Phase transitions between topologically distinct gapped phases in isotropic spin ladders
Phase transitions between topologically distinct gapped phases in isotropic spin ladders
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DOI：
10.1103/physrevb.62.14965
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发表时间：
2000-12-01
影响因子：
3.7
通讯作者：
Scalapino, DJ
中科院分区：
文献类型：
--
作者：
Kim, EH;Fáth, G;Scalapino, DJ
我们考虑各种双腿梯子模型表现出间隙阶段。所有这些相都具有短程价键基态，并且它们都表现出弦序。然而，我们发现，短程价键基态分为两个拓扑不同的类，因此，存在两种拓扑不同类型的弦序。因此，并非所有的带隙相位都属于同一普适类。我们发现，相变发生时，我们属于不同的拓扑类模型之间的插值，我们研究这些转变的性质。
We consider various two-leg ladder models exhibiting gapped phases. All of these phases have short-ranged valence bond ground states, and they all exhibit string order. However, we show that short-ranged valence bond ground states divide into two topologically distinct classes, and as a consequence, there exist two topologically distinct types of string order. Therefore, not all gapped phases belong to the same universality class. We show that phase transitions occur when we interpolate between models belonging to different topological classes, and we study the nature of these transitions.