Phase Transitions of Finite Dust Clusters in Dusty Plasmas

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We investigate exciton bound-state formation and crystallization effects in two-dimensional electron-hole bilayers. Performing unbiased path integral Monte Carlo simulations all quantum and Coulomb correlation effects are treated on first principles. We analyze diverse pair distribution functions in dependence on the layer separation, particle density and hole-to-electron mass ratio and derive a schematic phase diagram for the neutral mass-asymmetric bilayer system. Our simulations reveal a great variety of possible phases namely an exciton gas, an exciton crystal, an electron-hole liquid and a hole crystal embedded in an electron gas.

Section: Summary and Concluding Remarksmentioning

confidence: 86%

Section: Electron-hole Bilayersmentioning

confidence: 99%

Phase Diagram of Bilayer Electron‐Hole Plasmas

Schleede

Filinov

Bönitz

et al. 2012

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“…Especially the subsonic regime, many-particle effects and the role of grain confinement need to be investigated. [53]. Since wake fields also represent a source of free energy that can drive instabilities [7], this aspect will have to be included in future explorations of phase transitions in continuation of the investigations described in the companion paper Ref.…”

Section: Discussionmentioning

confidence: 99%

“…As today's simulations are just beginning to explore this regime [31,40,45,46], the current understanding is based on experimental results. Especially for Yukawa balls [52] the structural and dynamical properties are well explored [3,53]. Especially for Yukawa balls [52] the structural and dynamical properties are well explored [3,53].…”

Section: Dust Clouds In Streaming Plasmasmentioning

confidence: 99%

Wake Formation and Wake Field Effects in Complex Plasmas

Block

Carstensen

Ludwig

et al. 2012

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The formation of wake fields downstream of an objects in flowing plasmas has strong implications on structure, stability and dynamics of complex plasmas. This paper aims at putting recent experimental investigations and different theoretical approaches on charging of dust grains, stability of dust grain arrangements and the dynamical properties of complex plasmas into perspective. Further, the combination of wake fields and grain confinement is discussed, which is the generic situation in complex plasmas. It is shown that in spherical traps the resulting competition of trap geometry and vertical alignment leads to a sophisticated mixture of nested shell and string order.

“…[7], we calculate the relevant contributions from gravity, electrostatic field force and ion drag force [10,11]. Analogously to Ref.…”

Section: Simulation Resultsmentioning

confidence: 99%

Plasma Sheath Structures in Complex Electrode Geometries

Schubert

Haass

Trottenberg

et al. 2012

The behavior of microparticles trapped in the curved plasma sheath in the corner of a horizontal rf electrode and a vertical wall is investigated by experiments and simulation. Three types of walls are studied, namely a dielectric wall, a floating conductive wall, and a conductive wall at the same potential as the rf electrode. The particle's equilibrium position provides insight in the acting forces, associated potentials and field structures. Complementary particle-in-cell simulations elucidate the structure of the charged-species densities and electric potential profile throughout the sheath. Thereby special emphasis is placed on how the sheath structure in the corner depends on the wall material.