论文标题

在ZRSIS中的Dirac Nodal-Loop周围的Fermi表面和田间诱导的准粒子隧道的测定

Determination of the Fermi surface and field-induced quasi-particle tunneling around the Dirac nodal-loop in ZrSiS

论文作者

Müller, C. S. A., Khouri, T., van Delft, M. R., Pezzini, S., Hsu, Y. -T., Ayres, J., Breitkreiz, M., Schoop, L. M., Carrington, A., Hussey, N. E., Wiedmann, S.

论文摘要

Fermi表面的明确而完整的确定是理解局部金属和半金属的电子特性的主要步骤,但只有在相对较少的情况下才实现此目标。在这项工作中,我们提出了一项在ZRSIS上的系统高场量子振荡研究,最高35 t,这是一个鼻线半学的教科书示例,只有线性分散带越过费米能。费米表面的拓扑用前所未有的精度确定,所有口袋都可以通过比较量子振荡与密度功能理论计算的测量角依赖性来确定。在低温下的Shubnikov-de Haas和De Haas-Van Alphen振荡的比较以及对各个丁格尔图的分析表明,电子口袋上存在显着增强的散射。沿晶体的C轴排列的阈值领域以上,ZRSI的特定笼子式费米表面允许电子孔隧穿在动量空间的有限空间中发生电子孔隧穿,从而导致具有复杂频谱的量子振荡。其他高频量子振荡表示包围整个狄拉克节点环的磁故障轨道。我们建议,量子振荡在高温的电阻率中的持久性是由几乎相等质量的轨道之间的明显干扰引起的。

Unambiguous and complete determination of the Fermi surface is a primary step in understanding the electronic properties of topical metals and semi-metals, but only in a relatively few cases has this goal been realized. In this work, we present a systematic high-field quantum oscillation study up to 35 T on ZrSiS, a textbook example of a nodal-line semimetal with only linearly dispersive bands crossing the Fermi energy. The topology of the Fermi surface is determined with unprecedented precision and all pockets are identified by comparing the measured angle dependence of the quantum oscillations to density functional theory calculations. Comparison of the Shubnikov-de Haas and de Haas-van Alphen oscillations at low temperatures and analysis of the respective Dingle plots reveal the presence of significantly enhanced scattering on the electron pocket. Above a threshold field that is aligned along the c-axis of the crystal, the specific cage-like Fermi surface of ZrSiS allows for electron-hole tunneling to occur across finite gaps in momentum space leading to quantum oscillations with a complex frequency spectrum. Additional high-frequency quantum oscillations signify magnetic breakdown orbits that encircle the entire Dirac nodal loop. We suggest that the persistence of quantum oscillations in the resistivity to high temperatures is caused by Stark interference between orbits of nearly equal masses.

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