Regensburg 2002 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 50: Statistische Physik fernab vom Gleichgewicht III

DY 50.3: Vortrag

Freitag, 15. März 2002, 10:45–11:00, H2

Broken symmetries and directed collective energy transport — •A. Miroshnichenko¹, S. Flach¹, Y. Zolotaryuk², and M. V. Fistul¹ — ¹Max-Planck-Institut für Physik komplexer Systeme — ²IMM, TechnicalUniversity of Denmark, Denmark

We study the appearance of directed energy current in homogeneous spatially extended systems coupled to a heat bath in the presence of an external ac field E(t). The systems are described by nonlinear field equations. By making use of a symmetry analysis we predict the right choice of E(t) and obtain directed energy transport for systems with a nonzero topological charge Q. We demonstrate that the symmetry properties of motion of topological solitons (kinks and antikinks) are equivalent to the ones for the energy current. Numerical simulations confirm the predictions of the symmetry analysis and moreover, show that the directed energy current drastically increases as the dissipation reduces. Our results generalize recent rigorous theories of currents generated by broken time-space symmetries to the case of interacting many-particle systems.