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DY: Fachverband Dynamik und Statistische Physik

DY 52: Glasses and Glass transition (joint session DY/ DF/ CPP)

DY 52.6: Vortrag

Donnerstag, 19. März 2015, 16:30–16:45, BH-N 128

Where to go in a rough free-energy landscape? — •Stefan Schnabel and Wolfhard Janke — Universität Leipzig

Frustrated spin systems like the Edwards-Anderson spin glass are notorious for disorder-induced frustration. Sampling their rough free-energy landscape is very challenging and only small systems can be investigated. Over the years great efforts have been made to improve both hardware and implementation, yet the basic method for the investigation of 3d spin glasses is and has been parallel tempering [1]. Here, we explore the possibility of using additional information obtained by a local minimization procedure similar to the basin-hopping algorithm [2]. Altering the statistical weight of conformations according to the depth of nearby local minima can reduce autocorrelation time. We investigate whether this improvement outweighs the additional computational cost.

[1] K. Hukushima and K. Nemoto, J. Phys. Soc. Japan 65 (1996) 1604. [2] D. J. Wales, J. Phys. Chem. A 101 (1997) 5111.