Nearly massless Dirac fermions and strong Zeeman splitting in the nodal-line semimetal ZrSiS probed by de Haas-van Alphen quantum oscillations
Nearly massless Dirac fermions and strong Zeeman splitting in the nodal-line semimetal ZrSiS probed by de Haas-van Alphen quantum oscillations
复制标题
DOI：
10.1103/physrevb.96.045127
复制
发表时间：
2017-07-19
影响因子：
3.7
通讯作者：
Mao, Zhiqiang
中科院分区：
文献类型：
--
作者：
Hu, Jin;Tang, Zhijie;Mao, Zhiqiang
拓扑半金属代表了一类新的量子材料承载狄拉克/外尔费米子。拓扑费米子的基本性质可以通过量子振荡来揭示。在这里，我们提出了系统的de Haas-van Alphen（dHvA）振荡最近发现的拓扑狄拉克线半金属ZrSiS的研究。从dHvA振荡的角度依赖性，我们已经揭示了各向异性的狄拉克带在ZrSiS和发现令人惊讶的强塞曼分裂在低磁场。从塞曼分裂峰的分离估计的Lande g因子高达38。从dHvA振荡的分析，我们还发现了近零的有效质量和非常高的量子迁移率的狄拉克费米子在ZrSiS。这些结果揭示了新的狄拉克费米子物理的ZrSiS的性质。
Topological semimetals represent a new class of quantum materials hosting Dirac/Weyl fermions. The essential properties of topological fermions can be revealed by quantum oscillations. Here we present systematic de Haas-van Alphen (dHvA) oscillation studies on the recently discovered topological Dirac nodal-line semimetal ZrSiS. From the angular dependence of dHvA oscillations, we have revealed the anisotropic Dirac bands in ZrSiS and found surprisingly strong Zeeman splitting at low magnetic fields. The Lande g factor estimated from the separation of Zeeman splitting peaks is as large as 38. From the analyses of dHvA oscillations, we also revealed nearly zero effective mass and exceptionally high quantum mobility for Dirac fermions in ZrSiS. These results shed light on the nature of novel Dirac fermion physics of ZrSiS.