English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/140665
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Título

Staircase of crystal phases of hard-core bosons on the kagome lattice

AutorHuerga, D.; Capponi, S.; Dukelsky, Jorge ; Ortiz, G.
Fecha de publicación12-oct-2016
EditorAmerican Physical Society
CitaciónPhysical Review B 94: 165124 (2016)
ResumenWe study the quantum phase diagram of a system of hard-core bosons on the kagome lattice with nearest-neighbor repulsive interactions, for arbitrary densities, by means of the hierarchical mean-field theory and exact diagonalization techniques. This system is isomorphic to the spin S=1/2 XXZ model in presence of an external magnetic field, a paradigmatic example of frustrated quantum magnetism. In the nonfrustrated regime, we find two crystal phases at densities 1/3 and 2/3 that melt into a superfluid phase when increasing the hopping amplitude, in semiquantitative agreement with quantum Monte Carlo computations. In the frustrated regime and away from half-filling, we find a series of plateaux with densities commensurate with powers of 1/3. The broader density plateaux (at densities 1/3 and 2/3) are remnants of the classical degeneracy in the Ising limit. For densities near half-filling, this staircase of crystal phases melts into a superfluid, which displays finite chiral currents when computed with clusters having an odd number of sites. Both the staircase of crystal phases and the superfluid phase prevail in the noninteracting limit, suggesting that the lowest dispersionless single-particle band may be at the root of this phenomenon. ©2016 American Physical Society
Descripción14 págs.; 12 figs.
Versión del editorhttps://doi.org/10.1103/PhysRevB.94.165124
URIhttp://hdl.handle.net/10261/140665
DOI10.1103/PhysRevB.94.165124
Identificadoresdoi: 10.1103/PhysRevB.94.165124
issn: 1550-235X
Aparece en las colecciones: (CFMAC-IEM) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
Staircase.pdf1,53 MBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 

Artículos relacionados:


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.