论文标题
北极石化烯中自发对称性破坏引起的域壁拓扑
Domain-wall topology induced by spontaneous symmetry breaking in polariton graphene
论文作者
论文摘要
我们在交错的极性石墨烯中进行了激子 - 波利顿（Polariton）冷凝的数值研究，显示$ K $和$ k'$ valleys的S频段间隙。凝结发生在$ k $或$ k'$，这是在动力学上的价值群体极值。考虑到有吸引力的北极星相互作用，可以产生空间扩展的冷凝物。在冷凝水积聚期间发生的自发对称性破坏导致在狂ki骨的场景之后形成谷极化域。单个山谷的选择打破了时间反转的对称性，而分离域的壁表现出拓扑保护的手性电流。因此，由于非平凡山谷拓扑与凝结引起的对称性破裂之间的相互作用，该电流出现。
We present a numerical study of exciton-polariton (polariton) condensation in a staggered polariton graphene showing a gapped s-band at the $K$ and $K'$ valleys. The condensation occurs at $K$ or $K'$, at the kinetically-favorable negative mass extrema of the valence band. Considering attractive polariton-polariton interaction allows to generate a spatially extended condensate. Spontaneous symmetry breaking occurring during the condensate build-up leads to the formation of valley-polarized domains following the Kibble-Zurek scenario. The selection of a single valley breaks time-reversal symmetry and the walls separating domains exhibit a topologically-protected chiral current. This current therefore emerges as a result of the interplay between the non-trivial valley topology and the condensation-induced symmetry breaking.
