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arXiv 1002.1657cond-mat.str-elcond-mat.stat-mech
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张量积态的对称破缺与临界性

Symmetry breaking and criticality in tensor-product states

Chen Liu, Ling Wang, Anders W. Sandvik, Yu-Cheng Su, Ying-Jer Kao

摘要:

我们讨论了变分优化矩阵积态的横向场伊辛链,使用D*D矩阵与小D=2-10。对于有限的系统尺寸N,对称态和非对称破缺态都有能量最小值,它们在场值hc(N,D)处相互交叉;因此跃迁是一阶的。一个连续的过渡发展为N->无穷大。渐近临界行为总是平均场型的(磁化指数β =1/2),但随着D的增加,出现了一个真正的伊辛标度(β =1/8)的场强窗口。我们还证明了具有小张量的无限尺寸二维张量积(iPEPS)态的渐近平均场行为。

英文摘要:

We discuss variationally optimized matrix-product states for the transverse-field Ising chain, using D*D matrices with small D=2-10. For finite system size N there are energy minimums for symmetric as well as symmetry-broken states, which cross each other at a field value hc(N,D); thus the transition is first-order. A continuous transition develops as N->infinity. The asymptotic critical behavior is then always of mean-field type (the magnetization exponent beta=1/2), but a window of field strengths where true Ising scaling holds (beta=1/8) emerges with increasing D. We also demonstrate asymptotic mean-field behavior for infinite-size two-dimensional tensor-product (iPEPS) states with small tensors.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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