Fig. 1

Proposed NPM Structure. (a) 3D model of the NPM. (b) Unit cell structure and parameters. (c) First Brillouin zone of the reciprocal lattice of NPM, where the blue highlighted regions represent the irreducible Brillouin zone, and high-symmetry points are labeled with \(\:\varGamma\:\), \(\:X\), \(\:M\), and \(\:R\).