Inserting single Cs atoms into an ultracold Rb gas

Spethmann, Nicolas; Kindermann, Farina; John, Shincy; Weber, C.; Meschede, Dieter; Widera, Artur

doi:10.1007/s00340-011-4868-6

Cited by 17 publications

(24 citation statements)

References 22 publications

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“…Here l r = /(m B ω r ) and l Ir = /(m I ω Ir ) denote the oscillator lengths in radial direction for BEC and impurity. For the experimentally realistic trap frequencies ω r = ω Ir = 2π × 0.179 kHz ω z = ω Iz = 2π × 0.050 kHz [18] these radial oscillator lengths amount to the values l r = 15190.8 a 0 and l Ir = 12279.0 a 0 for BEC and impurity, respectively. In order to distinguish between the weakly interacting quasi-1D and the strongly interacting Tonks-Girardeau regime, Petrov et al [26] introduced a dimensionless quantity which involves both the longitudinal and the transversal trap size as well as the scattering length:…”

Section: Discussionmentioning

confidence: 98%

Numerical study of localized impurity in a Bose-Einstein condensate

Akram

Pelster

2016

Phys. Rev. A

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Motivated by recent experiments, we investigate a single $^{133}\text{Cs}$ impurity in the center of a trapped $^{87}\text{Rb}$ Bose-Einstein condensate. Within a zero-temperature mean-field description we provide a one-dimensional physical intuitive model which involves two coupled differential equations for the condensate and the impurity wave function, which we solve numerically. With this we determine within the equilibrium phase diagram spanned by the intra- and inter-species coupling strength, whether the impurity is localized at the trap center or expelled to the condensate border. In the former case we find that the impurity induces a bump or dip on the condensate for an attractive or a repulsive Rb-Cs interaction strength, respectively. Conversely, the condensate environment leads to an effective mass of the impurity which increases quadratically for small interspecies interaction strength. Afterwards, we investigate how the impurity imprint upon the condensate wave function evolves for two quench scenarios. At first we consider the case that the harmonic confinement is released. During the resulting time-of-flight expansion it turns out that the impurity-induced bump in the condensate wave function starts decaying marginally, whereas the dip decays with a characteristic time scale which decreases with increasing repulsive impurity-BEC interaction strength. Secondly, once the attractive or repulsive interspecies coupling constant is switched off, we find that white-shock waves or bi-solitons emerge which both oscillate within the harmonic confinement with a characteristic frequency.Comment: arXiv admin note: text overlap with arXiv:1508.0548

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Section: Discussionmentioning

confidence: 98%

Numerical study of localized impurity in a Bose-Einstein condensate

Akram

Pelster

2016

Phys. Rev. A

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“…After it has been sufficiently cooled down to be well localized in the dipole trap crossing region, the Cs MOT is switched on. To avoid immediate losses of the single Cs atoms due to light-induced collisions [38][39][40], both species are trapped in different traps with a displacement of 110 µm. Figure II As an initial step towards immersing the Cs atoms into the Rb BEC, we immerse them into a thermal Rb gas.…”

Section: Combining Single Atoms With the Quantum Gasmentioning

confidence: 99%

Neutral impurities in a Bose-Einstein condensate for simulation of the Fröhlich-polaron

Hohmann

Kindermann

Gänger

et al. 2015

EPJ Quantum Technol.

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We present an experimental system to study the Bose polaron by immersion of single, wellcontrollable neutral Cs impurities into a Rb Bose-Einstein condensate (BEC). We show that, by proper optical traps, independent control over impurity and BEC allows for precision relative positioning of the two sub-systems as well as for independent read-out. We furthermore estimate that measuring the polaron binding energy of Fröhlich-type Bose polarons in the low and intermediate coupling regime is feasible with our experimental constraints and limitations discussed.

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“…the magnetic trap. The Innsbruck [16] and Bonn [17] groups have placed 133 Cs impurities in a BEC of 87 Rb, and magnetically tuned their mutual scattering length with a Feshbach resonance. The Florence group [18] created mixtures of 41 K and 87 Rb, and manipulated the two components with species-selective optical potentials.…”

Section: Introductionmentioning

confidence: 99%

Quantum impurities: from mobile Josephson junctions to depletons

2016

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We overview the main features of mobile impurities moving in one-dimensional superfluid backgrounds by modeling it as a mobile Josephson junction, which leads naturally to the periodic dispersion of the impurity. The dissipation processes, such as radiative friction and quantum viscosity, are shown to result from the interaction of the collective phase difference with the background phonons. We develop a more realistic depleton model of an impurity-hole bound state that provides a number of exact results interpolating between the semiclassical weakly interacting picture and the strongly interacting Tonks-Girardeau regime. We also discuss the physics of a trapped impurity, relevant to current experiments with ultra cold atoms. Recently the field has received growing attention due to advances in cold atom experiments. Through a number of techniques it became possible to place various impurity atoms in Bose-Einstein condensates (BEC) of alkali atoms, manipulate their mutual scattering strength and apply forces selectively to the impurity atoms. The Cambridge group [15] has used microwave pulses to flip the hyperfine state of a few spatially localized atoms in the BEC of magnetically levitated 87 Rb, turning them into mobile impurities. The impurities, created in the hyperfine m F =0 state, were then accelerated through the BEC by the gravitational force, not compensated by

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Inserting single Cs atoms into an ultracold Rb gas

Cited by 17 publications

References 22 publications

Numerical study of localized impurity in a Bose-Einstein condensate

Numerical study of localized impurity in a Bose-Einstein condensate

Neutral impurities in a Bose-Einstein condensate for simulation of the Fröhlich-polaron

Quantum impurities: from mobile Josephson junctions to depletons

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