A versatile model with three-dimensional triangular lattice for unconventional transport and various topological effects  

作　　者：Jing-Yang You Gang Su Yuan Ping Feng 

机构地区：[1]Department of Physics,National University of Singapore,Singapore 117551,Singapore [2]Kavli Institute for Theoretical Sciences,and CAS Center for Excellence in Topological Quantum Computation,University of Chinese Academy of Sciences,Beijing 100190,China [3]Centre for Advanced 2D Materials,National University of Singapore,Singapore 117546,Singapore

出　　处：《National Science Review》2024年第1期199-209,共11页国家科学评论（英文版）

基　　金：research/project is supported by the Ministry of Education;Singapore;under its MOE AcRF Tier 3 Award MOE2018-T3-1-002 and MOE AcRF Tier 2 grant;MOE2019-T2-2-030. G.S. is supported in part by the National Key R&D Program of China(2018YFA0305800);the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB28000000);the National Natural Science Foundation of China (11834014)。

摘　　要：The finite Berry curvature in topological materials can induce many subtle phenomena, such as the anomalous Hall effect(AHE), spin Hall effect(SHE), anomalous Nernst effect(ANE), non-linear Hall effect(NLHE) and bulk photovoltaic effects. To explore these novel physics as well as their connection and coupling, a precise and effective model should be developed. Here, we propose such a versatile model—a 3D triangular lattice with alternating hopping parameters, which can yield various topological phases,including kagome bands, triply degenerate fermions, double Weyl semimetals and so on. We reveal that this special lattice can present unconventional transport due to its unique topological surface states and the aforementioned topological phenomena, such as AHE, ANE, NLHE and the topological photocurrent effect. In addition, we also provide a number of material candidates that have been synthesized experimentally with this lattice, and discuss two materials, including a non-magnetic triangular system for SHE, NLHE and the shift current, and a ferromagnetic triangular lattice for AHE and ANE. Our work provides an excellent platform, including both the model and materials, for the study of Berry-curvature-related physics.

关 键 词：three-dimensional triangular lattice different topological phases various topological effects Berry curvature 

分 类 号：O469[理学—凝聚态物理]