Coherent Interaction of a Single Fermion with a Small Bosonic Field

Will, Sebastian; Best, Thorsten; Braun, Simon; Schneider, Ulrich; Bloch, Immanuel

doi:10.1103/physrevlett.106.115305

Cited by 81 publications

(166 citation statements)

References 25 publications

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“…For ultracold atomic mixtures, interspecies Feshbach resonances are used in the creation of ultracold polar molecules [3] and are required to observe heteronuclear Efimov trimer states [4]. They also allow the investigation of many interesting many-body phenomena in ultracold mixtures [5][6][7][8]. Since their first observation [9,10], interspecies Feshbach resonances have been studied in many experiments.…”

Section: Introductionmentioning

confidence: 99%

Feshbach spectroscopy and scattering properties of ultracold Li + Na mixtures

et al. 2012

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Section: Introductionmentioning

confidence: 99%

Feshbach spectroscopy and scattering properties of ultracold Li + Na mixtures

et al. 2012

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“…Quantum phase revival spectroscopy, based on the collapse and revival phenomenon, has been used to detect the presence of effective higher-body interactions [4,6]. Here we examine the influence of effective three-body interactions on the Bloch oscillations CR dynamics.…”

Section: Dephasing Mechanisms a Effective 3-body Interactionsmentioning

confidence: 99%

“…Furthermore, long coherence times, absence of impurities, and low dissipation make them an ideal system to observe non-equilibrium quantum dynamics [2,3]. One example is the observation of collapse and revival dynamics of bosonic matter wave coherence in a suddenly raised (quenched ) optical lattice [4][5][6]. Another example is the observation of Bloch oscillations, periodic motion in momentum and real space, of ultracold atoms in an accelerating potential [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Transport in two horizontal directions is suppressed. This system, which has been explored in several recent experiments [4][5][6], is ideally suited for studying the interplay between particle-particle interactions and Bloch oscillations physics. We consider a quench scenario where, starting from an initial superfluid state, the lattice depth is suddenly increased so that tunneling is suppressed, the atom density frozen, and we are in the strong field regime F J, where F and J are the gravitational potential energy difference and tunneling energy between two neighboring lattice sites, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Bloch oscillations and quench dynamics of interacting bosons in an optical lattice

et al. 2014

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We study the dynamics of interacting superfluid bosons in a one dimensional vertical optical lattice after a sudden increase of the lattice potential depth. We show that this system can be exploited to investigate the effects of strong interactions on Bloch oscillations. We perform theoretical modelling of this system, identify experimental challenges and explore a new regime of Bloch oscillations characterized by interaction-induced matter-wave collapse and revivals which modify the Bloch oscillations dynamics. In addition, we study three dephasing mechanisms: effective three-body interactions, finite value of tunneling, and a background harmonic potential. We also find that the center of mass motion in the presence of finite tunneling goes through collapse and revivals, giving an example of quantum transport where interaction-induced revivals are important. We quantify the effects of residual harmonic trapping on the momentum distribution dynamics and show the occurrence of interaction-modified temporal Talbot effect. Finally, we analyze the prospects and challenges of exploiting Bloch oscillations of cold atoms in the strongly-interacting regime for precision measurement of the gravitational acceleration g.

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“…Since at these energy scales often all degrees of freedom other than the positions can be ignored, they provide a simple system which still shows a great diversity of phenomena [1,2]. Experimentally, the loading of a small number of fermionic or bosonic atoms into a single trap has been achieved [3], and mixtures have been realized in optical lattice potentials [4]. Also, the strongly correlated low-dimensional Tonks-Girardeau (TG) gas has been achieved experimentally, which also requires low densities [5].…”

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confidence: 99%

Sharp crossover from composite fermionization to phase separation in microscopic mixtures of ultracold bosons

et al. 2013

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We show that a two-component mixture of a few repulsively interacting ultracold atoms in a one-dimensional trap possesses very diverse quantum regimes and that the crossover between them can be induced by tuning the interactions in one of the species. Starting from the composite fermionization regime, in which the interactions between both components are large and neither gas is phase coherent, our results show that a phase-separated state can be reached by increasing the interaction in one of the species. In this regime, the weakly interacting component stays at the center of the trap and becomes almost fully phase coherent, while the strongly interacting one is expelled to the edges of the trap. The crossover is sharp, as can be witnessed in the system's energy and in the occupation of the lowest natural orbital of the weakly interacting species. We show that such a transition is a few-atom effect which disappears for a large population imbalance. Ensembles of a few interacting ultracold trapped atoms constitute unique quantum systems. They can be exceptionally well isolated from the environment, minimizing the role of decoherence, and are perfect candidates for the study of states with strong quantum correlations. Moreover, they are extremely versatile, as precise control over the shape of the trapping potential and the atom-atom interactions is routinely available in current experiments. Since at these energy scales often all degrees of freedom other than the positions can be ignored, they provide a simple system which still shows a great diversity of phenomena [1,2]. Experimentally, the loading of a small number of fermionic or bosonic atoms into a single trap has been achieved [3], and mixtures have been realized in optical lattice potentials [4]. Also, the strongly correlated low-dimensional Tonks-Girardeau (TG) gas has been achieved experimentally, which also requires low densities [5]. These systems constitute a natural ground for studies of squeezing and entanglement, with applications, for example, in precision measurements [6,7], thus leading to the great interest in their experimental realization.In this article, we predict a sharp crossover between two very different regimes in microscopic, two-component mixtures of repulsively interacting bosons at zero temperature, corresponding to different interaction strengths between atoms of the same and different species when trapped in a onedimensional (1D) trap. In the first regime the interactions between the atoms of different species are strong, while the interactions between the atoms of the same species are weak. This is the so-called composite fermionization limit [8,9], which shows strong anticorrelations between unlike atoms, similar to the ones between like atoms in the standard TG gas [10]. Since the occupation number of the lowest natural orbital for each species, A and B, scales more rapidly than N A,B but more slowly than N A,B , neither of them is fully Bose * magarciamarch@ecm.ub.edu condensed. The second limit is obtained when the interact...

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Coherent Interaction of a Single Fermion with a Small Bosonic Field

Cited by 81 publications

References 25 publications

Feshbach spectroscopy and scattering properties of ultracold Li + Na mixtures

Feshbach spectroscopy and scattering properties of ultracold Li + Na mixtures

Bloch oscillations and quench dynamics of interacting bosons in an optical lattice

Sharp crossover from composite fermionization to phase separation in microscopic mixtures of ultracold bosons

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