Katharina Janzen

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We investigate the Lévy glass, a mean-field spin-glass model with power-law distributed couplings characterized by a divergent second moment. By combining extensively many small couplings with a spare random backbone of strong bonds the model is intermediate between the Sherrington-Kirkpatrick and the Viana-Bray models. A truncated version where couplings(More)
Juan Carlos Andresen,1 Katharina Janzen,2 and Helmut G. Katzgraber3,1 1Theoretische Physik, ETH Zurich, CH-8093 Zurich, Switzerland 2Institut für Physik, Carl-von-Ossietzky-Universität, 26111 Oldenburg, Germany 3Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843-4242, USA (Received 8 February 2011; revised manuscript(More)
We study the critical behavior of Boolean variables on scale-free networks with competing interactions (Ising spin glasses). Our analytical results for the disorder-network-decay-exponent phase diagram are verified using Monte Carlo simulations. When the probability of positive (ferromagnetic) and negative (antiferromagnetic) interactions is the same, the(More)
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