# Engineering nodal topological phases in Ising superconductors by magnetic superstructures

## TL;DR

This paper proposes a method to realize nodal topological superconductivity in TMDs by fabricating nanostructured ferromagnets with in-plane magnetization, enabling Majorana flat bands observable via STM without external magnetic fields.

## Contribution

It introduces a novel approach to induce topological phases in TMDs using ferromagnetic nanostructures with in-plane magnetization, avoiding external magnetic fields.

## Key findings

- Majorana flat bands can be observed with STM.
- The method applies to monolayer and multilayer TMDs.
- Proposed structures are feasible with existing technology.

## Abstract

Recently it was discovered that superconductivity in transition metal dichalcogenides (TMDs) is strongly affected by an out-of-plane spin-orbit coupling (SOC). In addition, new techniques of fabricating 2d ferromagnets on van der Waals materials are rapidly emerging. Combining these breakthroughs, we propose a realization of nodal topological superconductivity in TMDs by fabricating nanostructured ferromagnets with an in-plane magnetization on the top surface. The proposed procedure does not require application of external magnetic fields and applies to monolayer and multilayer (bulk) systems. The signatures of the topological phase include Majorana flat bands that can be directly observed by Scanning Tunneling Microscopy (STM) techniques. We concentrate on NbSe$_2$ and argue that the proposed structures demonstrating the nodal topological phase can be realized withing existing technology.