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DY: Fachverband Dynamik und Statistische Physik

DY 26: Posters - Statistical Physics, Stochastic Thermodynamics

DY 26.12: Poster

Dienstag, 21. März 2017, 18:15–21:00, P3

Phase diagram and critical phase transitions of driven granular matter in quasi 2d — •Thomas Schindler and Sebastian Kapfer — Theorie 1, FAU Erlangen

Driven granular matter exhibits a rich variety of nonequilibrium phases [1,2]. Recently, a critical transition to a state with quadratic order has been reported, with several critical exponents measurable [3]. We study this set-up by computer simulations, which consists of spherical particles between two horizontal plates. The particles are agitated by vibrating the plates in vertical direction. The energy injection is balanced by energy loss through inelastic collisions of the granular particles. Thus, the system reaches a steady state which exhibits phase behavior similar to equilibrium systems. The gap between the plates is about two particle diameters allowing the particles to form - besides fluid-like states - hexagonal and quadratic bilayers. We determine the relevant parameters for formation of ordered states, present a numerical phase diagram for this system, and study phase coexistence and criticality.

[1] Melby et al, J.Phys. Condens. Matter 17, S2689 (2005)

[2] Reyes and Urbach, Phys. Rev. E 78, 051301 (2008)

[3] Castillo et al, Phys. Rev. Lett. 109, 095701 (2012)