Degeneracy and symmetry have a profound relation in quantum systems. Here, we report gate-tunable subband degeneracy in PbTe nanowires with a nearly symmetric cross-sectional shape. The degeneracy is revealed in electron transport by the absence of a quantized plateau. Utilizing a dual gate design, we can apply an electric field to lift the degeneracy, reflected as emergence of the plateau. This degeneracy and its tunable lifting were challenging to observe in previous nanowire experiments, possibly due to disorder. Numerical simulations can qualitatively capture our observation, shedding light on device parameters for future applications.

中文翻译：

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半导体纳米线中的门可调子带简并性


简并性和对称性在量子系统中有着深刻的关系。在这里，我们报告了具有近对称横截面形状的 PbTe 纳米线中的栅极可调子带简并性。电子传输中的简并性是由于缺乏量子化平台而揭示的。利用双门设计，我们可以应用电场来解除简并性，表现为平台的出现。这种简并性及其可调提升在之前的纳米线实验中很难观察到，可能是由于无序。数值模拟可以定性地捕捉我们的观察结果，为未来的应用揭示器件参数。