arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0809.2821cond-mat.str-el
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弦网凝聚态的张量积表示

Tensor-product representations for string-net condensed states

Zheng-Cheng Gu, Michael Levin, Brian Swingle, Xiao-Gang Wen

摘要:

我们发现,一般弦网凝聚态有一个自然的张量积态(TPS)的表示。这些TPS是由局部张量构建的。它们既可以描述短程纠缠态(如对称破缺态),也可以描述长程纠缠态(如拓扑/量子有序的弦网凝聚态)。张量积表示为拓扑有序态提供了一种“平均场”描述,并可能成为研究这种态之间量子相变的一种强有力的方法。作为这方面的一个尝试,我们证明了所构造的TPS是量子态在一定波函数重整化群变换下的不动点。

英文摘要:

We show that general string-net condensed states have a natural representation in terms of tensor product states (TPS) . These TPS's are built from local tensors. They can describe both states with short-range entanglement (such as the symmetry breaking states) and states with long-range entanglement (such as string-net condensed states with topological/quantum order). The tensor product representation provides a kind of 'mean-field' description for topologically ordered states and could be a powerful way to study quantum phase transitions between such states. As an attempt in this direction, we show that the constructed TPS's are fixed-points under a certain wave-function renormalization group transformation for quantum states.

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