Details

Autor(en) / Beteiligte

• Fumega, Adolfo O
• Lado, Jose L

Titel

Ferroelectric valley valves with graphene/MoTe 2 van der Waals heterostructures

Ist Teil von

• Nanoscale, 2023-02, Vol.15 (5), p.2181-2187

Ort / Verlag

England

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Ferroelectric van der Waals heterostructures provide a natural platform to design a variety of electrically controllable devices. In this work, we demonstrate that AB bilayer graphene encapsulated in MoTe acts as a valley valve that displays a switchable built-in topological gap, leading to ferroelectrically driven topological channels. Using a combination of calculations and low energy models, we show that the ferroelectric order of MoTe allows the control of the gap opening in bilayer graphene and leads to topological channels between different ferroelectric domains. Moreover, we analyze the effect that the moiré modulation between MoTe and graphene layers has in the topological modes, demonstrating that the edge states are robust against moiré modulations of the ferroelectrically-induced electric potential. Our results put forward ferroelectric/graphene heterostructures as versatile platforms to engineer switchable built-in topological channels without requiring an external electric bias.