论文标题
较高对称性保护拓扑状态的解义量子相变
Deconfined Quantum Phase Transition of a Higher-Order Symmetry-Protected Topological State
论文作者
论文摘要
可以在Plaquette调制的方格抗fiferromagnet中实现高阶（HO）对称性保护拓扑（SPT）状态，该抗铁磁铁在晶格的每个角落均带有旋转$ 1/2 $变性。在这项工作中，我们通过现场理论分析和量子蒙特卡洛模拟来表明，plaquette调节可以推动从HOSPT到整个解剖量子临界点（DQCP）的直接拓扑量子相变，从HOSPT转变为无序无序相位，抗铁磁性（AF）和brifeRMAGNETIC（AF）和VBS BRID（VBS）级别，因此是五QCP的DECC。过渡和HOSPT阶段的拓扑转变。因此，我们的工作揭示了SPT阶段拓扑转变和DQCPS之间的无处不在二元性。
A higher-order (HO) symmetry-protected topological (SPT) state can be realized in a plaquette-modulated square lattice antiferromagnet, which hosts a spin-$1/2$ degenerate mode on each corner of the lattice with open boundaries. In this work, we show with the field-theoretic analysis and quantum Monte Carlo simulations that the plaquette modulation can drive a direct topological quantum phase transition from the HOSPT to a trivial disordered phase across the deconfined quantum critical point (DQCP) between the antiferromagnetic (AF) order and the valence bond solid (VBS) order, thus the DQCP is a multicritical point bridging both the AF-VBS transition and the topological transition of the HOSPT phase. Our work thus reveals the ubiquitous duality between topological transitions of SPT phases and DQCPs.
