Little–Parks oscillations of a hollow superconducting cylinder are of interest for flux-driven topological superconductivity in single Rashba nanowires. The oscillations are typically symmetric in the orientation of the applied magnetic flux. Using double InAs nanowires coated by an epitaxial superconducting Al shell which, despite the non-centro-symmetric geometry, behaves effectively as one hollow cylinder, we demonstrate that a small misalignment of the applied parallel field with respect to the axis of the nanowires can produce field-asymmetric Little–Parks oscillations. These are revealed by the simultaneous application of a magnetic field perpendicular to the misaligned parallel field direction. The asymmetry occurs in both the destructive regime, in which superconductivity is destroyed for half-integer quanta of flux through the shell, and in the non-destructive regime, where superconductivity is depressed but not fully destroyed at these flux values.

空心超导圆柱体的 Little-Parks 振荡对于单个 Rashba 纳米线中通量驱动的拓扑超导性很有意义。振荡通常在所施加的磁通量的方向上是对称的。使用外延超导铝壳涂覆的双 InAs 纳米线，尽管具有非中心对称的几何形状，但实际上表现为一个空心圆柱体，我们证明所施加的平行场相对于纳米线轴的微小未对准可以产生场不对称小帕克斯振荡。这些是通过同时施加垂直于未对准的平行场方向的磁场来揭示的。这种不对称性发生在破坏性区域（其中超导性在穿过壳的半整数量子通量时被破坏）和非破坏性区域（其中超导性在这些通量值下被抑制但未完全破坏）。