New multiple histogram method for studying phase transitions |
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Authors: | Oliver Hammrich |
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Institution: | (1) Laboratoire de Physique des Solides (CNRS 74), Université Paul-Sabatier, 118 Route de Narbonne, F-31062 Toulouse, France |
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Abstract: | For temperature zero the effects of disorder for interacting bosons are considered. The disorder induced superfluid-insulator transition in thed-dimensional disordered Bogoliubov model is discussed. Results for a short-range and a long-range random potential are given. For short-range disorder we argue that ford<4 arbitrarily small disorder localizes the Bose condensate for vanishing interaction potential. Ford>4 a certain strength of the disorder potential is necessary in order to localize the condensate. For the three-dimensional Bogoliubov model our results are in agreement with a recent calculation. We compare our theoretical predictions with numerical experiments for a disordered boson Hubbard model. |
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Keywords: | 05 30 Jp 74 65 +n 74 70 Jm |
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