Topological metal and high-order Dirac point in cubic Rashba model

TL;DR

This paper explores a 2D cubic Rashba model revealing topological metallic states and high-order Dirac points, with implications for edge states in normal and superconducting phases and potential material applications.

Contribution

It introduces a novel 2D cubic Rashba model exhibiting topological features and analyzes edge states in both normal and superconducting phases.

Findings

Edge states appear on open boundaries in the normal phase

Superconducting phase edge states can become gapped

Potential applications to interface superconductors

Abstract

We investigate the properties of the two-dimensional model with Rashba-type spin-orbit coupling cubic in electron momentum. In the normal phase, edge states emerge on open boundaries. In the superconducting phase, edge states could evolve into gapped fermionic edge states. Applications to realistic materials of interface superconductors are also discussed.