Pairing, Ferromagnetism, and Condensation of a normal spin-1 Bose gas

Abstract

We theoretically study the stability of a normal, spin disordered, homogenous spin-1 Bose gas against ferromagnetism, pairing, and condensation through a Random Phase Approximation which includes exchange (RPA-X). Repulsive spin-independent interactions stabilize the normal state against both ferromagnetism and pairing, and for typical interaction strengths leads to a direct transition from an unordered normal state to a fully ordered single particle condensate. Atoms with much larger spin-dependent interaction may experience a transition to a ferromagnetic normal state or a paired superfluid, but, within the RPA-X, there is no instability towards a normal state with spontaneous nematic order. We analyze the role of the quadratic Zeeman effect and finite system size.

4 pages, 3 figures, 1 table. Supplementary materials attached

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• Static and Dynamic Properties of Interacting Spin-1 Bosons in an Optical Lattice
• Finite temperature phase diagram of a spin-1 Bose gas
• Competition between Bose Einstein Condensation and spin dynamics
• Three fluid hydrodynamics of spin-1 Bose-Einstein condensates
• Stoner ferromagnetism in a thermal pseudospin-1/2 Bose gas
• Simulating frustrated magnetism with spinor Bose gases
• First-order phase transitions in spinor Bose gases and frustrated magnets
• Fluctuations of spinor Bose-Einstein condensates
• Berezinskii-Kosterlitz-Thouless transitions in an easy-plane ferromagnetic superfluid
• Magnetic polarons in two-component hard core bosons
• Spinor Bose gas in an elongated trap
• Phase transitions in dipolar spin-1 Bose gases
• Spin Liquid Condensate of Spinful Bosons