Modified spin-wave theory and spin-liquid behavior of cold bosons on an inhomogeneous triangular lattice

被引：8

作者：

Celi, Alessio ^{[1
]}

Grass, Tobias ^{[1
]}

Ferris, Andrew J. ^{[1
]}

Padhi, Bikash ^{[2
,3
]}

Raventos, David ^{[1
]}

Simonet, Juliette ^{[4
,5
]}

Sengstock, Klaus ^{[4
,5
]}

Lewenstein, Maciej ^{[1
,6
]}

机构：

[1] Barcelona Inst Sci & Technol, ICFO Inst Ciencies Foton, Castelldefels 08860, Spain

[2] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

[3] Univ Illinois, Inst Condensed Matter Theory, Urbana, IL 61801 USA

[4] Univ Hamburg, Inst Laserphys, Luruper Chaussee 149, D-22761 Hamburg, Germany

[5] Univ Hamburg, Zentrum Opt Quantentechnol, Luruper Chaussee 149, D-22761 Hamburg, Germany

[6] ICREA, Lluis Co 23, Barcelona 08010, Spain

来源：

PHYSICAL REVIEW B | 2016年 / 94卷 / 07期

关键词：

RESONATING-VALENCE-BOND; KAGOME HEISENBERG-ANTIFERROMAGNET; GROUND-STATE; ENTANGLEMENT ENTROPY; OPTICAL LATTICES; MODEL; SUPERCONDUCTIVITY; EXCITATIONS; MAGNETS; PHASES;

D O I：

10.1103/PhysRevB.94.075110

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Ultracold bosons in a triangular lattice are a promising candidate for observing quantum spin liquid behavior. Here we investigate, for such system, the role of a harmonic trap giving rise to an inhomogeneous density. We construct a modified spin-wave theory for arbitrary filling and predict the breakdown of order for certain values of the lattice anisotropy. These regimes, identified with the spin liquid phases, are found to be quite robust upon changes in the filling factor. This result is backed by an exact diagonalization study on a small lattice.

引用

页数：16

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