Výsledky vyhledávání - "Ahrens, Björn"

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Diluted antiferromagnets in a field seem to be in a different universality class than the random-field Ising model

Autor: Ahrens, Bjoern, Xiao, Jianping, Hartmann, Alexander K., Katzgraber, Helmut G.

Publikováno v: Phys. Rev. B 88, 174408 (2013)

We perform large-scale Monte Carlo simulations using the Machta-Newman-Chayes algorithms to study the critical behavior of both the diluted antiferromagnet in a field with 30% dilution and the random-field Ising model with Gaussian random fields for

Externí odkaz: http://arxiv.org/abs/1302.2480

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Excitations in high-dimensional random-field Ising magnets

Autor: Ahrens, Bjoern, Hartmann, Alexander K.

Domain walls and droplet-like excitation of the random-field Ising magnet are studied in d={3,4,5,6,7} dimensions by means of exact numerical ground-state calculations. They are obtained using the established mapping to the graph-theoretical maximum-

Externí odkaz: http://arxiv.org/abs/1201.0493

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Critical behavior of the Random-Field Ising Magnet with long range correlated disorder

Autor: Ahrens, Björn, Hartmann, Alexander K.

We study the correlated-disorder driven zero-temperature phase transition of the Random-Field Ising Magnet using exact numerical ground-state calculations for cubic lattices. We consider correlations of the quenched disorder decaying proportional to

Externí odkaz: http://arxiv.org/abs/1106.6244

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Critical behavior of the Random-Field Ising model at and beyond the Upper Critical Dimension

Autor: Ahrens, Björn, Hartmann, Alexander K.

The disorder-driven phase transition of the RFIM is observed using exact ground-state computer simulations for hyper cubic lattices in d=5,6,7 dimensions. Finite-size scaling analyses are used to calculate the critical point and the critical exponent

Externí odkaz: http://arxiv.org/abs/1010.2911

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