Rotonlike instability and pattern formation in spinor Bose-Einstein condensates

Details Rotonlike instability and pattern formation in spinor Bose-Einstein condensates Rotonlike instability and pattern formation in spinor Bose-Einstein condensates

2010-06-15

arxiv.org/abs/1006.2962v1

Physics

Condensed Matter

Quantum Gases

Scientific paper

We show that metastable phases of an antiferromagnetic spin-1 condensate in a simple model with pure contact interactions can exhibit a rotonlike minimum in the excitation spectrum. The introduction of magnetic field gives rise to the instability of roton modes, which can lead to spontaneous emergence of regular periodic, polygonal, polyhedral or crystalline patterns, as shown in numerical simulations within the truncated Wigner approximation. An explanation of the occurrence of rotonlike instability is given based on the energy and spin conservation laws.

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