2024-03-28T22:44:40Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1406652017-12-18T14:28:38Zcom_10261_135com_10261_4col_10261_388
DIGITAL.CSIC
author
Huerga, D.
author
Capponi, S.
author
Dukelsky, Jorge
author
Ortiz, G.
funder
Calcul en Midi-Pyrénées
funder
Ministerio de Economía y Competitividad (España)
funder
European Commission
2016-11-23T14:55:56Z
2016-11-23T14:55:56Z
2016-10-12
Physical Review B 94: 165124 (2016)
http://hdl.handle.net/10261/140665
10.1103/PhysRevB.94.165124
http://dx.doi.org/10.13039/501100003329http://dx.doi.org/10.13039/501100000780
We 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
eng
openAccess
Staircase of crystal phases of hard-core bosons on the kagome lattice
artículo
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URL
https://digital.csic.es/bitstream/10261/140665/1/Staircase.pdf
File
MD5
e8ec7076cfece25d79ebdb7154221f3e
1562385
application/pdf
Staircase.pdf