrium isochoric state (σis), (ii) the equilibrium isobaric state (σ ib ), and also the (iii) non-equilibrium ultrafast matter (UFM) state (σ uf ) with the ion temperature Ti less than the the electron temperature Te. Aluminum, lithium and carbon are considered, being increasingly complex warm dense matter (WDM) systems, with carbon having transient covalent bonds. First-principles calculations, i.e., neutral-pseudoatom (NPA) calculations and density-functional theory (DFT) with molecular-dynamics (MD) simulations, are compared where possible with experimental data to characterize σic, σ ib and σ uf . The NPA σ ib are closest to the available experimental data when compared to results from DFT+MD, where simulations of about 64-125 atoms are typically used. The published conductivities for Li are reviewed and the value at a temperature of 4.5 eV is examined using supporting X-ray Thomson scattering calculations. A physical picture of the variations of σ with temperature and density applicable to these materials is given. The insensitivity of σ to Te below 10 eV for carbon, compared to Al and Li, is clarified.

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“…However, their interpretation is complicated by the transient and often nonequilibrium nature of the plasmas, and they do not provide model-independent information on the effects of particle correlations at short time scales. These include, for example, measurement of the dynamic structure factor with x-ray Thomson scattering [29][30][31] and measurement of electrical conductivity using a variety of techniques [29,[32][33][34][35]. Comprehensive studies of selfdiffusivity [20,21,[36][37][38] exist for strongly coupled dusty plasmas, but these systems are typically two dimensional and, therefore, do not directly illuminate the kinetics of bulk, three-dimensional plasmas.…”

Section: Introductionmentioning

confidence: 99%

Experimental Measurement of Self-Diffusion in a Strongly Coupled Plasma

et al. 2016

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We present a study of the collisional relaxation of ion velocities in a strongly coupled, ultracold neutral plasma on short time scales compared to the inverse collision rate. The measured average velocity of a tagged population of ions is shown to be equivalent to the ion-velocity autocorrelation function. We thus gain access to fundamental aspects of the single-particle dynamics in strongly coupled plasmas and to the ion self-diffusion constant under conditions where experimental measurements have been lacking. Nonexponential decay towards equilibrium of the average velocity heralds non-Markovian dynamics that are not predicted by traditional descriptions of weakly coupled plasmas. This demonstrates the utility of ultracold neutral plasmas for studying the effects of strong coupling on collisional processes, which is of interest for dense laboratory and astrophysical plasmas.

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Free-Electron X-Ray Laser Measurements of Collisional-Damped Plasmons in Isochorically Heated Warm Dense Matter

Cited by 145 publications

References 63 publications

Ionic and electronic transport properties in dense plasmas by orbital-free density functional theory

Ionic and electronic transport properties in dense plasmas by orbital-free density functional theory

Isochoric, isobaric, and ultrafast conductivities of aluminum, lithium, and carbon in the warm dense matter regime

Experimental Measurement of Self-Diffusion in a Strongly Coupled Plasma

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