Molecular dynamics calculation for the modified xy model |
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| Authors: | Peter Litz Stefan Langenbach Alfred Hüller |
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| Affiliation: | (1) Institut für Theoretische Physik I, Universität Erlangen, W-8520 Erlangen, Germany;(2) Present address: Siemens AG, Munich, Germany;(3) Present address: Neugebauer Software, Nuremberg, Germany |
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| Abstract: | In order to demonstrate the effectiveness of molecular dynamics (MD) for the determination of the density of states of a system that suffers an abrupt change of state, we have performed extensive calculations for the modified rotor model, defined by the interaction potentialV( ) = 2J{1 – [cos(/2)]p2} between neighboring rotors. Our results for 2-dimensionalL×L lattices withL=8, 16, 32, and 64 demonstrate clearly that the transition is continuous forp2 24, but suggest a first-order transition forp2 28. |
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| Keywords: | Modifiedxy model first order-transitions molecular dynamics calculations. |
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