论文标题
非马霍拉纳州在超导体 - 纳米线设备中产生几乎量化的电导率
Non-Majorana states yield nearly quantized conductance in superconductor-semiconductor nanowire devices
论文作者
论文摘要
INSB纳米线/NBTIN超导体设备中零源填充电压偏置的电导电压偏置显示峰值接近$ 2E^2/h $的量化值。几乎量化的谐振在隧道屏障强度，磁场和磁场方向上演变，与Majorana零模式一致。我们的设备在纳米线的两端具有两个隧道探针，该探头由超导体覆盖的400 nm纳米线段隔开。我们只发现几乎量化的零偏置峰位于纳米线的一端，而另一端相同参数的电导率下降。这破坏了主要的解释，因为Majorana模式必须成对。我们确实在零磁场附近和较高的电子密度下从端到端得出的状态，这不是基本的Majorana制度。我们列出了评估子段波形非局部性的程序，并根据其本地化提供了纳米线结合状态的分类。
Conductance at zero source-drain voltage bias in InSb nanowire/NbTiN superconductor devices exhibits peaks that are close to a quantized value of $2e^2/h$. The nearly quantized resonances evolve in the tunnel barrier strength, magnetic field and magnetic field orientation in a way consistent with Majorana zero modes. Our devices feature two tunnel probes on both ends of the nanowire separated by a 400 nm nanowire segment covered by the superconductor. We only find nearly quantized zero bias peaks localized to one end of the nanowire, while conductance dips are observed for the same parameters on the other end. This undermines the Majorana explanation as Majorana modes must come in pairs. We do identify states delocalized from end to end near zero magnetic field and at higher electron density, which is not in the basic Majorana regime. We lay out procedures for assessing the nonlocality of subgap wavefunctions and provide a classification of nanowire bound states based on their localization.
