Predicting Large-Chern-Number Phases in a Shaken Optical Dice Lattice

Nearly flat band with Chern number C=2 on the dice lattice

We point out the possibility of nearly flat band with Chern number C=2 on the dice lattice in a simple nearest-neighbor tightbinding model. This lattice can be naturally formed by three adjacent $(111)$ layers of cubic lattice, which may be realized in certain thin films or artificial heterostructures, such as SrTiO$_3$/SrIrO$_3$/SrTiO$_3$ trilayer heterostructure grown along $(111)$ direction. The flatness of two bands is protected by the bipartite nature of the lattice. Including the Rashba spin-orbit coupling on nearest-neighbor bonds separate the flat bands with others but maintains their …

钙钛矿衍生的骰子晶格(La$X$O$_3$)$_3$/(LaAlO$_3$)$_3$(111)中的高陈数，其中$X=$ Ti、Mn和Co

High Chern numbers in a perovskite-derived dice lattice (La$X$O$_3$)$_3$/(LaAlO$_3$)$_3$(111) with $X=$ Ti, Mn and Co

本研究通过带库仑排斥项的DFT计算，探究三种元素掺杂的钙钛矿衍生骰子晶格超晶格的电子与拓扑性质，发现其可实现高陈数的非平庸拓扑相，为拓扑材料研究提供新平台。

Multitude of Topological Phase Transitions in Bipartite Dice and Lieb Lattices with Interacting Electrons and Rashba Coupling

We report the results of a Hartree-Fock study applied to interacting electrons moving in two different bipartite lattices: the dice and the Lieb lattices, at half-filling. Both lattices develop ferrimagnetic order in the phase diagram $U$-$λ$, where $U$ is the Hubbard onsite repulsion and $λ$ the Rashba spin-orbit coupling strength. Our main result is the observation of an unexpected multitude of topological phases for both lattices. All these phases are ferrimagnetic, but they differ among themselves in their set of six Chern numbers (six numbers because the unit cells have three atoms). The …

氯化钇电子化合物中的内禀拓扑骰子平带

Intrinsic Topological Dice Flat Band in Yttrium Monochloride Electrides

本研究预测氯化钇电子化合物中的骰子平带具有内禀拓扑性，陈数为±4，由原子自旋轨道耦合产生拓扑能隙，成为首个天然骰子平带陈带材料。

骰子晶格上的马约拉纳角态

Majorana corner states on the dice lattice

本文研究骰子晶格上吸引相互作用诱导的超导态，发现其呈现二阶拓扑相，并通过晶格角处的零能马约拉纳束缚态揭示该相，表明高陈数平带可实现高阶拓扑超导。

层状骰子晶格上的Floquet拓扑自旋-谷-层电子学

Floquet Topological Spin-Valley-Layertronics on a Layered Dice Lattice

本研究在层状骰子晶格体系中，利用圆偏振光、垂直位移场调控关联拓扑相，确立其为电控磁性与拓扑相的多功能平台，提供集成自旋-谷-层电子学的全电学方案。