典型文献
Dynamical properties of the Haldane chain with bond disorder
文献摘要：
By using Lanczos exact diagonalization and quantum Monte Carlo combined with stochastic analytic continuation,we study the dynamical properties of the S=1 antiferromagnetic Heisenberg chain with different strengths of bond disorder.In the weak disorder region,we find weakly coupled bonds which can induce additional low-energy excitation below the one-magnon mode.As the disorder increases,the average Haldane gap closes at δΔ～0.5 with more and more low-energy excitations coming out.After the critical disorder strength δc～1,the system reaches a random-singlet phase with prominent sharp peak at ω=0 and broad continuum at ω＞0 of the dynamic spin structure factor.In addition,we analyze the distribution of random spin domains and numerically find three kinds of domains hosting effective spin-1/2 quanta or spin-1 sites in between.These"spins"can form the weakly coupled long-range singlets due to quantum fluctuation which contribute to the sharp peak at ω=0.
文献关键词：
中图分类号：
作者姓名：
Jing-Kai Fang;Jun-Han Huang;Han-Qing Wu;Dao-Xin Yao
作者机构：
Center for Neutron Science and Technology,School of Physics,Sun Yat-sen University,Guangzhou 510275,China;State Key Laboratory of Optoelectronic Materials and Technologies,School of Physics,Sun Yat-sen University,Guangzhou 510275,China
文献出处：
引用格式：
[1]Jing-Kai Fang;Jun-Han Huang;Han-Qing Wu;Dao-Xin Yao-.Dynamical properties of the Haldane chain with bond disorder)[J].物理学前沿,2022(03):43-51
A类：
singlets
B类：
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AB值：
0.586667
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