Dual-species Bose-Einstein condensate of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Rb</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>87</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Cs</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>133</mml:mn></mml:mrow></mml:mmultiscripts></mml:ma

McCarron, Daniel; Cho, H. W.; Jenkin, D. L.; Köppinger, Michael P.; Cornish, Simon L.

doi:10.1103/physreva.84.011603

Cited by 245 publications

(281 citation statements)

References 42 publications

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“…Population imbalanced dilute mixtures of degenerate ultracold atoms, either Bose-Fermi [83][84][85][86][87][88] or Bose-Bose [89][90][91][92][93][94] mixtures, in which the role of the majority many-body environment is played by bosons, are the ideal settings in which to explore this rich physics. We require sufficiently low temperatures for which the bosonic environment will condense and can be modeled as a weakly interacting BEC.…”

Section: Discussionmentioning

confidence: 99%

Radio-frequency spectroscopy of polarons in ultracold Bose gases

Shashi¹,

Grusdt²,

Abanin³

et al. 2014

Phys. Rev. A

108

182

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Recent experimental advances enabled the realization of mobile impurities immersed in a Bose-Einstein condensate (BEC) of ultracold atoms. Here, we consider impurities with two or more internal hyperfine states, and study their radio-frequency (rf) absorption spectra, which correspond to transitions between two different hyperfine states. We calculate rf spectra for the case when one of the hyperfine states involved interacts with the BEC, while the other state is noninteracting, by performing a nonperturbative resummation of the probabilities of exciting different numbers of phonon modes. In the presence of interactions, the impurity gets dressed by Bogoliubov excitations of the BEC, and forms a polaron. The rf signal contains a δ-function peak centered at the energy of the polaron measured relative to the bare impurity transition frequency with a weight equal to the amount of bare impurity character in the polaron state. The rf spectrum also has a broad incoherent part arising from the background excitations of the BEC, with a characteristic power-law tail that appears as a consequence of the universal physics of contact interactions. We discuss both the direct rf measurement, in which the impurity is initially in an interacting state, and the inverse rf measurement, in which the impurity is initially in a noninteracting state. In the latter case, in order to calculate the rf spectrum, we solve the problem of polaron formation: a mobile impurity is suddenly introduced in a BEC, and dynamically gets dressed by Bogoliubov phonons. Our solution is based on a time-dependent variational ansatz of coherent states of Bogoliubov phonons, which becomes exact when the impurity is localized. Moreover, we show that such an ansatz compares well with a semiclassical estimate of the propagation amplitude of a mobile impurity in the BEC. Our technique can be extended to cases when both initial and final impurity states are interacting with the BEC.

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Section: Discussionmentioning

confidence: 99%

Radio-frequency spectroscopy of polarons in ultracold Bose gases

Shashi¹,

Grusdt²,

Abanin³

et al. 2014

Phys. Rev. A

108

182

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“…Ultracold spinor [1][2][3][4][5][6][7][8][9][10] and multi-component [11][12][13][14][15][16][17][18] Bose gases have been experimentally studied in regimes where an understanding of dissipative and thermal dynamics is necessary. For example: (i) The relaxation dynamics of metastable states arising from the immiscibility of components in a spin-1 sodium condensate [19]; (ii) Energy damping observed in the spin oscillation dynamics of a spinor condensate [5], empirically described by an ohmic-like dissipation term; (iii) Condensation and magnetisation formation dynamics in a gas suddenly cooled to below the condensation temperature [20,21].…”

Section: Introductionmentioning

confidence: 99%

Stochastic projected Gross-Pitaevskii equation for spinor and multicomponent condensates

Bradley

Blakie

2014

Phys. Rev. A

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A stochastic Gross-Pitaevskii equation is derived for partially condensed Bose gas systems subject to binary contact interactions. The theory we present provides a classical-field theory suitable for describing dissipative dynamics and phase transitions of spinor and multi-component Bose gas systems comprised of an arbitrary number of distinct interacting Bose fields. A new class of dissipative processes involving distinguishable particle interchange between coherent and incoherent regions of phase-space is identified. The formalism and its implications are illustrated for two-component mixtures and spin-1 Bose-Einstein condensates. For systems comprised of atoms of equal mass, with thermal reservoirs that are close to equilibrium, the dissipation rates of the theory are reduced to analytical expressions that may be readily evaluated. The unified treatment of binary contact interactions presented here provides a theory with broad relevance for quasi-equilibrium and far-from-equilibrium Bose-Einstein condensates.

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“…There has been considerable work on the Feshbach resonances [15] and molecule formation [16,17] in 87 Rb 133 Cs. However, this isotopologue has an interspecies background scattering length that is large and positive, which produces a spatial separation of the dual condensate [18] and enhances losses from three-body collisions [19,20]. Both of these factors inhibit the formation of weakly bound Feshbach molecules.…”

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confidence: 99%

“…Details of our apparatus have been described previously in the context of our work on dual-species condensates of 87 Rb and 133 Cs [18,19]. Ultracold mixtures of 85 Rb and 133 Cs are collected in a two-species magneto-optical trap.…”

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confidence: 99%