Dispersion of the dielectric permittivity of dense and cold atomic gases

Fofanov, Ya. A.; Kuraptsev, A. S.; Sokolov, I. M.; Havey, M. D.

doi:10.1103/physreva.84.053811

Cited by 55 publications

(10 citation statements)

References 53 publications

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“…This condition is thus similar to the so-called Ioffe-Regel criterion of Anderson localization [3]. In this density regime, it has been shown that the effective dielectric permittivity can be negative [16]. The decrease of the elastic mean free path due to recurrent scattering has been discussed in Refs.…”

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confidence: 62%

Polaritonic modes in a dense cloud of cold atoms

et al. 2016

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We analyze resonant light scattering by a cloud of cold atoms with randomly distributed positions in a regime where near-field interactions between scatterers cannot be neglected. Using a microscopic approach we calculate numerically the collective eigenmodes of the cloud for many realizations. It is found that there always exists a small number of polaritonic modes. Using a macroscopic approach, we show that the atomic cloud is equivalent to a dielectric particle with an effective permittivity, and that there is a one-to-one correspondence between the microscopic polaritonic modes and the modes of the dielectric particle.

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confidence: 62%

Polaritonic modes in a dense cloud of cold atoms

et al. 2016

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“…The theoretical approach used has been described elsewhere [43,61,64,65,67], and for the convenience of the reader is summarized in the Appendix. To have possibilities of contrasting the results of the theory with experiments, we choose the density of our motionless four-level atoms in such a way that photons will have the same mean free path as in the 87 Rb samples.…”

Section: B Detuning Dependencementioning

confidence: 99%

Near-resonance light scattering from a high-density ultracold atomic87Rb gas

et al. 2013

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We report a combined experimental and theoretical investigation of near-resonance light scattering from a high-density and ultracold atomic 87 Rb gas. The atomic sample, having a peak density ∼5 × 10 13 atoms/cm 3 , temperature ∼65 μK, and initially prepared in the F = 1 lower-energy 87 Rb hyperfine component, is optically pumped to the higher-energy F = 2 hyperfine level. Measurements are made of the transient hyperfine pumping process and of the time evolution of scattering of near-resonance probe radiation on the F = 2 → F = 3 transition. Features of the density, detuning, and temporal dependence of the signals are attributed to the high density and consequent large optical depth of the samples.

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“…A natural place to study strong dipole-dipole interactions is in cold atom systems, where a high level of control of the interaction strength and atom spacing is possible. Much work has already been carried out on theoretical understanding of light scattering through cold atom gases [5][6][7][8][9][10] with some of these effects being realised experimentally [11,12]. Most work focuses on the low light intensity limit, where interactions between excitations is negligible and the full quantum model simplifies to a problem of classical scatterers.…”

Section: Introductionmentioning

confidence: 99%

Phases of driven two-level systems with nonlocal dissipation

Parmee

Cooper

2018

Phys. Rev. A

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We study an array of two-level systems arranged on a lattice and illuminated by an external plane wave which drives a dipolar transition between the two energy levels. In this set up, the two-level systems are coupled by dipolar interactions and subject to nonlocal dissipation, so behave as an open many-body quantum system. We investigate the long-time dynamics of the system at the mean-field level, and use this to determine a phase diagram as a function of external drive and detuning. We find a multitude of phases including antiferromagnetism, spin density waves, oscillations and phase bistabilities. We investigate these phases in more detail and explain how nonlocal dissipation plays a role in the long-time dynamics. Furthermore, we discuss what features would survive in the full quantum description.

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Dispersion of the dielectric permittivity of dense and cold atomic gases

Cited by 55 publications

References 53 publications

Polaritonic modes in a dense cloud of cold atoms

Polaritonic modes in a dense cloud of cold atoms

Near-resonance light scattering from a high-density ultracold atomic87Rb gas

Phases of driven two-level systems with nonlocal dissipation

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