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15.20.Ol Optical lattices

Tunneling-Induced Restoration of the Degeneracy and the Time-Reversal Symmetry Breaking in Optical Lattices

Fri, 2013-12-06 15:45 - Daniel Cavalcanti
Date: 
2013-11-19 - 2013-12-06
Author(s): 

Tomasz Sowiński, Mateusz Łacki, Omjyoti Dutta, Joanna Pietraszewicz, Piotr Sierant, Mariusz Gajda, Jakub Zakrzewski, Maciej Lewenstein

Reference: 

Phys. Rev. Lett. 111, 215302 (2013)

URL: 

http://prl.aps.org/abstract/PRL/v111/i21/e215302

We study the ground-state properties of bosons loaded into the 

Topological insulators in dynamically generated lattices

Fri, 2013-12-06 15:38 - Daniel Cavalcanti
Date: 
2013-04-24 - 2013-12-06
Author(s): 

O. Dutta, A. Przysiezna, M. Lewenstein

Reference: 

arXiv:1301.4156 [cond-mat.quant-gas]

URL: 

http://arxiv.org/abs/1301.4156

Topological insulators are of fundamental and technological importance due to their exotic excitations that allow for robust transport of charges (matter) on the boundary and thus have potential applications in spintronics, quantum computing and spintomics.

Frustration by population trapping with polar molecules

Thu, 2013-12-05 19:05 - Daniel Cavalcanti
Date: 
2013-10-29 - 2013-12-05
Author(s): 

O. Dutta, M. Lewenstein, J. Zakrzewski

Reference: 

arXiv:1310.7757 [cond-mat.quant-gas]

URL: 

http://arxiv.org/abs/1310.7757

One of the most important fundamental problems in contemporary physics is to understand the effects of frustration in quantum many-body systems. Typically, frustration is induced by lattice geometries, disorder and/or strong interactions.

Synthetic gauge fields in synthetic dimensions

Thu, 2013-12-05 18:46 - Daniel Cavalcanti
Date: 
2014-01-28
Author(s): 

A. Celi, P. Massignan, J. Ruseckas, N. Goldman, I.B. Spielman, G. Juzeliunas, M. Lewenstein

Reference: 

Phys. Rev. Lett. 112, 043001 (2014)

URL: 

http://arxiv.org/abs/1307.8349

We describe a simple technique for generating a cold-atom lattice pierced by a uniform magnetic field. Our method is to extend a one-dimensional optical lattice into the "dimension" provided by the internal atomic degrees of freedom, yielding a synthetic 2D lattice. Suitable laser-coupling between these internal states leads to a uniform magnetic flux within the 2D lattice.

Thermalization of string order in quantum spin-1 chains

Thu, 2013-11-28 16:02 - Davide Rossini
Date: 
2013-11-11
Author(s): 

Leonardo Mazza, Davide Rossini, Manuel Endres, Rosario Fazio

Reference: 

arXiv:1311.2615v1

URL: 

http://arxiv.org/pdf/1311.2615.pdf

We investigate the equilibration dynamics of non-local order in a one-dimensional quantum system. After initializing a spin-1 chain in the Haldane phase, the time evolution of string correlations following a sudden quench is studied by means of matrix-product-state-based algorithms. Thermalization occurs only for scales up to a horizon which grows at a well defined speed, due to the finite maximal velocity at which string correlations can propagate, related to a Lieb-Robinson bound.

Quantum simulations of gauge theories with ultracold atoms: local gauge invariance from angular momentum conservation

Tue, 2013-05-14 10:48 - Mattia Giardini
Date: 
2013-05-14
Author(s): 

Erez Zohar, J. Ignacio Cirac, Benni Reznik

Reference: 

arXiv:1303.5040v1

URL: 

http://arxiv.org/abs/1303.5040

Quantum simulations of High Energy Physics, and especially of gauge theories, is an emerging and exciting direction in quantum simulations. However, simulations of such theories, compared to simulations of condensed matter physics, must satisfy extra restrictions, such as local gauge and Lorentz invariance.

A cold-atom quantum simulator for SU(2) Yang-Mills lattice gauge theory

Tue, 2013-05-14 10:43 - Mattia Giardini
Date: 
2013-03-21
Author(s): 

Erez Zohar, J. Ignacio Cirac, Benni Reznik

Reference: 

URL: http://link.aps.org/doi/10.1103/PhysRevLett.110.125304
DOI: 10.1103/PhysRevLett.110.125304
PACS: 67.85.Hj, 11.15.Ha

Non-Abelian gauge theories play an important role in the standard model of particle physics, and unfold a partially unexplored world of exciting physical phenomena. In this Letter, we suggest a realization of a non-Abelian lattice gauge theory—SU(2) Yang-Mills in (1+1) dimensions, using ultracold atoms.

Simulating 2+1d Lattice QED with dynamical matter using ultracold atoms

Tue, 2013-05-14 10:37 - Mattia Giardini
Date: 
2013-01-29
Author(s): 

E. Zohar, J.I. Cirac, B. Reznik

Reference: 

URL: http://link.aps.org/doi/10.1103/PhysRevLett.110.055302
DOI: 10.1103/PhysRevLett.110.055302
PACS: 67.85.Hj, 11.15.Ha

We suggest a method to simulate compact quantum electrodynamics using ultracold atoms in optical lattices, which includes dynamical Dirac fermions in 2+1 dimensions. This allows us to test the dynamical effects of confinement as well as the deformations and breaking of two-dimensional flux loops, and to observe the Wilson-loop area law.

Simulating Compact Quantum Electrodynamics with Ultracold Atoms: Probing Confinement and Nonperturbative Effects

Tue, 2013-05-14 10:32 - Mattia Giardini
Date: 
2012-09-19
Author(s): 

E. Zohar, J.I. Cirac, B. Reznik

Reference: 

URL: http://link.aps.org/doi/10.1103/PhysRevLett.109.125302
DOI: 10.1103/PhysRevLett.109.125302
PACS: 67.85.Hj, 11.15.Ha

Recently, there has been much interest in simulating quantum field theory effects of matter and gauge fields. In a recent work, a method for simulating compact quantum electrodynamics (CQED) using Bose-Einstein condensates has been suggested.

Spontaneous Peierls dimerization and emergent bond order in one-dimensional dipolar gases

Fri, 2013-05-10 16:00 - Mattia Giardini
Date: 
2013-04-18
Author(s): 

M. Di Dio, L. Barbiero, A. Recati, M. Dalmonte

Reference: 

arXiv:1304.5200v1 [cond-mat.quant-gas]

URL: 

http://arxiv.org/abs/1304.5200

We investigate the effect of dipolar interactions in one-dimensional systems in connection with the possibility of observing exotic many-body effects with trapped atomic and molecular dipolar gases.

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