论文标题
耗时二维拉曼晶格
Dissipative two-dimensional Raman lattice
论文作者
论文摘要
我们表明，耗时二维拉曼晶格可以在两种组分的超低原子气体中设计，在那里，二维旋转轨道耦合和照明原子损失的相互作用会导致密度流动到基础的正方形晶格。该流程是由非铁角角效应驱动的，在该效应下，本征态定位于系统的一个角落。我们说明，系统的拓扑边缘状态只能由非Bloch带理论来解释，在该理论中，明确考虑了批量特征状态的变形。可以通过在晶格中最初定位的冷凝物的动态演化来检测方向流，或者通过引入不动的杂质物种，该物种与拉曼晶格的基态在凝聚力中相互作用。
We show that a dissipative two-dimensional Raman lattice can be engineered in a two-component ultracold atomic gas, where the interplay of the two-dimensional spin-orbit coupling and lightinduced atom loss gives rise to a density flow diagonal to the underlying square lattice. The flow is driven by the non-Hermitian corner skin effect, under which eigenstates localize toward one corner of the system. We illustrate that the topological edge states of the system can only be accounted for by the non-Bloch band theory where the deformation of the bulk eigenstates are explicitly considered. The directional flow can be detected through the dynamic evolution of an initially localized condensate in the lattice, or by introducing an immobile impurity species that interact spin-selectively with a condensate in the ground state of the Raman lattice.
