Dresden 2009 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 26: Poster II

DY 26.4: Poster

Donnerstag, 26. März 2009, 16:00–18:00, P1A

Free Energy Inherent Structures in Spin Glass Models — •Mathias Aust, Elmar Bittner, and Wolfhard Janke — Institut für Theoretische Physik, Universität Leipzig, Postfach 100920, 04009 Leipzig, Germany

One important feature of the glass phase of spin glasses is its rugged energy landscape. While at zero temperature the (possibly degenerate) ground state dominates, local energy minima with higher minimum energy and the entropy of the corresponding valleys become important at higher temperatures. Especially the configurational entropy (the complexity) of the spin glass at different temperatures is of interest.

These quantities can be obtained from Monte Carlo simulations using the free energy inherent structure (FEIS) approach introduced in Coluzzi et al., A new method to compute the configurational entropy in glassy systems, Eur. Phys. J. B 32, 495 (2003).

This method is applied to the Sherrington-Kirkpatrick (SK) model and the Edwards-Anderson Ising (EAI) model, both with a bimodal distribution for the couplings. The application of the multicanonical algorithm allows to simulate bigger system sizes for the SK model than before, while the EAI model has not been studied by this method before.