Multicriticality of two-dimensional class-D disordered topological superconductors

A generic two-dimensional disordered topological superconductor in symmetry class D exhibits rich phenomenology and multiple phases: diffusive thermal metal (DTM), Anderson insulator (AI), quantum Hall (TQH) phase (a superconductor). We numerically investigate the diagram of a lattice model such superconductor, specifically focusing on transitions between phases associated universal critical behaviors. confirm existence tricritical point its repulsive nature at where three meet. characterize behaviors various points using numerical evaluation localization length, conductance (or conductivity), density states. conclude that two metal-insulator (DTM-TQH DTM-AI) belong to same universality class, whereas (TCP) represents distinct class.