Motional Coherence of Fermions Immersed in a Bose Gas

Scelle, R.; Rentrop, T.; Trautmann, A.; Schuster, Tobias; Oberthaler, Markus K.

doi:10.1103/physrevlett.111.070401

Cited by 122 publications

(170 citation statements)

References 28 publications

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“…Such mixtures have been used to study Efimov physics [13][14][15], probe impurities in Bose gases [16], and entropically cool gases confined in an optical lattice [17]. Pairs of atoms in the mixtures can be combined using magnetically or optically tunable Feshbach resonances to create ultracold molecules [18][19][20][21][22][23][24][25][26].…”

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confidence: 99%

Interspecies thermalization in an ultracold mixture of Cs and Yb in an optical trap

et al. 2017

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We present measurements of interspecies thermalization between ultracold samples of 133 Cs and either 174 Yb or 170 Yb. The two species are trapped in a far-off-resonance optical dipole trap and 133 Cs is sympathetically cooled by Yb. We extract effective interspecies thermalization cross sections by fitting the thermalization measurements to a kinetic model, giving σ Cs 174 Yb = (5 ± 2) × 10 −13 cm 2 and σ Cs 170 Yb = (18 ± 8) × 10 −13 cm 2 . We perform quantum scattering calculations of the thermalization cross sections and optimize the CsYb interaction potential to reproduce the measurements. We predict scattering lengths for all isotopic combinations of Cs and Yb. We also demonstrate the independent production of 174 Yb and 133 Cs Bose-Einstein condensates using the same optical dipole trap, an important step towards the realization of a quantum-degenerate mixture of the two species.The realization of ultracold atomic mixtures [1][2][3][4][5][6][7][8][9][10][11][12] has opened up the possibility of exploring new regimes of few-and many-body physics. Such mixtures have been used to study Efimov physics [13][14][15], probe impurities in Bose gases [16], and entropically cool gases confined in an optical lattice [17]. Pairs of atoms in the mixtures can be combined using magnetically or optically tunable Feshbach resonances to create ultracold molecules [18][19][20][21][22][23][24][25][26]. These ultracold molecules have a wealth of applications, such as tests of fundamental physics [27][28][29], realization of novel phase transitions [30][31][32], and the study of ultracold chemistry [33,34]. In addition, the long-range dipole-dipole interactions present between pairs of polar molecules make them useful in the study of dipolar quantum matter [35,36] and ultracold molecules confined in an optical lattice can simulate a variety of condensedmatter systems [37][38][39].Although the large majority of work on ultracold molecules has focused on bi-alkali systems, there is burgeoning interest in pairing alkali-metal atoms with divalent atoms such as Yb [40][41][42][43][44][45] or Sr [46]. The heteronuclear 2 Σ molecules formed in these systems have both an electric and a magnetic dipole moment in the ground electronic state. The extra magnetic degree of freedom opens up new possibilities for simulating a range of Hamiltonians for spins interacting on a lattice and for topologically protected quantum information processing [47].One of the challenging aspects of creating molecules in these systems is that the Feshbach resonances tend to be narrow and sparse. They are narrow because the main coupling responsible for them is the weak distance dependence of the alkali-metal hyperfine coupling, caused by the spin-singlet atom at short range [48] [48,49], and for some systems may be at impractically high magnetic fields. Amongst the various alkali-Yb combinations, CsYb has been proposed as the most favorable candidate because the high mass of Cs facilitates a higher density of bound states near threshold and its large hyperfi...

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confidence: 99%

Interspecies thermalization in an ultracold mixture of Cs and Yb in an optical trap

et al. 2017

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“…Here we should mention that experimental observations of motional coherence of trapped impurity atoms in the two lowest energy levels, in both the presence and the absence of the BEC background, has recently been achieved by motional Ramsey spectroscopy [31], which leads to the energy shift of the trapped impurity due to coupling with the BEC background, i.e., "phononic Lamb shift", for a weakly coupled impurity-boson interaction [47]. In analyzing this experimental result, Bogoliubov phonons of the BEC in free space and impurities trapped only in a single dimension were used.…”

Section: A Mean-field Energy and Interaction Energymentioning

confidence: 99%

“…Examples include studies on Bose-Einstein condensate (BEC) and Fermi polarons that are impurity atoms immersed in Bose-Einstein condensed atoms [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] and degenerate Fermi atoms [21][22][23][24][25][26][27][28], respectively, as well as on polarons in optical lattices [29]. Experimental realizations of BEC polarons were achieved first in a weak coupling regime [30][31][32]. Then, recent experiments in a strong coupling regime around the unitary limit have observed a behavior of the binding energy between an impurity and excited bosons in the BEC via radio frequency (RF) spectroscopy and in-situ imaging technology [33,34].…”

Section: Introductionmentioning

confidence: 99%

Bose-Einstein-condensate polaron in harmonic trap potentials in the weak-coupling regime: Lee-Low-Pines–type approach

2017

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We have calculated the zero-temperature binding energy of a single impurity atom immersed in a Bose-Einstein condensate (BEC) of ultracold atoms. The impurity and the condensed atoms are trapped in the respective axially symmetric harmonic potentials, where the impurity interacts with bosonic atoms in the condensate via low-energy s-wave scattering. In this case, bosons are excited around the impurity to form a quasiparticle, namely, a BEC polaron. We have developed a variational method, a la Lee-Low-Pines (LLP), for description of the polaron that has a conserved angular momentum around the symmetric axis. We find from numerical results that the binding between the impurity and the excited bosons breaks the degeneracy of the impurity energy with respect to the total angular momentum of the polaron. The angular momentum is partially shared by the excited bosons in a manner that is similar to the drag effect on the polaron momentum by a phonon cloud in the LLP theory for the electron-phonon system. * Electronic address: e.nakano@kochi-u.ac.jp

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“…bidium atoms in a 1D optical lattice was initially realized in [7], and the loading of different atoms can be using a species-selective optical lattice [25,26]. Here we assume the atoms of species A and B are alternatively arranged in the lattice sites with a filling factor of one atom per site and the hopping of an atom into an adjacent filled site is forbidden by the deep depth of the lattice.…”

Section: Scheme and Master Equationmentioning

confidence: 99%

Dynamical phases in a one-dimensional chain of heterospecies Rydberg atoms with next-nearest-neighbor interactions

et al. 2015

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We theoretically investigate the dynamical phase diagram of a one-dimensional chain of laserexcited two-species Rydberg atoms. The existence of a variety of unique dynamical phases in the experimentally-achievable parameter region is predicted under the mean-field approximation, and the change of those phases when the effect of the next-nearest neighbor interaction is included is further discussed. In particular we find the competition of the strong Rydberg-Rydberg interactions and the optical excitation imbalance can lead to the presence of complex multiple chaotic phases, which are highly sensitive to the initial Rydberg-state population and the strength of the nextnearest neighbor interactions.

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Motional Coherence of Fermions Immersed in a Bose Gas

Cited by 122 publications

References 28 publications

Interspecies thermalization in an ultracold mixture of Cs and Yb in an optical trap

Interspecies thermalization in an ultracold mixture of Cs and Yb in an optical trap

Bose-Einstein-condensate polaron in harmonic trap potentials in the weak-coupling regime: Lee-Low-Pines–type approach

Dynamical phases in a one-dimensional chain of heterospecies Rydberg atoms with next-nearest-neighbor interactions

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