We study spin mixing dynamics in a chromium dipolar Bose-Einstein condensate, after tilting the atomic spins by an angle\ θ\ with respect to the magnetic field. Spin mixing is triggered by dipolar coupling, but, once dynamics has started, it is mostly driven by contact interactions. For the particular case\ θ=π/2, an external spin-orbit coupling term induced by a magnetic gradient is required to enable the dynamics. Then the initial ferromagnetic character of the gas is locally preserved, an unexpected feature that we attribute to large spin-dependent contact interactions.
BT - Physical Review A DA - 2018-01 DO - 10.1103/PhysRevA.97.023610 N2 -We study spin mixing dynamics in a chromium dipolar Bose-Einstein condensate, after tilting the atomic spins by an angle\ θ\ with respect to the magnetic field. Spin mixing is triggered by dipolar coupling, but, once dynamics has started, it is mostly driven by contact interactions. For the particular case\ θ=π/2, an external spin-orbit coupling term induced by a magnetic gradient is required to enable the dynamics. Then the initial ferromagnetic character of the gas is locally preserved, an unexpected feature that we attribute to large spin-dependent contact interactions.
PY - 2018 T2 - Physical Review A TI - Spin mixing and protection of ferromagnetism in a spinor dipolar condensate UR - https://link.aps.org/article/10.1103/PhysRevA.97.023610https://link.aps.org/accepted/10.1103/PhysRevA.97.023610 VL - 97 SN - 2469-9926 ER -