Planar Heterostructure Graphene -- Narrow-Gap Semiconductor -- Graphene

TL;DR

This paper explores a planar heterostructure of graphene and narrow-gap semiconductor, revealing its potential as an angle-dependent particle filter and switch due to the absence of Klein paradox within certain energy ranges.

Contribution

It demonstrates the absence of Klein paradox in this heterostructure and proposes its use as an angle-selective particle filter and switch device.

Findings

No Klein paradox when Dirac points are in the semiconductor gap

Existence of an energy range with damped solutions depending on incident angle

Potential application as a particle filter and electronic switch

Abstract

We investigate a planar heterostructure composed of two graphene films separated by a narrow-gap semiconductor ribbon. We show that there is no the Klein paradox when the Dirac points of the Brillouin zone of graphene are in a band gap of a narrow-gap semiconductor. There is the energy range depending on an angle of incidence, in which the above-barrier damped solution exists. Therefore, this heterostructure is a "filter" transmitting particles in a certain range of angles of incidence upon a potential barrier. We discuss the possibility of an application of this heterostructure as a "switch".