2000/06/30 by Mathias van den Bossche, M. van den Bossche, P. Azaria +3 · 2 citations
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Degenerate energy levels #Energy spectrum #Excited state #Ground state #Interpretation (philosophy) #Multiplet #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Quantum, superfluid, helium dynamics #Singlet state #Spectral line #Spectrum (functional analysis) #Spin (aerodynamics) #Theoretical physics #Thermodynamics #Variety (cybernetics) #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.86.4124
4 pages, 5 Postscript figures
arxiv created 2000/06/30 · openalex publication_date 2001/04/30 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The low-energy properties of the SU(4) spin-orbital model on a two-leg ladder are studied by a variety of analytical and numerical techniques. As in the case of SU(2) models, there is a singlet-multiplet gap in the spectrum, but the ground state is twofold degenerate. An interpretation in terms of SU(4)-singlet plaquettes is proposed. The implications for general two-dimensional lattices are outlined.