Tuning Gap in Corrugated Graphene with Spin Dependence

TL;DR

This paper investigates how a band gap induced in curved graphene affects spin-dependent electron transport, revealing tunable transmission properties and potential for precise device applications.

Contribution

It introduces a model analyzing spin-dependent tunneling in curved graphene with a band gap, highlighting controllable transport features and resonance phenomena.

Findings

Band gap decreases transmission for same spin

Backscattering occurs with the same spin in ripples

Spatial shifts in conduction are highly tunable

Abstract

We study transmission in a system consisting of a curved graphene surface as an arc (ripple) of circle connected to two flat graphene sheets on the left and right sides. We introduce a mass term in the curved part and study the effect of a generated band gap in spectrum on transport properties for spin-up/-down. The tunneling analysis allows us to find all transmission and reflections channels modeled by the band gap. This later acts by decreasing the transmissions with spin-up/-down but increasing with spin opposite, which exhibit some behaviors look like bell-shaped curve. We find resonances appearing in reflection with the same spin, thus backscattering with a spin-up/-down is not null in ripple. We observe huge spatial shifts for the total conduction in our model and the magnitudes of these shifts can be efficiently controlled by adjusting the band gap. This high order tunability of the tunneling effect can be used to design highly accurate devises based on graphene.