2002/09/23 by Kun Yang, You‐Quan Li, You-Quan Li · 1 citation
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Component (thermodynamics) #Condensed matter physics #Ferromagnetism #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Quantum, superfluid, helium dynamics #Statistical physics #Theoretical physics #cond-mat.soft #cond-mat.stat-mech
paper · pdf · doi:10.1142/s0217979203018041
published as Int. J. Mod. Phys. B 17, 1027 (2003). · 4 pages, no figure
arxiv created 2002/09/23 · openalex publication_date 2003/03/20 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
For a two-component bosonic system, the components can be mapped onto a pseudo-spin degree of freedom with spin quantum number S = 1/2. We provide a rigorous proof that for a wide-range of real Hamiltonians with component independent mass and interaction, the ground state is a ferromagnetic state with pseudospin fully polarized. The spin-wave excitations are studied and found to have quadratic dispersion relations at long wavelength.