2002/04/30 by Takahiro Yamamoto, Koichiro Ide, Chikara Ishii
Physics and Astronomy · #Advanced Condensed Matter Physics #Bosonization #Condensed matter physics #Fermion #Ising model #Phase (matter) #Phase diagram #Physics #Physics of Superconductivity and Magnetism #Quantum many-body systems #Quantum mechanics #cond-mat.stat-mech #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.66.104408
published as Phys. Rev. B 66, 104408 (2002) · 5 pages, 5 figures
openalex publication_date 2002/09/09 · arxiv created 2002/09/19 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The critical properties of the frustrated Kondo necklace model with a half saturation magnetization (m=1/2) have been studied by means of an exact-diagonalization method. It is shown from bosonization technique that the model can be effectively expressed as a quantum sine-Gordon model. Thus it may show three (dimer plateau, N'eel plateau and Tomonaga-Luttinger liquid) phases due to competitions among the Ising anisotropy \ensuremathΔ, and the nearest- and next-nearest-neighbor exchange interactions J1 and J2. The boundary lines on the \ensuremathΔ-J2/J1 phase diagram separating the three phases are determined by the method of level spectroscopy, based on the conformal field theory.