Fragmented condensates of singly trapped dipolar Bose gases

Kwangsik T. Nho, David Paul Landau

Shivam Singh, Ayan Khan

G. M. Falco

Recently, Nattermann and Pokrovsky (2008 Phys. Rev. Lett. 100 060402) have proposed a scaling approach for studying Bose–Einstein condensates in strongly disordered traps. In this paper we implement their scaling argument in the framework of the variational method for solving the time-dependent Gross–Pitaevskii equation. We consider atomic gases with both short-range s -wave interaction and long-range anisotropic dipolar interaction. The theory is addressed to the regime of strong disorder and weak interactions where the physics is dominated by the collective pinning due to the disorder. The phenomenon of condensate fragmentation in dipolar gases is also analysed.

Krzysztof Góral, Luis Santos

We analyze the ground-state properties and the excitation spectrum of Bose-Einstein condensates of trapped dipolar particles. First, we consider the case of a single-component polarized dipolar gas. For this case we discuss the influence of the trapping geometry on the stability of the condensate as well as the effects of the dipole-dipole interaction on the excitation spectrum. We discuss also the ground state and excitations of a gas composed of two antiparallel dipolar components.

M. Baranov, Ł. Dobrek, K. G ral +3 more

We present a review of recent results concerning the physics of ultracold trapped dipolar gases. In particular, we discuss the Bose-Einstein condensation for dipolar Bose gases and the BCS transition for dipolar Fermi gases. In both cases we stress the dominant role of the trap geometry in determining the properties of the system. We present also results concerning bosonic dipolar gases in optical lattices and the possibility of obtaining a variety of different quantum phases in such a case. Finally, we analyze various possible routes towards achieving ultracold dipolar gases.

Ryan Wilson, Shai Ronen, John L. Bohn