SUPERCONDUCTOR MOTT-INSULATOR TRANSITION IN BOSE SYSTEMS WITH FINITE-RANGE INTERACTIONS

被引：107

作者：

BRUDER, C

FAZIO, R

SCHON, G

机构：

[1] UNIV CATANIA, IST FIS, I-95128 CATANIA, ITALY

[2] UNIV CALIF SANTA BARBARA, INST THEORET PHYS, SANTA BARBARA, CA 93106 USA

来源：

PHYSICAL REVIEW B | 1993年 / 47卷 / 01期

关键词：

D O I：

10.1103/PhysRevB.47.342

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study the superconductor-insulator transition of Bose-Hubbard models with finite-range interactions. Commensurability of the charge distribution with the underlying lattice leads to a richly structured phase diagram. In addition to the lobes of insulating phase characterized by integer fillings, we find-for finite-range interactions-lobes with rational filling factors. At low temperatures we can investigate the phase transition by mapping the model onto a XXZ spin-1/2 Heisenberg model.

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页码：342 / 347

页数：6

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