Dipolar Bose gas with three-body interactions at finite temperature

2019

New J. Phys.

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We calculate analytically the quantum and thermal fluctuations corrections of a dilute quasi-twodimensional Bose-condensed dipolar gas. We show that these fluctuations may change their character from repulsion to attraction in the density-temperature plane owing to the striking momentum dependence of the dipole-dipole interactions. The dipolar instability is halted by such unconventional beyond mean field corrections leading to the formation of a droplet phase. The equilibrium features and coherence properties exhibited by such droplets are deeply discussed. At finite temperature, we find that the equilibrium density crucially depends on the temperature and on the confinement strength and thus, a stable droplet can exist only at ultralow temperature due to the strong thermal fluctuations.

supporting

confidence: 54%

Section: Discussionmentioning

confidence: 99%

Two-dimensional quantum droplets in dipolar Bose gases

2019

New J. Phys.

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“…To this end, we employ the Hartree-Fock-Bogoliubov (HFB) theory. This scheme has been successfully utilized in 3D dipolar one-component systems with two-and three-body interactions [19][20][21]. Our work reveals two important effects which are dissimilar to a single component BEC, (i) large condensate depletion (ii) near the phase separation and at low temperature, the thermal contribution to the depletion and all thermodynamic quantities has a distinct temperature dependence.…”

Section: Introductionmentioning

confidence: 89%

Fluctuations and quantum self-bound droplets in a dipolar Bose-Bose mixture

2018

Phys. Rev. A

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We systematically investigate the properties of three-dimensional dipolar binary Bose mixture at low temperatures. A set of coupled self-consistent equations of motion are derived for the two condensates. In the homogeneous case, useful analytical formulas for the condensate depletion, the anomalous density, the ground-state energy, and the equation of state are obtained. The theory is extended to the inhomogeneous case and the importance of the inhomogeneity is highlighted. Our results open up a new avenue for studying dipolar mixture droplets. Impacts of the dipoledipole interaction on the stability, density profiles, and the size of the self-bound droplet are deeply discussed. The finite-temperature behavior of such a state is also examined.

“…In the context of ultracold atoms with DDI, it has been revealed that the combined effects of TBI and DDI may lead to the formation of a stable supersolid state [28] and a quantum droplet state [29][30][31][32][33]. Very recently, we have shown that the TBI may shift the density profiles, the condensed fraction and the collective modes of a dipolar condensate at finite temperature [34].…”

Section: Introductionmentioning

confidence: 99%

Dipolar Bose gas with three-body interactions in weak disorder

Keltoum

2019

Eur. Phys. J. D

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We study effects of weak disorder with Gaussian correlation function on a dipolar Bose gas with three-body interactions using the Hartree-Fock-Bogoliubov theory. Corrections due to quantum, thermal and disorder fluctuations to the condensate depletion, the one-body density correlation function as well as to the equation of state and the ground state energy are properly calculated. We show that the intriguing interplay of the disorder, dipole-dipole interactions and three-body interactions plays a fundamental role in the physics of the system. Interestingly, we find that the three-body interactions release atoms localized in the respective minima of the random potential.