Hugenholtz-Pines theorem for multicomponent Bose-Einstein condensates

Abstract

The Hugenholtz-Pines (HP) theorem is derived for Bose-Einstein condensates (BECs) with internal degrees of freedom. The low-energy Ward-Takahashi identity is provided in the system with the linear and quadratic symmetry breaking terms. This identity serves to organize the HP theorem for multicomponent BECs, such as the binary BEC as well as the spin-$f$ spinor BEC in the presence of a magnetic field with broken U$(1)$$\times$SO$(3)$ symmetry. The experimental method based on the Stern-Gerlach experiment is proposed for studying the Ward-Takahashi identity.

14 pages, 1 figure

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• Thermodynamics of the BCS-BEC crossover
• Spinor Dynamics in an Antiferromagnetic Spin-1 Condensate
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Cited by in corpus (3)

• Self-consistent theory of a homogeneous binary Bose mixture with strong repulsive interspecies interaction
• Stability of normal quantum-fluid mixtures
• Hugenholtz -- Pines relations and the critical temperature of a Rabi coupled binary Bose system