Chiral p-wave superconductivity in a twisted array of proximitized quantum wires

摘要

A superconductor with p_x + ip_y order has long fascinated the physics community because vortex defects in such a system host Majorana zero modes. Here, we propose a simple construction of a chiral superconductor using proximitized quantum wires and twist angle engineering as basic ingredients. A weakly coupled parallel array of these wires forms a gapless p-wave superconductor. Two such arrays, stacked on top of one another with a twist angle close to 90°, spontaneously break time reversal symmetry and produce a robust, fully gapped p_x + ip_y superconductor. We map out the topological phases of this setup, demonstrate the existence of Majorana zero modes in vortices, and discuss prospects for experimental realization.