Coexistence of Dirac fermion and charge density wave in the square-net-based semimetal LaAuSb2
Coexistence of Dirac fermion and charge density wave in the square-net-based semimetal LaAuSb2
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DOI：
10.1103/physrevb.108.245156
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发表时间：
2023-12
影响因子：
3.7
通讯作者：
Xue-Ke Wu;Zhixiang Hu;D. Graf;Yu Liu;Chaoyue Deng;Huixia Fu;A. Kundu;T. Valla;C. Petrovic;Aifeng Wang
中科院分区：
文献类型：
--
作者：
Xue-Ke Wu;Zhixiang Hu;D. Graf;Yu Liu;Chaoyue Deng;Huixia Fu;A. Kundu;T. Valla;C. Petrovic;Aifeng Wang
报道了自熔盐法生长的LaAuSb$2$单晶的磁输运性质、角分辨光电子能谱(ARPES)和密度泛函理论(DFT)计算。电阻率和霍尔测量表明，LaAuSb的电荷密度波(CDW)在77K发生转变。MR和De Haas-Van Alphen(DHvA)测量表明，LaAuSb$2$的输运性质主要由Sb方网中的Dirac费米子决定。ARPES测量和密度泛函理论计算揭示了一种具有方形网状拓扑半金属元素共同特征的电子结构，这与磁输运性质很好地吻合。我们的结果表明，在LaAuSb$2$中CDW和Dirac费米子共存，这两者都与Sb方网产生的能带相连，这表明方网可以作为一个结构基元来探索各种电子有序。
We report a comprehensive study of magnetotransport properties, angle-resolved photoemission spectroscopy (ARPES), and density functional theory (DFT) calculations on self-flux grown LaAuSb$_2$ single crystals. Resistivity and Hall measurements reveal a charge density wave (CDW) transition at 77 K. MR and de Haas-Van Alphen (dHvA) measurements indicate that the transport properties of LaAuSb$_2$ are dominated by Dirac fermions that arise from Sb square nets. ARPES measurements and DFT calculations reveal an electronic structure with a common feature of the square-net-based topological semimetals, which is in good agreement with the magnetotransport properties. Our results indicate the coexistence of CDW and Dirac fermion in LaAuSb$_2$, both of which are linked to the bands arising from the Sb-square net, suggesting that the square net could serve as a structural motif to explore various electronic orders.