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Frustration induced quantum phases with Rydberg blockaded interactions

April 30, 2015 - 11:00am
Guido Pupillo
University of Strasbourg
We discuss the emergence of novel quantum phases in simple bosonic extended Hubbard models where particles interact via soft-shoulder potentials. In one dimension, we demonstrate that the low energy phase can be a conformal cluster Luttinger liquid where the microscopic degrees of freedom correspond to mesoscopic ensembles of particles [1]. This phase has qualitatively new features with respect to the conventional Tomonaga-Luttinger liquid [2]. In two dimensions, we provide a microscopic path for the realization of an exotic superglass phase, where superfluidity coexists with structural disorder. Remarkably, such a phase occurs in the absence of any externally imposed frustration, e.g., in the lattice geometry or in the interactions [3]. Given the simplicity and generality of the models, these phases may be relevant for experiments with Rydberg-dressed atoms confined to optical lattices. 
[1] Cluster Luttinger Liquids of Rydberg dressed atoms in optical lattices, M. Mattioli, M. Dalmonte, W. Lechner, and G. Pupillo, Phys. Rev. Lett. 111, 165302 (2013)
[2] Cluster Luttinger liquids and emergent supersymmetric conformal critical points in the one-dimensional soft-shoulder Hubbard model, M. Dalmonte, W. Lechner, Z. Cai, M. Mattioli, A. M. Lauchli, and G. Pupillo, arXiv:1502.00396 
[1] Superglass phase of Rydberg atoms, A. Angelone, F. Mezzacapo, and G. Pupillo, arXiv:1504.00346
2115 Computer and Space Sciences
College Park, MD 20742

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