The uniform electron gas at warm dense matter conditions

Self Cite

We analyse the simulation of strongly degenerate electrons at finite temperature using the recently introduced permutation blocking path integral Monte Carlo (PB‐PIMC) method [T. Dornheim et al., New J. Phys. 17, 073017 (2015)]. As a representative example, we consider electrons in a harmonic confinement and carry out simulations for up to P = 2000 so‐called imaginary‐time propagators – an important convergence parameter within the PIMC formalism. This allows us to study the P‐dependence of different observables of the configuration space in the Monte Carlo simulations and of the fermion sign problem. We find a surprisingly persisting effect of the permutation blocking for large P, which is explained by comparing different length scales. Finally, we touch upon the uniform electron gas in the warm dense matter regime.

“…The corresponding configuration weights are positive and negative. Reproduced from Dornheim et al with the permission of the authors. Copyright Elsevier BV…”

Section: Theorymentioning

confidence: 99%

“…The permutation blocking PIMC method significantly extends standard PIMC simulations towards stronger quantum degeneracy as it occurs, for example, in the warm dense matter regime …”

Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Permutation blocking path integral Monte Carlo simulations of degenerate electrons at finite temperature

Dornheim

Groth

Bönitz

2019

Self Cite

“…Note that an effect related to the energy (frequency) dependence of the electronic collisions may manifest itself at very high values of the streaming velocity, M ≫ 1, but the latter case is out of the scope of the present work and is left for future studies. Finally, we note that an alternative to include correlation effects in the electronic dielectric function is via local field corrections that can be obtained, for warm dense electrons, via quantum Monte Carlo simulations …”

Section: Resultsmentioning

confidence: 99%

Effect of the dynamical collision frequency on quantum wakefields

Moldabekov

Amirov

Ludwig

et al. 2019

Previous papers on the quantum wakefield around an ion moving in a dense plasma have considered the collision frequency in the static approximation. In this work, we present the results of the dynamically screened ion potential taking into account the dynamical electron–ion collision frequency. The Lenard–Balescu dynamical collision frequency and various approximations to it are considered. As a main result of our investigation for the subsonic, sonic, and supersonic regimes, we find that the frequency dependence of collisions can be safely discarded if the electronic streaming velocity (relative to an ion) is comparable to or less than the electronic Fermi velocity.

Propagation of electrostatic energy through a quantum plasma

Moradi

2018

The theory of propagation of electrostatic energy through an infinite, homogeneous electron-ion quantum plasma is presented. Simple expressions for the energy flow, energy density, and energy velocity of longitudinal oscillation waves in the system are derived using the linearized quantum hydrodynamic theory for the electron fluid, which incorporates the important quantum statistical pressure and electron diffraction force, while the optical response of the ion particles is characterized by the classical frequency-dependent dielectric function, ion . Both cases of plasmon (high-frequency) and quantum ion-acoustic (low-frequency) waves are considered. KEYWORDSelectrostatic wave, energy density, energy flow, quantum plasma 1