Density profiles of two-component Bose–Einstein condensates interacting with a Laguerre–Gaussian beam

We present an analytical study for density profiles of two-component Bose–Einstein condensates (BECs) in an isotropic trap within the miscible regime. The analytical equations for the density profiles and the conditions for three different density configurations are presented, which allow us to explore the density profile diagrams of general two-component BECs depending on broad ranges of experimental parameters. Furthermore, we show that the obtained explicit expressions of the density profiles can also be applied to study the collective modes of the two-component BECs, and the frequencies of the two-component BECs clearly characterize the density configurations.

Download Full-text

Phase separation of two-component Bose–Einstein condensates with monopolar interaction

Modern Physics Letters B ◽

10.1142/s0217984917502153 ◽

2017 ◽

Vol 31 (23) ◽

pp. 1750215 ◽

Cited By ~ 1

Author(s):

Long Zhu ◽

Jinbin Li

Keyword(s):

Phase Separation ◽

Long Range ◽

Wave Scattering ◽

Scattering Length ◽

Repulsive Interaction ◽

S Wave ◽

Interaction Point ◽

Density Profiles ◽

Two Component ◽

Bose Einstein

This paper analyzes the properties of the two-component Bose–Einstein condensates (BECs) with long-range monopolar interaction by means of Thomas–Fermi approximation (TFA). The effects of long-range monopolar interaction, inter-component short-range s-wave scattering, and particle numbers on the density profiles and phase separation of BECs are investigated. It is shown that atoms with the small intra-component s-wave scattering length are squeezed out when the monopolar interaction of these atoms is not large enough, and the density profile will be compressed when corresponding monopolar interaction is increased. Effective zero interaction point that the s-wave scattering repulsive interaction is neutralized by monopolar attractive interaction, is found. Varying of particle numbers will cause the transformation between phase separation and faint phase separation (or mixture).

Download Full-text

Anisotropic properties of phase separation in two-component dipolar Bose–Einstein condensates

Modern Physics Letters B ◽

10.1142/s0217984918500215 ◽

2018 ◽

Vol 32 (09) ◽

pp. 1850021

Author(s):

Wei Wang ◽

Jinbin Li

Keyword(s):

Phase Separation ◽

Wave Scattering ◽

Dipole Interaction ◽

S Wave ◽

Density Profiles ◽

Two Component ◽

Trap Potential ◽

Scattering Strength ◽

Bose Einstein ◽

Anisotropic Phase

Using Crank–Nicolson method, we calculate ground state wave functions of two-component dipolar Bose–Einstein condensates (BECs) and show that, due to dipole–dipole interaction (DDI), the condensate mixture displays anisotropic phase separation. The effects of DDI, inter-component s-wave scattering, strength of trap potential and particle numbers on the density profiles are investigated. Three types of two-component profiles are present, first cigar, along z-axis and concentric torus, second pancake (or blood cell), in xy-plane, and two non-uniform ellipsoid, separated by the pancake and third two dumbbell shapes.

Download Full-text