Quasi-two-dimensional relativistic fermions probed by de Haas–van Alphen quantum oscillations in LuSn2
Quasi-two-dimensional relativistic fermions probed by de Haas–van Alphen quantum oscillations in LuSn2
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DOI：
10.1103/physrevb.103.125109
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发表时间：
2021-03
影响因子：
3.7
通讯作者：
Yanglin Zhu;Jin Hu;D. Graf;X. Gui;W. Xie;Z. Mao
中科院分区：
文献类型：
--
作者：
Yanglin Zhu;Jin Hu;D. Graf;X. Gui;W. Xie;Z. Mao
本文报道了层状化合物{Lu}{{Sn}}{2}$的de Haas-van Alphen(DHvA)量子振荡研究。通过对dHvA振荡数据的分析，我们发现该材料有几个3D带和一个含有相对论性费米子的准2D带。与已报道的dHvA在{Y}{2，}中的振荡相比，来自准2D带的振荡分量显著增强。从单晶X射线衍射的结构分析中，我们发现扭曲的锡方网层的波纹比{Y}的波纹小，这解释了在该层中产生的相对论性费米子的二维增强。这一结果表明，相对论能带的维度可以通过稀土的电负性来调节。此外，我们还发现，由于增强的自旋-轨道耦合，3D相对论带相对于费米能级更接近于费米能级。这些发现表明，通过调节电负性、自旋-轨道耦合和磁性，可以为寻找新的拓扑态提供一个有趣的平台。
We report de Haas--van Alphen (dHvA) quantum oscillation studies on a layered compound $\mathrm{Lu}{\mathrm{Sn}}_{2}$. Through the analyses of the dHvA oscillation data, we find this material has several 3D bands and one quasi-2D band hosting relativistic fermions. Compared to previously reported dHvA oscitations in $\mathrm{Y}{\mathrm{Sn}}_{2,}$, the oscillation component arising from the quasi-2D band is significantly enhanced. From structural analyses using single-crystal x-ray diffraction, we find the distorted Sn-square net layer is less corrugated than $\mathrm{Y}{\mathrm{Sn}}_{2,}$, which accounts for the enhancement of two dimensionality of the relativistic fermions created in this layer. This result suggests that the dimensionality of relativistic band in $\mathrm{RE}{\mathrm{Sn}}_{2}$ ($\mathrm{RE}=\mathrm{rare}$ earth) can be tuned by electronegativity of RE. Moreover, we also find the 3D relativistic bands are pushed closer to the Fermi level with respect to $\mathrm{Y}{\mathrm{Sn}}_{2,}$ due to enhanced spin-orbital coupling. These findings imply $\mathrm{RE}{\mathrm{Sn}}_{2}$ can be an interesting platform for seeking new topological states via the tuning of electronegativity, spin-orbital coupling, and magnetism.