标题： 二维蜂窝晶格上两轨道自旋-费米子模型中拓扑缺陷和自旋液体的出现 显示英文标题

标题： Emergence of topological defects and spin liquid in a two-orbital spin-fermion model on the honeycomb lattice

摘要： 稳定奇特的量子物质相，例如自旋液体，是凝聚态物理中的一个吸引人的课题。在这里，通过在蜂窝晶格上对两轨道自旋-费米子模型的蒙特卡罗研究，我们展示了巡游电子的轨道简并性和局域自旋的交换相互作用的协同效应可以显著抑制铁磁和反铁磁序，通过产生拓扑缺陷并经由连续相变产生中间的自旋液体态。这种相竞争也可以通过调节电子填充来实现。这些结果为在几何上非挫折的晶格上实现自旋液体提供了新的见解。 显示英文摘要

摘要： Stabilizing exotic quantum phases of matter, e.g. spin liquid, is an attractive topic in condensed matter. Here, by a Monte Carlo study of a two-orbital spin-fermion model on a honeycomb lattice, we show the cooperative effects of the orbital degeneracy of itinerant electrons and the exchange interaction of localized spins can significantly suppress both ferromagnetic and antiferromagnetic orders by generating topological defects and give rise to an intermediate spin liquid state via continuous phase transitions. This phase competition can also be achieved by tuning the electron filling. These results shed new light on realizing spin liquids on geometrically non-frustrated lattices.