In a thin Weyl semimetal, a thickness dependent Weyl-orbit quantum oscillation was proposed to exist, originating from a nonlocal cyclotron orbit via electron tunnelings between top and bottom Fermi-arc surface states. Here, magneto-transport measurements were carried out on untwinned Weyl metal SrRuO₃ thin films. In particular, quantum oscillations with a frequency F_s1 ≈ 30 T were identified, corresponding to a small Fermi pocket with a light effective mass. Its oscillation amplitude appears to be at maximum for thicknesses in a range of 10 to 20 nm, and the phase of oscillation exhibits a systematic change with film thickness. The constructed Landau fan diagram shows an unusual concave downward curvature in the 1/μ₀H_n-n curve, where n is the Landau level index. From thickness and field-orientation dependence, the F_s1 oscillation is attributed to be of surface origin. Those findings can be understood within the framework of the Weyl-orbit quantum oscillation effect with non-adiabatic corrections.

在薄的 Weyl 半金属中，提出存在依赖于厚度的 Weyl 轨道量子振荡，该振荡源自非局域回旋加速器轨道，通过顶部和底部费米弧表面态之间的电子隧道效应。在这里，磁传输测量是在非孪晶外尔金属 SrRuO ₃薄膜上进行的。特别是，确定了频率为F _s1  ≈ 30 T 的量子振荡，对应于具有轻有效质量的小费米袋。对于 10 至 20 nm 的厚度，其振荡幅度似乎最大，并且振荡相位随薄膜厚度呈现系统变化。构建的 Landau 扇形图显示 1/ μ ₀ H _{n中不寻常的凹向下曲率}- n曲线，其中n是 Landau 水平指数。从厚度和场取向依赖性来看，F _s1振荡归因于表面起源。这些发现可以在具有非绝热校正的 Weyl 轨道量子振荡效应的框架内理解。