Boundary susceptibility in the spin-1/2 chain: Curie-like behavior without magnetic impurities.
Boundary susceptibility in the spin-1/2 chain: Curie-like behavior without magnetic impurities.
复制标题
自旋 1/2 链中的边界磁化率：无磁性杂质的类居里行为。
DOI：
10.1103/physrevlett.92.037206
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发表时间：
2003
影响因子：
8.6
通讯作者：
S. Eggert
中科院分区：
文献类型：
--
作者：
S. Fujimoto;S. Eggert
本文研究了自旋为1/2的海森堡链的低温热力学性质。基于边界共形场理论和数值密度矩阵重正化群计算，证明了在各向同性的情况下，即使在没有磁性杂质的情况下，杂质磁化率随温度的降低也表现出类似居里的发散行为.在比热系数的边界贡献中也发现了类似的奇异温度依赖性。在各向异性的情况下，对于1/2<Delta<1，这些边界量仍然表现出奇异的温度依赖性，服从具有反常维数的幂律。实验结果将被讨论。
We investigate the low-temperature thermodynamics of the spin-1/2 Heisenberg chain with open ends. On the basis of boundary conformal field theory arguments and numerical density matrix renormalization group calculations, it is established that in the isotropic case the impurity susceptibility exhibits a Curie-like divergent behavior as the temperature decreases, even in the absence of magnetic impurities. A similar singular temperature dependence is also found in the boundary contributions of the specific heat coefficient. In the anisotropic case, for 1/2<Delta<1, these boundary quantities still show a singular temperature dependence obeying a power law with an anomalous dimension. Experimental consequences will be discussed.