Abstract
Plasmas in strong magnetic fields have been mainly studied in two distinct limiting cases---that of weak and strong nonideality with very different physical properties. While the former is well described by the familiar theory of Braginskii, the latter regime is closer to the behavior of a Coulomb liquid. Here we study in detail the transition between both regimes. We focus on the evolution of the dynamic structure factor of the magnetized one-component plasma from weak to strong coupling, which is studied with first-principle molecular dynamics simulations. The simulations show the vanishing of Bernstein modes and the emergence of higher harmonics of the upper hybrid mode across the magnetic field, a redistribution of spectral power between the two main collective modes under oblique angles, and a suppression of plasmon damping along the magnetic field. Comparison with results from various models, including the random phase approximation, a Mermin-type dielectric function, and the quasilocalized charge approximation show that none of the theories is capable of reproducing the crossover that occurs when the coupling parameter is on the order of unity. The findings are relevant to the scattering spectra, stopping power, and transport coefficients of correlated magnetized plasmas.
Highlights
Strong particle interactions affect the thermodynamic, transport, and dielectric properties of plasmas
The system we study is the magnetized one-component plasma, where a single charged species is embedded in a uniform neutralizing background of the opposite charge and subject to the Lorentz force induced by an external magnetic field
As will be seen below, the coupling strength manifests itself in dynamical features, which are directly observable in the dynamic structure factor (DSF)
Summary
Strong particle interactions affect the thermodynamic, transport, and dielectric properties of plasmas. Recent experimental advances in the magnetic confinement of ultracold neutral plasmas [6], high energy density matter [7], and dusty plasmas [8–11], as well as theoretical efforts concerning, e.g., the stopping power [12–15] and transport coefficients [16–24] demonstrate growing interest in the physics of magnetized strongly correlated plasmas—conditions relevant to the outer layers of neutron stars [25–29], confined antimatter [30,31], or magnetized target fusion [32,33] In this challenging regime, the familiar theory of Braginskii [34] is no longer applicable, and new theoretical concepts as well as first-principle simulations are required. None of the theories provides a consistent description of the observations as the coupling regimes are crossed
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