Dynamics of a two-species Bose-Einstein condensate in a double well

Sun, Baoqing; Pindzola, M. S.

doi:10.1103/physreva.80.033616

Cited by 26 publications

(27 citation statements)

References 48 publications

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“…Such mixtures can be realized, e.g., by preparing alkali atoms in different hyperfine states [15] or by trapping different elements [16]. Due to the interplay between the intra-and inter-species interaction strengths, these systems show a number of intriguing features such as phase separation [17] including symbiotic excitations like interlacing vortex lattices with mutually filled cores [18] and dark-bright solitons [19], spincharge separation [20], various tunneling effects [21][22][23][24][25][26][27][28], collective excitations [29,30] and counterflow and paired superfluidity [31][32][33]. The purpose of this work is to develop a broadly applicable and efficient ab initio method for the quantum dynamics of such mixtures to explore the fundamental dynamical processes in trapped ultra-cold multi-species setups and study the few-to many-body transition.…”

Section: Introductionmentioning

confidence: 99%

Non-equilibrium quantum dynamics of ultra-cold atomic mixtures: the multi-layer multi-configuration time-dependent Hartree method for bosons

et al. 2013

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We develop and apply the multi-layer multi-configuration timedependent Hartree method for bosons, which represents an ab initio method for investigating the non-equilibrium quantum dynamics of multi-species bosonic systems. Its multi-layer feature allows for tailoring the wave function ansatz to describe intra-and inter-species correlations accurately and efficiently. To demonstrate the beneficial scaling and efficiency of the method, we explored the correlated tunneling dynamics of two species with repulsive intra-and inter-species interactions, to which a third species with vanishing intra-species interaction was weakly coupled. The population imbalances of the first two species can feature a temporal equilibration and their time evolution significantly depends on the coupling to the third species. Bosons of the first and second species exhibit a bunching tendency, whose strength can be influenced by their coupling to the third species.

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Section: Introductionmentioning

confidence: 99%

Non-equilibrium quantum dynamics of ultra-cold atomic mixtures: the multi-layer multi-configuration time-dependent Hartree method for bosons

et al. 2013

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“…The weakly interacting BECs provide a further context [46][47][48] for JEs in superconductor systems because they display a nonlinear generalization of typical d.c. and a.c. JEs and macroscopic quantum selftrapping, all of which have been observed in experiments [49][50][51]. Apart from the conventional single-species BECs [45][46][47][48], the Josephson dynamics of two-species BECs [52] and spinor BECs without SO coupling [53] have also been studied [54][55][56][57]; however, the dynamics of SO coupled BECs is yet to be explored.…”

Section: Introductionmentioning

confidence: 99%

Josephson dynamics of a spin-orbit-coupled Bose-Einstein condensate in a double-well potential

Zhang

Wang

et al. 2012

Phys. Rev. A

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We investigate the quantum dynamics of an experimentally realized spin-orbit coupled BoseEinstein condensate in a double well potential. The spin-orbit coupling can significantly enhance the atomic inter-well tunneling. We find the coexistence of internal and external Josephson effects in the system, which are moreover inherently coupled in a complicated form even in the absence of interatomic interactions. Moreover, we show that the spin-dependent tunneling between two wells can induce a net atomic spin current referred as spin Josephson effects. Such novel spin Josephson effects can be observable for realistically experimental conditions.

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“…Despite its simplicity, it features qualitatively different dynamical regimes-self-trapping and Josephson oscillations-already in the single-component case [6,[8][9][10][11], which has been realized experimentally with coupled spatial modes [12,13] and hyperfine states [14]. When a bi-component BEC is loaded into the double-well [15][16][17][18][19][20], new features emerge. For example, chaos [15,21], phase separation transitions [22] as well as ferromagnetic behavior [23] can arise, relying on the distinct inter-and intraspecies interactions in the system.…”

Section: Introductionmentioning

confidence: 99%

Dynamical effects of exchange symmetry breaking in mixtures of interacting bosons

2012

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In a double-well potential, a Bose-Einstein condensate exhibits Josephson oscillations or self-trapping, depending on its initial preparation and on the ratio of interparticle interaction to interwell tunneling. Here, we elucidate the role of the exchange symmetry for the dynamics with a mixture of two distinguishable species with identical physical properties, that is, which are governed by an isospecific interaction and external potential. In the mean-field limit, the spatial population imbalance of the mixture can be described by the dynamics of a single species in an effective potential with modified properties or, equivalently, with an effective total particle number. The oscillation behavior can be tuned by populating the second species while maintaining the spatial population imbalance and all other parameters constant. In the corresponding many-body approach, the single-species description approximates the full counting statistics well also outside the realm of spin-coherent states. The method is extended to general Bose-Hubbard systems and to their classical mean-field limits, which suggests an effective single-species description of multicomponent Bose gases with weakly an-isospecific interactions.

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Dynamics of a two-species Bose-Einstein condensate in a double well

Cited by 26 publications

References 48 publications

Non-equilibrium quantum dynamics of ultra-cold atomic mixtures: the multi-layer multi-configuration time-dependent Hartree method for bosons

Non-equilibrium quantum dynamics of ultra-cold atomic mixtures: the multi-layer multi-configuration time-dependent Hartree method for bosons

Josephson dynamics of a spin-orbit-coupled Bose-Einstein condensate in a double-well potential

Dynamical effects of exchange symmetry breaking in mixtures of interacting bosons

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