Critical Exponent for the Quantum Spin Hall Transition in Z 2 Network Model

Critical Exponent for the Quantum Spin Hall Transition in Z 2 Network Model
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Z 2 网络模型中量子自旋霍尔跃迁的临界指数

DOI:
10.1142/9789814436861_0013
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发表时间:
2013
期刊:
--
影响因子:
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通讯作者:
K. Slevin
K. Slevin
中科院分区:
--
文献类型:
--
作者:
Koji M. Kobayashi;T. Ohtsuki;K. Slevin

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我们估计了描述金属-量子自旋霍尔绝缘体跃迁局域化长度发散的临界指数。量子自旋霍尔系统中金属-普通绝缘体跃迁的临界指数与拓扑平凡辛系统的临界指数一致。然而,金属-量子自旋霍尔绝缘体跃迁的临界指数的精确估计被证明是有问题的,因为在这种情况下,在本地化阶段的边缘状态的存在。我们已经克服了这个困难,通过分析第二个最小的正李雅普诺夫指数,而不是最小的正李雅普诺夫指数。我们发现临界指数ν = 2.73 ± 0.02,这与拓扑平凡辛系统的临界指数一致。
We have estimated the critical exponent describing the divergence of the localization length at the metal-quantum spin Hall insulator transition. The critical exponent for the metal-ordinary insulator transition in quantum spin Hall systems is known to be consistent with that of topologically trivial symplectic systems. However, the precise estimation of the critical exponent for the metal-quantum spin Hall insulator transition proved to be problematic because of the existence, in this case, of edge states in the localized phase. We have overcome this difficulty by analyzing the second smallest positive Lyapunov exponent instead of the smallest positive Lyapunov exponent. We find a value for the critical exponent ν = 2.73 ± 0.02 that is consistent with that for topologically trivial symplectic systems.
DOI: 10.1103/physrevb.70.035115
发表时间: 2004-04
期刊: Physical Review B
影响因子: 3.7
作者:
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通讯作者: Y. Asada;K. Slevin;T. Ohtsuki
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