Evidence for a Dirac nodal-line semimetal in SrAs_3  

作　　者：Shichao Li Zhaopeng Guo Dongzhi Fu Xing-Chen Pan Jinghui Wang Kejing Ran Song Bao Zhen Ma Zhengwei Cai Rui Wang Rui Yu Jian Sun Fengqi Song Jinsheng Wen 

机构地区：[1]National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University [2]Department of Physics and Astronomy, Shanghai Jiao Tong University [3]School of Physics and Technology, Wuhan University [4]Collaborative Innovation Center of Advanced Microstructures, Nanjing University

出　　处：《Science Bulletin》2018年第9期535-541,共7页科学通报（英文版）

基　　金：supported by the National Natural Science Foundation of China(11674157,51372112 and 11574133);the National Key Research and Development Plan(2016YFA0300404);the National Basic Research Program of China(2015CB921202)

摘　　要：Dirac nodal-line semimetals with the linear bands crossing along a line or loop, represent a new topological state of matter. Here, by carrying out magnetotransport measurements and performing first-principle calculations, we demonstrate that such a state has been realized in high-quality single crystals of SrAs_3.We obtain the nontrivial ∏ Berry phase by analysing the Shubnikov-de Haas quantum oscillations. We also observe a robust negative longitudinal magnetoresistance induced by the chiral anomaly.Accompanying first-principles calculations identifies that a single hole pocket enclosing the loop nodes is responsible for these observations.Dirac nodal-line semimetals with the linear bands crossing along a line or loop, represent a new topological state of matter. Here, by carrying out magnetotransport measurements and performing first-principle calculations, we demonstrate that such a state has been realized in high-quality single crystals of SrAs3. We obtain the nontrivial π Berry phase by analysing the Shubnikov-de Haas quantum oscillations. We also observe a robust negative longitudinal magnetoresistance induced by the chiral anomaly. Accompanying first-principles calculations identifies that a single hole pocket enclosing the loop nodes is responsible for these observations.

关 键 词：Dirac nodal-line semimetal Magnetoresistance Berry phase Quantum oscillations DFT calculations Chiral anomaly 

分 类 号：O614.232[理学—无机化学]