Observation of a Degenerate Fermi Gas Trapped by a Bose-Einstein Condensate

DeSalvo, B. J.; Patel, Krutik; Johansen, Jacob; Chin, Cheng

doi:10.1103/physrevlett.119.233401

Cited by 65 publications

(83 citation statements)

References 55 publications

(52 reference statements)

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“…It would be interesting to investigate the effect of trapping fermions in this physical setup, in a similar spirit to the experiment of [47]. The ability to build larger systems of solitons with this particular system opens a novel avenue in studying lattices formed from solitary waves, with the twist that one can have different numbers of impurities present, which could be used to study effects analogous to condensed matter, for example a soliton-Hubbard model could be potentially explored, as well as understanding the generalized Toda lattice that this system would constitute.…”

Section: Discussionmentioning

confidence: 99%

“…Experimental work has studied the role that spin impurities have in the strongly correlated Tonks-Girardeau limit [42] and also magnetic spin models [43], which have also been the focus of subsequent theoretical investigations [44][45][46]. Complementary to this, recent experimental advances have led to the realization of trapping one matter-wave inside another, where a degenerate Fermi gas of 6 Li atoms was confined inside a 133 Cs Bose-Einstein condensate [47].The ability to both prepare and control ultracold gas experiments gives access to physical regimes that mimic and go beyond those associated with conventional condensed matter physics. Impurities play a central role in condensed matter, since most materials will contain some imperfections.…”

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confidence: 99%

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Coherent impurity transport in an attractive binary Bose–Einstein condensate

2019

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We study the dynamics of a soliton-impurity system modeled in terms of a binary Bose-Einstein condensate. This is achieved by 'switching off' one of the two self-interaction scattering lengths, giving a two component system where the second component is trapped entirely by the presence of the first component. It is shown that this system possesses rich dynamics, including the identification of unusual 'weak' dimers that appear close to the zero inter-component scattering length. It is further found that this system supports quasi-stable trimers in regimes where the equivalent single-component gas does not, which is attributed to the presence of the impurity atoms which can dynamically tunnel between the solitons, and maintain the required phase differences that support the trimer state. that the single component focussing nonlinear Schrödinger equation can possess chaotic solutions in the presence of an axial harmonic potential [29,30], as well as the observed interaction induced frequency shift of pairs of trapped bright solitons [31] in the experiment of [13]. Complementary to this, theoretical work has focussed on solitary waves in higher spin systems, revealing the existance of integrable points in the full parameter space of the spin-1 condensate, in the form of so-called 'polar' bright solitons [32,33]. Although solitons are usually studied as the solutions to one-dimensional nonlinear models, there have also been predictions of stable two-dimensional solitary wave solutions in dipolar Bose-Einstein condensates [34,35], where the additional nonlocal nonlinearity provides the stabilizing mechanism for these solitons. Very recently the Jones-Roberts soliton was realized experimentally, a true two-dimensional solitary wave structure [36].The realization of artificial electromagnetism with cold gases, and in particular spin-orbit coupling for Bose-Einstein condensates opens a novel route towards studying nonlinear wave structures. Here, the coupling of the condensates momentum to a quasi-spin leads to stripe-like soliton phases, related to the underlying immiscible phase of these systems [37,38]. Spin-orbit coupling forms a key ingredient in simulating more exotic scenarios, such as Dirac-like equations, where confined solutions have been predicted [39] that resemble their bright soliton cousins in single component condensates.Atomic condensates benefit from being exceptionally pure systems-this in turn allows one to investigate the effects of disorder and defects with an unprecedented level of control. The presence of impurities in ensembles of ultracold matter has led to predictions of impurity-molecules and lattices at the mean-field level [40], as well as the role of many-body correlations for a single impurity out-of-equilibrium [41]. Experimental work has studied the role that spin impurities have in the strongly correlated Tonks-Girardeau limit [42] and also magnetic spin models [43], which have also been the focus of subsequent theoretical investigations [44][45][46]. Complementary to this, recent exper...

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

Coherent impurity transport in an attractive binary Bose–Einstein condensate

2019

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“…Near resonance, in the quantum critical regime of the boson-impurity mixture, the very existence of a well-defined quasiparticle is in question [8,13,15,16]. Experimentally, evidence of Bose polaronic phenomena was observed in the expansion [43] and trapping [44] of fermions immersed in a BEC, through the phononic Lamb shift [45], and in the dynamics of impurities [46]. The continuum of excited states of impurities was probed in radiofrequency (rf) injection spectroscopy [16] on Bose-Fermi mixtures [47,48] and in a two-state mixture of bosons [49], yielding evidence for polaronic energy shifts of such excitations.…”

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confidence: 99%

Bose polarons near quantum criticality

Yan

Robens

et al. 2020

Science

232

164

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The emergence of quasiparticles in strongly interacting matter represents one of the cornerstones of modern physics. However, when different phases of matter compete near a quantum critical point, the very existence of quasiparticles comes under question. Here we create Bose polarons near quantum criticality by immersing atomic impurities in a Bose-Einstein condensate (BEC) with near-resonant interactions. Using locally-resolved radiofrequency spectroscopy, we probe the energy, spectral width, and short-range correlations of the impurities as a function of temperature. Far below the superfluid critical temperature, the impurities form well-defined quasiparticles. However, their inverse lifetime, given by their spectral width, is observed to increase linearly with temperature at the Planckian scale k B T , a hallmark of quantum critical behavior. Close to the BEC critical temperature, the spectral width exceeds the binding energy of the impurities, signaling a breakdown of the quasiparticle picture. arXiv:1904.02685v3 [cond-mat.quant-gas]

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“…Inter-particle interactions are controlled by two parameters g BB and g BF describing the strength of the contact intra-component 6 Li-23 Na [328], or 6 Li-133 Cs [329]. Second, it is assumed that both components experience the same external trapping potential.…”

Section: Bose-fermi Mixturesmentioning

confidence: 99%

One-dimensional mixtures of several ultracold atoms: a review

Sowiński¹,

2019

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Recent theoretical and experimental progress on studying one-dimensional systems of bosonic, fermionic, and Bose-Fermi mixtures of a few ultracold atoms confined in traps is reviewed in the broad context of mesoscopic quantum physics. We pay special attention to limiting cases of very strong or very weak interactions and transitions between them. For bosonic mixtures, we describe the developments in systems of three and four atoms as well as different extensions to larger numbers of particles. We also briefly review progress in the case of spinor Bose gases of a few atoms. For fermionic mixtures, we discuss a special role of spin and present a detailed discussion of the two-and three-atom cases. We discuss the advantages and disadvantages of different computation methods applied to systems with intermediate interactions. In the case of very strong repulsion, close to the infinite limit, we discuss approaches based on effective spin chain descriptions. We also report on recent studies on higherspin mixtures and inter-component attractive forces. For both statistics, we pay particular attention to impurity problems and mass imbalance cases. Finally, we describe the recent advances on trapped Bose-Fermi mixtures, which allow for a theoretical combination of previous concepts, well illustrating the importance of quantum statistics and inter-particle interactions. Lastly, we report on fundamental questions related to the subject which we believe will inspire further theoretical developments and experimental verification. :1903.12189v3 [cond-mat.quant-gas] CONTENTS arXiv

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Observation of a Degenerate Fermi Gas Trapped by a Bose-Einstein Condensate

Cited by 65 publications

References 55 publications

Coherent impurity transport in an attractive binary Bose–Einstein condensate

Coherent impurity transport in an attractive binary Bose–Einstein condensate

Bose polarons near quantum criticality

One-dimensional mixtures of several ultracold atoms: a review

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