Volume 121, Number 4, February 2018
|Number of page(s)||7|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||18 April 2018|
Quantum phases of a spin-1 ultracold Bose gas with three-body interactions
Department of Physics, Indian Institute of Technology Guwahati - Guwahati, Assam 781039, India
Received: 21 November 2017
Accepted: 1 April 2018
We study the effects of a three-body interaction potential on a spin-1 ultracold Bose gas using mean-field approach (MFA). For an antiferromagnetic (AF) interaction, we have found the existence of the odd-even asymmetry in the Mott insulating (MI) lobes in the presence of both the repulsive two- and three-body interactions. In case of a purely three-body repulsive interaction, the higher-order MI lobes stabilize against the superfluid phase. Also the spin nematic (singlet) formation occurs for all the odd (even) MI lobes for the former, while there is neither any asymmetry, nor spin nematic (singlet) formation being observed for the latter case. The results are confirmed after carefully scrutinizing the spin eigenvalue and spin nematic order parameter for both the cases. We have compared our MFA results with the analytic phase diagrams obtained using a perturbation mean-field (PMFA) expansion.
PACS: 67.85.Fg – Multicomponent condensates; spinor condensates / 67.85.Jk – Other Bose-Einstein condensation phenomena / 03.75.Mn – Multicomponent condensates; spinor condensates
© EPLA, 2018
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