2004/08/10 by Hiroaki Onishi, Takashi Hotta · 2 citations
Materials Science · Mathematics · Physics and Astronomy · #Advanced Condensed Matter Physics #Anisotropy #Antiferromagnetism #Chain (unit) #Condensed matter physics #Degenerate energy levels #Density matrix renormalization group #Excited state #Frustration #Geometry #Ground state #Heisenberg model #Hubbard model #Magnetism in coordination complexes #Mathematics #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Renormalization group #Spin (aerodynamics) #Zigzag #cond-mat.str-el
paper · pdf · doi:10.1016/j.physb.2005.01.187
published as Physica B 359-361 (2005) 669 · 2 pages, 2 figures, Proceedings of SCES'04 (July 26-30, 2004, Karlsruhe)
arxiv created 2004/08/10 · openalex publication_date 2005/02/21 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
By using the density matrix renormalization group method, we investigate ground- and excited-state properties of the eg-orbital degenerate Hubbard model at quarter filling for two kinds of lattices, zigzag chain and ladder. In the zigzag chain, the system is effectively regarded as a decoupled double chain of the S=1/2 antiferromagnetic Heisenberg model, and the spin gap is approximately zero, similar to the case of weakly coupled Heisenberg chains. On the other hand, in the ladder, the spin correlation on the rung remains robust and the spin gap exists.