Dynamical Casimir effect for magnons in a spinor Bose-Einstein condensate

Details Dynamical Casimir effect for magnons in a spinor Bose-Einstein condensate Dynamical Casimir effect for magnons in a spinor Bose-Einstein condensate

2008-05-15

arxiv.org/abs/0805.2210v1

Phys. Rev. A 78, 033605 (2008)

Physics

Condensed Matter

Other Condensed Matter

8 pages, 3 figures

Scientific paper

10.1103/PhysRevA.78.033605

Magnon excitation in a spinor Bose-Einstein condensate by a driven magnetic field is shown to have a close analogy with the dynamical Casimir effect. A time-dependent external magnetic field amplifies quantum fluctuations in the magnetic ground state of the condensate, leading to magnetization of the system. The magnetization occurs in a direction perpendicular to the magnetic field breaking the rotation symmetry. This phenomenon is numerically demonstrated and the excited quantum field is shown to be squeezed.

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