Miscibility in coupled dipolar and non-dipolar Bose–Einstein condensates

Kumar, Ramavarmaraja Kishor; Muruganandam, Paulsamy; Tomio, Lauro; Gammal, A.

doi:10.1088/2399-6528/aa8db5

Cited by 35 publications

(41 citation statements)

References 86 publications

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“…the study of the entropy of the mixture as defined in [44,57] and the monitor of dipole oscillations of the atomic clouds in a harmonic trap [35]. Here, similar to the works presented in [29,58],…”

Section: The Miscibility Phase Diagrammentioning

confidence: 91%

Miscibility regimes in a $^{23}$Na-$^{39}$K quantum mixture

Gutierrez,

de Oliveira,

Farias

et al. 2021

Preprint

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Effects of miscibility in interacting two-component classical fluids are relevant in a broad range of daily applications. When considering quantum systems, two-component Bose-Einstein condensates provides a well controlled platform where the miscible-immiscible phase transition can be completely characterized. In homogeneous systems, this phase transition is governed only by the competition between intra-and inter-species interactions. However in more conventional experiments dealing with trapped gases, the pressure of the confinement increases the role of the kinetic energy and makes the system more miscible. In the most general case, the miscibility phase diagram of unbalanced mixtures of different atomic species is strongly modified by the atom number ratio and the different gravitational sags. Here, we numerically investigate the ground-state of a 23 Na-39 K quantum mixture for different interaction strengths and atom number ratios considering realistic experimental parameters.Defining the spatial overlap between the resulting atomic clouds, we construct the phase diagram of the miscibility transition which could be directly measured in real experiments.

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Section: The Miscibility Phase Diagrammentioning

confidence: 91%

Miscibility regimes in a $^{23}$Na-$^{39}$K quantum mixture

Gutierrez,

de Oliveira,

Farias

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Proposals to characterize the regime of such system include the calculation of the binder cumulant of the system's magnetization [56], the difference between the centers of mass of each atomic cloud [32], the study of the entropy of the mixture as defined in [44,57] and the monitor of dipole oscillations of the atomic clouds in a harmonic trap [35]. Here, similar to the works presented in [29,58], we follow the definition of the miscible and immiscible phases and propose the calculation of the spatial overlap between the atomic clouds to be an indicator of the phase transition.…”

Section: The Miscibility Phase Diagrammentioning

confidence: 99%

Miscibility Regimes in a 23Na–39K Quantum Mixture

et al. 2021

View full text Add to dashboard Cite

The effects of miscibility in interacting two-component classical fluids are relevant in a broad range of daily applications. When considering quantum systems, two-component Bose–Einstein condensates provide a well-controlled platform where the miscible–immiscible phase transition can be completely characterized. In homogeneous systems, this phase transition is governed only by the competition between intra- and inter-species interactions. However, in more conventional experiments dealing with trapped gases, the pressure of the confinement increases the role of the kinetic energy and makes the system more miscible. In the most general case, the miscibility phase diagram of unbalanced mixtures of different atomic species is strongly modified by the atom number ratio and the different gravitational sags. Here, we numerically investigate the ground-state of a 23Na–39K quantum mixture for different interaction strengths and atom number ratios considering realistic experimental parameters. Defining the spatial overlap between the resulting atomic clouds, we construct the phase diagram of the miscibility transition which could be directly measured in real experiments.

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“…For a two-component BECs, when the kinetic energy is taken into account, miscible to immiscible transition is a second-order transition [60,61]. Miscibility for a twocomponent system can be characterized by the degree of overlap between the densities of the spin components.…”

Section: A Miscibility-order Parametermentioning

confidence: 99%

Influence of Rashba spin-orbit and Rabi couplings on the miscibility and ground state phases of binary Bose-Einstein condensates

Ravisankar,

Sriraman,

Kumar

et al. 2021

Preprint

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We study the miscibility properties and ground state phases of two-component spin-orbit (SO) coupled Bose-Einstein condensates (BECs) in a harmonic trap with strong axial confinement. By numerically solving the coupled Gross-Pitaevskii equations in the two-dimensional setting, we analyze the SO-coupled BECs for two possible permutations of the intra-and interspecies interactions, namely (i) weak intra-and weak interspecies interactions (W-W) and (ii) weak intra-and strong interspecies interactions (W-S). Considering the density overlap integral as a miscibility order parameter, we investigate the miscible-immiscible transition by varying the coupling parameters. We obtain various ground state phases, including plane wave, half quantum vortex, elongated plane wave, and different stripe wave patterns for W-W interactions. For finite Rabi coupling, an increase in SO coupling strength leads to the transition from the fully miscible to the partially miscible state. We also characterize different ground states in the coupling parameter space using the root mean square sizes of the condensate. The spin density vector for the ground state phases exhibits density, quadrupole and dipole like spin polarizations. For the W-S interaction, in addition to that observed in the W-W case, we witness semi vortex, mixed mode, and shell-like immiscible phases. We notice a wide variety of spin polarizations, such as density, dipole, quadrupole, symbiotic, necklace, and stripe-like patterns for the W-S case. A detailed investigation in the coupling parameter space indicates immiscible to miscible state phase transition upon varying the Rabi coupling for a fixed Rashba SO coupling. The critical Rabi coupling for the immiscible-miscible phase transition decreases upon increasing the SO coupling strength.

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Miscibility in coupled dipolar and non-dipolar Bose–Einstein condensates

Cited by 35 publications

References 86 publications

Miscibility regimes in a $^{23}$Na-$^{39}$K quantum mixture

Miscibility regimes in a $^{23}$Na-$^{39}$K quantum mixture

Miscibility Regimes in a 23Na–39K Quantum Mixture

Influence of Rashba spin-orbit and Rabi couplings on the miscibility and ground state phases of binary Bose-Einstein condensates

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