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arXiv 1202.1965cond-mat.stat-mechcond-mat.quant-gasquant-ph
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一维相互作用玻色气体本征态热化假说的有限尺寸标度分析

Finite-Size Scaling Analysis of the Eigenstate Thermalization Hypothesis in a One-Dimensional Interacting Bose gas

Tatsuhiko N. Ikeda, Yu Watanabe, Masahito Ueda

摘要:

利用代数Bethe标度方法计算Lieb-Liniger模型的关联函数,对孤立量子系统中可能存在的本征态热化假设(ETH)进行了有限尺寸标度分析.我们发现,虽然ETH在强意义下不成立,但它在弱意义下仍然成立,即使对于可积系统也是如此。基于有限尺寸标度分析的结果,我们比较了弱ETH对热化的贡献与另一种热化机制典型性的贡献,并指出前者对后者的贡献仅为对数修正.

英文摘要:

By calculating correlation functions for the Lieb-Liniger model based on the algebraic Bethe ansatz method, we conduct a finite-size scaling analysis of the eigenstate thermalization hypothesis (ETH) which is considered to be a possible mechanism of thermalization in isolated quantum systems. We find that the ETH in the weak sense holds in the thermodynamic limit even for an integrable system although it does not hold in the strong sense. Based on the result of the finite-size scaling analysis, we compare the contribution of the weak ETH to thermalization with that of yet another thermalization mechanism, the typicality, and show that the former gives only a logarithmic correction to the latter.

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