Predicting large-Chern-number phases in a shaken optical dice lattice

Predicting large-Chern-number phases in a shaken optical dice lattice
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预测摇动的光学骰子晶格中的大陈数相

DOI:
10.1103/physreva.101.043620
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发表时间:
2020-01
期刊:
影响因子:
2.9
通讯作者:
Gao Xianlong
Gao Xianlong
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Cheng Shujie;Yin Honghao;Lu Zhanpeng;He Chaocheng;Wang Pei;Gao Xianlong

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对于量子反常霍尔效应,拓扑非平凡大陈数位相的检测是一个有趣的课题。受Floquet拓扑相位最近研究的启发,本研究提出了一个周期性的驱动协议,工程师使用QAHE大陈数相位。本文研究了二维光学骰子晶格中的无自旋超冷费米子原子,该晶格具有最近邻跳跃和$\mathrm{\ensuremath{\Lambda}}$-或V-型亚晶格势,并受到圆形驱动力的作用.结果表明,存在大Chern数相,其Chern数为C=\ensuremath{-}3$,这与边态准能谱一致.
With respect to the quantum anomalous Hall effect (QAHE), the detection of topological nontrivial large-Chern-number phases is an intriguing subject. Motivated by recent research on Floquet topological phases, this study proposes a periodic driving protocol to engineer large-Chern-number phases using the QAHE. Herein, spinless ultracold fermionic atoms are studied in a two-dimensional optical dice lattice with nearest-neighbor hopping and a $\mathrm{\ensuremath{\Lambda}}$- or V-type sublattice potential subjected to a circular driving force. Results suggest that large-Chern-number phases exist with Chern numbers $C=\ensuremath{-}3$, which is consistent with the edge-state quasienergy spectra.
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