铜铁矿金属微结构中的低对称非局域输运
Low-symmetry non-local transport in microstructured squares of delafossite metals
摘要：
在基于半导体和石墨烯的二维系统中研究电子输运的弹道机制的密集工作被认为已经建立了该领域的大多数关键实验事实。然而，近年来，在准二维的铜铁矿金属中出现了新的弹道输运形式，这种金属的费米波长比以前研究的典型金属短100倍，费米面几乎是六边形，因此具有很强的刻面性。这对从经典的弹道输运实验中获得的结果有一些深远的影响，该实验研究了由铜铁矿单晶制成的介观正方形中的弯曲和霍尔电阻。我们观察到明显的各向异性的弯曲电阻，甚至是一个霍尔电压是强烈的不对称磁场。虽然我们的一些观察结果是非直观的第一眼看，我们表明，他们可以理解的非本地Landauer-Büttiker分析量身定制的对称性的正方形/六边形的几何形状的组合设备/费米表面系统。非本地传输的签名可以解决的线性尺寸为近100 $μ$ m，大约是15倍，大于从该设备制造的晶体的体平均自由程的平方。
英文摘要：
Intense work studying the ballistic regime of electron transport in two dimensional systems based on semiconductors and graphene had been thought to have established most of the key experimental facts of the field. In recent years, however, new forms of ballistic transport have become accessible in the quasi-two-dimensional delafossite metals, whose Fermi wavelength is a factor of 100 shorter than those typically studied in the previous work, and whose Fermi surfaces are nearly hexagonal in shape, and therefore strongly faceted. This has some profound consequences for results obtained from the classic ballistic transport experiment of studying bend and Hall resistances in mesoscopic squares fabricated from delafossite single crystals. We observe pronounced anisotropies in bend resistances and even a Hall voltage that is strongly asymmetric in magnetic field. Although some of our observations are non-intuitive at first sight, we show that they can be understood within a non-local Landauer-Büttiker analysis tailored to the symmetries of the square/hexagonal geometries of our combined device/Fermi surface system. Signatures of non-local transport can be resolved for squares of linear dimension of nearly 100 $μ$m, approximately a factor of 15 larger than the bulk mean free path of the crystal from which the device was fabricated.
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