Work

Electronic properties and quantum transport behavior of twisted γ-graphdiyne/graphene

Year: 2025

Type: article

Abstract: Van der Waals heterostructures are acknowledged as the decent platform for electronic and optoelectronic applications owing to their atomically flat interfaces, unprecedented flexibility and unique physical characteristics. A twist angle between neighboring layers of two-dimensional materials renders with an additional mediator for flexible modulation of interlayer coupling and electrical structure. In this work, the carrier transport behavior of twisted moiré superlattices based on γ-graphdiyne which represents as the emerging category of carbon material family, is theoretically investigated for the first time. By probing a sequence of twisted γ-graphdiyne/graphene moiré superlattices, the sp-C is figured out to play a dominant role in manipulating the distribution of electron localization in the moiré system. The line and ring regions are identified as the primary geometric contributors to the density of states near the Fermi level in twisted γ-graphdiyne/graphene moiré superlattices. This twist engineering also enables to expedite quantum transport of γgraphdiyne/graphene heterostructures according to the nonequilibrium Green's function. This work unambiguously decodes the twist angle dependence of interlayer coupling for γ-graphdiyne /graphene heterobilayers and highlights the considerable enhancement of transport performance subtly triggered by a small twist angle (1°), benefitting more in-depth understanding and rational design of emerging graphyne-based quantum devices.

Source: National Science Open

DOI: 10.1360/nso/20250036