Interaction Control and Bright Solitons in Coherently Coupled Bose-Einstein Condensates

Sanz, Jorge Luciano Alió; Frölian, A.; Chisholm, C. S.; Cabrera, Cesar R.; Tarruell, Leticia

doi:10.1103/physrevlett.128.013201

Cited by 22 publications

(10 citation statements)

References 47 publications

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“…Mobile impurities can be injected in atomic quantum gases, by exploiting controlled transfer between different atomic internal states [4]. In this context, both inter-species and intra-species interactions can be tuned by means of Feshbach resonances [43,[74][75][76]; atomic mixtures with controllable imbalance can be prepared [77]; lattices of various geometries can be designed [78]; and polaron spectra can be obtained through RF spectroscopy [4,79] and (momentum-resolved) Raman spectroscopy [80]. By manipulating small ensembles of atoms [41,42], these systems could explore the extrapolation between the ED results presented in this work and their thermodynamic limit.…”

Section: Discussionmentioning

confidence: 99%

Polaron spectroscopy of interacting Fermi systems: Insights from exact diagonalization

Amelio,

Goldman

2024

SciPost Phys.

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Immersing a mobile impurity into a many-body quantum system represents a theoretically intriguing and experimentally effective way of probing its properties. In this work, we study the polaron spectral function in various environments, within the framework of Fermi-Hubbard models. Inspired by possible realizations in cold atoms and semiconductor heterostructures, we consider different configurations for the background Fermi gas, including charge density waves, multiple Fermi seas and pair superfluids. While our calculations are performed using an exact-diagonalization approach, hence limiting our analysis to systems of few interacting Fermi particles, we identify robust spectral features supported by theoretical results. Our work provides a benchmark for computations based on mean-field approaches and reveal surprising features of polaron spectra, inspiring new theoretical investigations.

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Section: Discussionmentioning

confidence: 99%

Polaron spectroscopy of interacting Fermi systems: Insights from exact diagonalization

Amelio,

Goldman

2024

SciPost Phys.

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“…Notably, the state-of-the-art technology allows the depth of an optical lattice to be arbitrarily tuned by changing the laser intensities, enabling realizations of quasi-1D [6] and quasi-2D [7,8] BECs. [36] has demonstrated fast control of the interatomic interactions by coherently coupling two atomic states with intra-and interstate scattering lengths almost at will. Furthermore, the beyond-mean-field equation of the state of a Rabicoupled two-component has been experimentally measured by [19].…”

Section: Discussionmentioning

confidence: 99%

Dimensional crossover of a Rabi-coupled two-component Bose–Einstein condensate in an optical lattice

Li¹,

Liang²

2022

Commun. Theor. Phys.

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Dimensionality is a central concept in developing the theory of low-dimensional physics. However, previous research on dimensional crossover in the context of Bose-Einstein condensate (BEC) has focused on the single-component BEC. To our best knowledge, further consideration of the two-component internal degrees of freedom on the effects of dimensional crossover is still lacking. In this work, we are motivated to investigate the dimensional crossover in a three-dimensional (3D) Rabi-coupled two-component BEC. The spin degrees of freedom consists of the Rabi-like and inter- and intra- interaction coupling constants. The dimensional crossovers from 3D to 2D or 1D are controlled by the continuous increase of 1D or 2D lattice depth respectively. Then we analyze how the dimensionality of the model system combined with spin degree of freedom can affect quantum fluctuations. Accordingly, the analytical expressions of the ground-state energy and quantum depletion of the system are obtained. Our results show that the dimensional crossover induces a characteristic 3D to quasi-2D or 1D crossover in the behavior of quantum fluctuations, with the emphasis on the separated effects of Rabi-like and inter- and intra- interaction coupling constants on the quantum fluctuations. Conditions for possible experimental realization of our scenario are also discussed.

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“…MI has been observed in the counterflow dynamics of two-component BECs in the miscible (purely repulsive) phase [22]. Also, a recent experiment with coherently coupled BECs rapidly quenched into the attractive regime reported the creation of bright soliton trains formed by dressed-state atoms [26].…”

Section: Introductionmentioning

confidence: 97%

Soliton trains after interaction quenches in Bose mixtures

Cidrim,

Salasnich,

Macrì

2020

Preprint

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We investigate the quench dynamics of a two-component Bose mixture and study the onset of modulational instability, which leads the system far from equilibrium. Analogous to the single-component counterpart, this phenomenon results in the creation of trains of bright solitons. We provide an analytical estimate of the number of solitons at long times after the quench for each of the two components based on the most unstable mode of the Bogoliubov spectrum, which agrees well with our simulations for quenches to the weak attractive regime when the two components possess equal intraspecies interactions and loss rates. We also explain the significantly different soliton dynamics in a realistic experimental homonuclear potassium mixture in terms of different intraspecies interaction and loss rates. We investigate the quench dynamics of the particle number of each component estimating the characteristic time for the appearance of modulational instability for a variety of interaction strengths and loss rates. Finally, we evaluate the influence of the beyond-mean-field contribution, which is crucial for the ground-state properties of the mixture, in the quench dynamics for both the evolution of the particle number and the radial width of the mixture. In particular, even for quenches to strongly attractive effective interactions, we do not observe the dynamical formation of solitonic droplets.

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Interaction Control and Bright Solitons in Coherently Coupled Bose-Einstein Condensates

Cited by 22 publications

References 47 publications

Polaron spectroscopy of interacting Fermi systems: Insights from exact diagonalization

Polaron spectroscopy of interacting Fermi systems: Insights from exact diagonalization

Dimensional crossover of a Rabi-coupled two-component Bose–Einstein condensate in an optical lattice

Soliton trains after interaction quenches in Bose mixtures

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