Wave spectra of two-dimensional dusty plasma solids and liquids

Abstract

Brownian dynamics simulations were carried out to study wave spectra of two-dimensional dusty plasma liquids and solids for a wide range of wavelengths. The existence of a longitudinal dust thermal mode was confirmed in simulations, and a cutoff wavenumber in the transverse mode was measured. Dispersion relations, resulting from simulations, were compared with those from analytical theories, such as the random-phase approximation (RPA), quasi-localized charged approximation (QLCA), and harmonic approximation (HA). An overall good agreement between the QLCA and simulations was found for wide ranges of states and wavelengths after taking into account the direct thermal effect in the QLCA, while for the RPA and HA good agreement with simulations were found in the high and low temperature limits, respectively.

Spontaneous generation of temperature anisotropy in a strongly coupled magnetized plasma

“…It is known that the relevant magnetic field strengths at which a strongly coupled plasma (Γ = 100) is appreciably influenced by the magnetic field is on the order of unity, β ≈ 1 [29][30][31][32][33][34][35][36][37][38][39]. This indicates that the system is in the pycnonuclear regime and our simulations can provide novel insight into the physics of SCPs.…”

Onset of transverse (shear) waves in strongly-coupled Yukawa fluids

“…Equation (5) with a fixed relaxation time is to some extent similar to heuristic approaches suggested previously. 34,50 The cutoff wave number for the onset of the transverse mode in this approximation reads…”

“…Not surprisingly, it received considerable attention in the context of complex (dusty) plasmas within the YOCP concept. [31][32][33][34][35] The purpose of this article is to present simple yet accurate analytical approach to describe quantitatively the transverse dispersion relation in strongly coupled YOCP. Recent developments related to the thermodynamics, transport and collective modes in Yukawa fluids are combined in order to derive useful practical expressions describing the transverse mode, including the existence and location of the critical wave number q * .…”

Collective modes of two-dimensional classical Coulomb fluids

“…The blue curves shows a phenomenological approach ω 2 l = 2k 2 v 2 T + L 2 (k) suggested previously for 2D Yukawa fluids. 73 term L(k) 2 with the 2D ideal gas kinetic term 2k 2 v 2 T . Such a phenomenological approach has been previously proposed in the context of collective modes in 2D dusty plasmas with Debye-Hückel (Yukawa) interaction.…”