Constant voltage driving current oscillation in the artificial graphene ribbon with deterministic chiral edges

Abstract

Semiconductor QD-based artificial graphene (AG) is a promising platform to unveil extraordinary graphene-like features due to the honeycomb topology and the carrier interactions. Here, QD-based AG with deterministic chiral edges is readily achieved on Si substrates. An abnormal current oscillation at a constant voltage is observed in the AG ribbon with chiral edges. It can be modulated by gate voltage, magnetic field, and temperature. These features are addressed in terms of the chiral edge states with quasiflat bands and the interband carrier transferring from the edge states to the bulk states of the AG ribbon. Our results demonstrate dramatic effects of edge states on the carrier transport in the AG ribbon, which will greatly promote the comprehensive studies on the fundamental properties and the development of innovative semiconductor devices based on AG ribbon or graphene with deterministic edge configurations.