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12 papers · 1 filter
Exchange anisotropy, disorder and frustration in diluted, predominantly ferromagnetic, Heisenberg spin systems
Chenggang Zhou, Malcolm P. Kennett, Xin Wan +2
Motivated by the recent suggestion of anisotropic effective exchange interactions between Mn spins in GaMnAs (arising as a result of spin-orbit coupling), we study thei…
Hermitian-holomorphic (2)-Gerbes and tame symbols
Ettore Aldrovandi
We observe that the line bundle associated to the tame symbol of two invertible holomorphic functions also carries a fairly canonical hermitian metric, hence it represents a class…
Low-temperature nucleation in a kinetic Ising model with soft stochastic dynamics
Kyungwha Park, Per Arne Rikvold, Gloria M. Buendia +1
We study low-temperature nucleation in kinetic Ising models by analytical and simulational methods, confirming the general result for the average metastable lifetime, <tau> = A*exp…
Update statistics in conservative parallel discrete event simulations of asynchronous systems
A. Kolakowska, M. A. Novotny, Per Arne Rikvold
We model the performance of an ideal closed chain of L processing elements that work in parallel in an asynchronous manner. Their state updates follow a generic conservative algori…
Projective Dynamics Analysis of Magnetization Reversal
G. Brown, M. A. Novotny, P. A. Rikvold
The computational Projective Dynamics method is used to analyze simulations of magnetization reversal in nanoscale magnetic pillars. It is shown that this method can be used to det…
Punctuated equilibria and 1/f noise in a biological coevolution model with individual-based dynamics
Per Arne Rikvold, R. K. P. Zia
We present a study by linear stability analysis and large-scale Monte Carlo simulations of a simple model of biological coevolution. Selection is provided through a reproduction pr…