Enhancement of electron-hole superfluidity in double few-layer graphene

TL;DR

This paper proposes a novel double few-layer graphene structure to observe electron-hole superfluidity at higher densities and transition temperatures, potentially reaching 40 K, using current experimental techniques.

Contribution

It introduces a new nanostructure with coupled few-layer graphene sheets to enhance superfluidity and transition temperatures compared to prior approaches.

Findings

Superfluidity transition temperature can reach up to 40 K.

Double trilayer and quadlayer graphene are suitable for experimental realization.

Enhanced electron-hole pairing regime accessible with current technology.

Abstract

We propose two coupled electron-hole sheets of few-layer graphene as a new nanostructure to observe superfluidity at enhanced densities and enhanced transition temperatures. For ABC stacked few-layer graphene we show that the strongly correlated electron-hole pairing regime is readily accessible experimentally using current technologies. We find for double trilayer and quadlayer graphene sheets spatially separated by a nano-thick hexagonal boron-nitride insulating barrier, that the transition temperature for electron-hole superfluidity can approach temperatures of 40 K.