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Superglass phase of Rydberg atoms | Adriano Angelone
; Fabio Mezzacapo
; Guido Pupillo
; | Date: |
1 Apr 2015 | Abstract: | We investigate the quantum phases of monodispersed bosonic gases confined to
a triangular lattice and interacting via a class of soft-shoulder potentials.
The latter correspond to soft-core potentials with an additional hard-core
onsite interaction. Using exact quantum Monte Carlo simulations, we show that
the low temperature phases for weak and strong interactions are an homogeneous
superfluid and a glass, respectively. The latter is an insulating phase
characterized by inhomogeneity in the density distribution and structural
disorder. Remarkably, we find that for intermediate interaction strengths a
{it superglass} occurs in an extended region of the phase diagram, where
glassy behavior coexists with a sizable finite superfluid fraction. This
superglass is obtained in the absence of geometrical frustration or external
disorder and is a result of the competition of quantum fluctuations and cluster
formation in the corresponding classical ground state. Given the simplicity and
generality of the model, these phases should be directly relevant for
state-of-the-art experiments with Rydberg-dressed atoms in optical lattices. | Source: | arXiv, 1504.0346 | Services: | Forum | Review | PDF | Favorites |
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