caa a22 4500 44536615X CHVBK 20180317142931.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s10909-010-0251-y doi (NATIONALLICENCE)springer-10.1007/s10909-010-0251-y Quantum Monte Carlo Simulations oftheKosterlitz-Thouless Transition forTwo-Dimensional Disordered Bose-Hubbard Model [Elektronische Daten] [H. Kuroyanagi, M. Tsukamoto, M. Tsubota] In two-dimensional (2D) Bose systems, it is well known that Koterlitz-Thouless (KT) transition occurs. In this report, we perform quantum Monte Carlo simulations to investigate the 2D disordered Bose-Hubbard model. The chemical potential is assumed to depend on the site randomly and its distribution is given by a Gaussian distribution. The KT transition is confirmed from the finite-size analysis of superfluid density and the critical exponent of correlation function. By changing the variance of the Gaussian distribution, we found that the transition temperature decreases as the variance increases. The phase diagram is obtained to show the superfluid and the disordered phases. We try to understand our results by using the concept of "percolation”. Springer Science+Business Media, LLC, 2010 Kosterlitz-Thouless transition nationallicence Superfluid nationallicence Quantum Monte Carlo simulation nationallicence Kuroyanagi H. Department of Physics, Osaka City University, Sumiyoshi-ku, 558-8585, Osaka, Japan aut Tsukamoto M. Department of Physics, Osaka City University, Sumiyoshi-ku, 558-8585, Osaka, Japan aut Tsubota M. Department of Physics, Osaka City University, Sumiyoshi-ku, 558-8585, Osaka, Japan aut Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 162/5-6(2011-03-01), 609-616 0022-2291 162:5-6<609 2011 162 10909 https://doi.org/10.1007/s10909-010-0251-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10909-010-0251-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kuroyanagi H. Department of Physics, Osaka City University, Sumiyoshi-ku, 558-8585, Osaka, Japan aut NATIONALLICENCE 700 1- Tsukamoto M. Department of Physics, Osaka City University, Sumiyoshi-ku, 558-8585, Osaka, Japan aut NATIONALLICENCE 700 1- Tsubota M. Department of Physics, Osaka City University, Sumiyoshi-ku, 558-8585, Osaka, Japan aut NATIONALLICENCE 773 0- Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 162/5-6(2011-03-01), 609-616 0022-2291 162:5-6<609 2011 162 10909 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer