2011/03/31 by Eran Sela, R. G. Pereira, Rodrigo G. Pereira
Mathematics · Physics and Astronomy · #Advanced Condensed Matter Physics #Antibonding molecular orbital #Antiferromagnetism #Atomic orbital #Condensed matter physics #Degenerate energy levels #Electron #Gapless playback #Geometry #Ising model #Mathematics #Multicritical point #Phase (matter) #Phase diagram #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Spin (aerodynamics) #Spins #Theoretical and Computational Physics #Zigzag #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.84.014407
published as Phys. Rev. B 84, 014407 (2011) · 9 pages
openalex publication_date 2011/07/20 · arxiv created 2011/08/19 · arxiv updated 2015/05/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Motivated by the quasi-one-dimensional antiferromagnet CaV2O4, we explore spin-orbital systems in which the spin modes are gapped but orbitals are near a macroscopically degenerate classical transition. Within a simplified model we show that gapless orbital liquid phases possessing power-law correlations may occur without the strict condition of a continuous orbital symmetry. For the model proposed for CaV2O4, we find that an orbital phase with coexisting order parameters emerges from a multicritical point. The effective orbital model consists of zigzag-coupled transverse field Ising chains. The corresponding global phase diagram is constructed using field theory methods and analyzed near the multicritical point with the aid of an exact solution of a zigzag XXZ model.