Superfluid-Insulator Transition of Interacting Multi-Component Bosons : Gutzwiller Variational and Quantum Monte Carlo Study
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概要
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Various types of superfluid-instmlator transitions are investigated for two-component latticeboson systems in two dimensions with on-site hard-core repulsion and the component-dependentintersite interaction. The mean-field phase diagram is obtained by the Gutzwiller-type variationaltechnique. Various ground-state properties are also studied by the quantum Monte Carlo method.Our model exhibits two types of diagonal long-range orders; the density order around the densityn = 172 and the Ising-type cornponent order near n : 1. In contrast to the Gutzwiller results,the IVIonte Carlo results show that the continuous growth of the component correlation severelysuppresses the superflvridity as well as the inverse of the effective ll12LSS in the critical region of thecomponent order transition. We propose a rrtechaniszn of this rnass enhancement observed evenfar from the Mott insulating filling n : l, when the Ising-type component order persists inton $ l. Possible relevance of this type of mass enhanceument in other systems is also discussed.
- 社団法人日本物理学会の論文
- 1996-07-15
著者
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Motome Yukitoshi
Institute For Solid State Physics University Of Tokyo
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Imada Masatoshi
Institute For Solid State Physics The University Of Tokyo
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