扰动拓扑相位的鲁棒性
Robustness of a perturbed topological phase
摘要：
本文利用变分法和高阶级数展开法研究了在均匀磁场作用下复曲面编码模型拓扑相位的稳定性。我们发现，当这种扰动是足够强的，系统经历了拓扑相变的第一或第二阶性质取决于场的方向。当这个过渡是二阶的，它是在伊辛普适类，除了一个特殊的线上的临界指数驱动关闭的差距不断变化，揭示了一个新的拓扑普适类。
英文摘要：
We investigate the stability of the topological phase of the toric code model in the presence of a uniform magnetic field by means of variational and high-order series expansion approaches. We find that when this perturbation is strong enough, the system undergoes a topological phase transition whose first- or second-order nature depends on the field orientation. When this transition is of second order, it is in the Ising universality class except for a special line on which the critical exponent driving the closure of the gap varies continuously, unveiling a new topological universality class.
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