Substrate-supported triplet superconductivity in Dirac semimetals

TL;DR

This paper explores how substrates influence the electronic properties of 2D Dirac materials, demonstrating that substrate-induced buckling can enable triplet superconductivity in germanene on MoS₂.

Contribution

It reveals the constructive role of substrates in inducing exotic quantum states, specifically showing substrate effects can promote triplet superconductivity in buckled 2D materials.

Findings

Substrate coupling and buckling enable unconventional triplet superconductivity.

Germanene on MoS₂ is a promising platform for exotic superconducting states.

Substrate effects are crucial for tuning electronic quantum phases.

Abstract

Stimulated by the success of graphene and its emerging Dirac physics, the quest for versatile and tunable electronic properties in atomically thin systems has led to the discovery of various chemical classes of 2D compounds. In particular, honeycomb lattices of group-IV elements, such as silicene and germanene, have been found experimentally. Whether it is a necessity of synthesis or a desired feature for application purposes, most 2D materials demand a supporting substrate. In this work, we highlight the constructive impact of substrates to enable the realization of exotic electronic quantum states of matter, where the buckling emerges as the decisive material parameter adjustable by the substrate. At the example of germanene deposited on MoS$_2$, we find that the coupling between the monolayer and the substrate, together with the buckled hexagonal geometry, conspire to provide a highly suited scenario for unconventional triplet superconductivity upon adatom-assisted doping.