Self-Organization Threshold Scaling for Thermal Atoms Coupled to a Cavity

Arnold, K. J.; Baden, M. P.; Barrett, M. D.

doi:10.1103/physrevlett.109.153002

Cited by 73 publications

(74 citation statements)

References 16 publications

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“…To achieve homogeneous pumping of the BEC and to minimize any perturbation to the BEC trap potentials, the transverse pump has a large waist (1=e field radius) of 500 μm. In contrast to the standing-wave pump configuration used in previous studies of cavity-induced self-organization [28,46], we employ a running-wave pump [29] in the data taken in Figs. 2, 3, 5, and 7.…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…Atomic gases placed in transversely pumped optical cavities have been shown to undergo a superradiant, self-organization transition arising from the competition between their free-particle dispersion and cavity-mediated interactions [28][29][30][31]35]. Figure 1 shows examples of transversely pumped cavities.…”

Section: Photon-mediated Interactions In a Multimode Cavitymentioning

confidence: 99%

“…[27]. Several groups have explored the superradiant, selforganization phase transition with thermal atoms or BECs in single-mode cavities [28][29][30]. Previous work with multimode cavities explored this phase transition with thermal atoms, though without attention to the character of the photonmediated interactions among the atoms [31].…”

Section: Introductionmentioning

confidence: 99%

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Tunable-Range, Photon-Mediated Atomic Interactions in Multimode Cavity QED

et al. 2018

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Optical cavity QED provides a platform with which to explore quantum many-body physics in drivendissipative systems. Single-mode cavities provide strong, infinite-range photon-mediated interactions among intracavity atoms. However, these global all-to-all couplings are limiting from the perspective of exploring quantum many-body physics beyond the mean-field approximation. The present work demonstrates that local couplings can be created using multimode cavity QED. This is established through measurements of the threshold of a superradiant, self-organization phase transition versus atomic position. Specifically, we experimentally show that the interference of near-degenerate cavity modes leads to both a strong and tunable-range interaction between Bose-Einstein condensates (BECs) trapped within the cavity. We exploit the symmetry of a confocal cavity to measure the interaction between real BECs and their virtual images without unwanted contributions arising from the merger of real BECs. Atom-atom coupling may be tuned from short range to long range. This capability paves the way toward future explorations of exotic, strongly correlated systems such as quantum liquid crystals and driven-dissipative spin glasses.

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Section: Experimental Apparatusmentioning

confidence: 99%

Section: Photon-mediated Interactions In a Multimode Cavitymentioning

confidence: 99%

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Tunable-Range, Photon-Mediated Atomic Interactions in Multimode Cavity QED

et al. 2018

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“…When ultracold polarizable particles in an optical resonator are coherently illuminated from the side at sufficient intensity, the system undergoes a transition from homogeneous to crystalline order accompanied by superradiant light scattering into the cavity mode [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Self-ordering dynamics of ultracold atoms in multicolored cavity fields

Krämer

Ritsch

2014

Phys. Rev. A

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We study light induced spatial crystallization of ultracold quantum particles confined along the axis of a high-Q linear cavity via a transverse multicolor pump using numerical simulations.Whenever a pump frequency is tuned close to resonance with a longitudinal cavity mode, the dynamics favors bistable spatial particle ordering into a Bragg grating at a wavelength distance.Simultaneous pumping at several resonant frequencies fosters competition between the different spatial lattice orders, exhibiting complex nonlinear field dynamics involving several metastable atom-field states. For few particles even superpositions of different spatial orders entangled with different light mode amplitudes appear. By a proper choice of trap geometry and pump frequencies a broad variety of many particle Hamiltonians with a nontrivial long range coupling can be emulated in such a setup. When applying quantum Monte Carlo wave function simulations to study time evolution we find simultaneous super radiant scattering into several light modes and the buildup of strong non-classical atom field correlations.

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“…In a high-finesse cavity the effect is significantly enhanced due to the strong coupling one can achieve between atoms and light at the single photon level. Here, spatial ordering [5][6][7][8], collective-atom recoil lasing [9,10], synchronization [11], and motion-induced bistability [12][13][14][15] have been observed in gases of laser-cooled atoms inside a high-finesse cavity, when either the cavity or the atoms are driven by an external laser. These phenomena typically occur when the laser intensity exceeds a threshold value and can be revealed by the light transmitted by the resonator's mirrors.…”

Section: Introductionmentioning

confidence: 99%

Quantum phases of incommensurate optical lattices due to cavity backaction

et al. 2013

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Ultracold bosonic atoms are confined by an optical lattice inside an optical resonator and interact with a cavity mode, whose wave length is incommensurate with the spatial periodicity of the confining potential. We predict that the intracavity photon number can be significantly different from zero when the atoms are driven by a transverse laser whose intensity exceeds a threshold value and whose frequency is suitably detuned from the cavity and the atomic transition frequency. In this parameter regime the atoms form clusters in which they emit in phase into the cavity. The clusters are phase locked, thereby maximizing the intracavity photon number. These predictions are based on a Bose-Hubbard model, whose derivation is here reported in detail. The BoseHubbard Hamiltonian has coefficients which are due to the cavity field and depend on the atomic density at all lattice sites. The corresponding phase diagram is evaluated using Quantum Monte Carlo simulations in onedimension and mean-field calculations in two dimensions. Where the intracavity photon number is large, the ground state of the atomic gas lacks superfluidity and possesses finite compressibility, typical of a Bose-glass.

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Self-Organization Threshold Scaling for Thermal Atoms Coupled to a Cavity

Cited by 73 publications

References 16 publications

Tunable-Range, Photon-Mediated Atomic Interactions in Multimode Cavity QED

Tunable-Range, Photon-Mediated Atomic Interactions in Multimode Cavity QED

Self-ordering dynamics of ultracold atoms in multicolored cavity fields

Quantum phases of incommensurate optical lattices due to cavity backaction

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