National Changhua University of Education Institutional Repository : Item 987654321/14093
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題名: Magnetic Impurities in a One-dimensional Spin-orbital Model
作者: Lee, Yu-Wen;Lee, Yu-Li
貢獻者: 物理學系
日期: 2000-08
上傳時間: 2012-09-10T06:07:37Z
出版者: The American Physical Society
摘要: Using a one-dimensional spin-orbital model as a typical example of quantum spin systems with richer symmetries, we study the effect of an isolated impurity on its low-energy dynamics in the gapless phase through bosonization and renormalization-group methods. In the case of internal impurities, depending on the symmetry, the boundary fixed points can be either an open chain with a residual spin or (and) orbital triplet left behind, or a periodic chain. However, these two fixed points are indistinguishable in the sense that in both cases, the lead-correction-to-scaling boundary operators (LCBO) only show Fermi-liquid-like corrections to thermodynamical quantities (except the possible Curie-like contributions from the residual moments in the former cases). In the case of external (Kondo) impurities, the boundary fixed points, depending on the sign of orbital couplings, can be either an open chain with an isolated orbital doublet due to Kondo screening or an intermediate fixed point with the same LCBO as that of the two-channel Kondo problem. Comparison with the Kondo effect in one-dimensional Heisenberg spin chain and multiband Hubbard models is also made.
關聯: Phys. Rev. B, 62(5): 3279-3286
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