Triangular and honeycomb lattices of cold atoms in optical cavities

Safaei, Shabnam; Miniatura, Christian; Grémaud, Benoît

doi:10.1103/physreva.92.043810

Cited by 18 publications

(15 citation statements)

References 45 publications

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“…As the critical Rabi amplitude W µ D | | c A is decreased, close to the onset of superradiance, direct intercavity scattering will eventually be the dominant effect. The role of these processes, together with different choices of the retroreflection phase-shift, have been theoretically investigated in [28,29].…”

Section: Model and Symmetriesmentioning

confidence: 99%

Collective excitations and supersolid behavior of bosonic atoms inside two crossed optical cavities

2017

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We discuss the nature of symmetry breaking and the associated collective excitations for a system of bosons coupled to the electromagnetic field of two optical cavities. For the specific configuration realized in a recent experiment at ETH [1, 2], we show that, in absence of direct intercavity scattering and for parameters chosen such that the atoms couple symmetrically to both cavities, the system possesses an approximate U(1) symmetry which holds asymptotically for vanishing cavity field intensity. It corresponds to the invariance with respect to redistributing the total intensity = + I I I 1 2OPEN ACCESS RECEIVED

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Section: Model and Symmetriesmentioning

confidence: 99%

Collective excitations and supersolid behavior of bosonic atoms inside two crossed optical cavities

2017

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“…A microscopic picture of the coupled system is obtained by considering Raman processes between transverse pump and cavity modes which coherently transfer atoms between the motional ground state and excited momentum states ( Fig. 1c) [23,25]. Their energies split into ω + = 3 ω rec and ω − = ω rec due to the angle of 60 • between transverse pump and cavities, with the single photon recoil frequency ω rec .…”

mentioning

confidence: 99%

Supersolid formation in a quantum gas breaking a continuous translational symmetry

Léonard¹,

Morales²,

Zupancic³

et al. 2017

Nature

477

437

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The concept of a supersolid state combines the crystallization of a many-body system with dissipationless flow of the atoms from which it is built. This quantum phase requires the breaking of two continuous symmetries: the phase invariance of a superfluid and the continuous translational invariance to form the crystal. Despite having been proposed for helium almost 50 years ago, experimental verification of supersolidity remains elusive. A variant with only discrete translational symmetry breaking on a preimposed lattice structure-the 'lattice supersolid'-has been realized, based on self-organization of a Bose-Einstein condensate. However, lattice supersolids do not feature the continuous ground-state degeneracy that characterizes the supersolid state as originally proposed. Here we report the realization of a supersolid with continuous translational symmetry breaking along one direction in a quantum gas. The continuous symmetry that is broken emerges from two discrete spatial symmetries by symmetrically coupling a Bose-Einstein condensate to the modes of two optical cavities. We establish the phase coherence of the supersolid and find a high ground-state degeneracy by measuring the crystal position over many realizations through the light fields that leak from the cavities. These light fields are also used to monitor the position fluctuations in real time. Our concept provides a route to creating and studying glassy many-body systems with controllably lifted ground-state degeneracies, such as supersolids in the presence of disorder.

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“…For example, the organization of bosonic atoms into triangular or hexagonal lattices [33] or of fermionic atoms into super-radiant phases [34][35][36][37][38] have been pointed out. In more complex setups such as multi-mode cavities [39][40][41][42][43][44][45] complex disordered structures, such as glasses or complex supersolids have been proposed.…”

Section: Introductionmentioning

confidence: 99%

Cavity-induced chiral states of fermionic quantum gases

2016

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We investigate ultra-cold fermions placed into an optical cavity and subjected to optical lattices which confine the atoms to ladder structures. A transverse running-wave laser beam induces together with the dynamical cavity field a two-photon Raman-assisted tunneling process with spatially dependent phase imprint along the rungs of the ladders. We identify the steady states which can occur by the feedback mechanism between the cavity field and the atoms. We find the spontaneous emergence of a finite cavity field amplitude which leads to an artificial magnetic field felt by the fermionic atoms. These form a chiral insulating or chiral liquid state carrying a chiral current. We explore the rich state diagram as a function of the power of the transverse laser beam, the atomic filling, and the phase imprint during the cavity-induced tunneling. Both a sudden onset or a slow exponential activation with the transverse laser power of the self-organized chiral states can occur.

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Triangular and honeycomb lattices of cold atoms in optical cavities

Cited by 18 publications

References 45 publications

Collective excitations and supersolid behavior of bosonic atoms inside two crossed optical cavities

Collective excitations and supersolid behavior of bosonic atoms inside two crossed optical cavities

Supersolid formation in a quantum gas breaking a continuous translational symmetry

Cavity-induced chiral states of fermionic quantum gases

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