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Quantum spin Hall insulator with two dimensional crystals

Objective

Dissipationless electrical transport is a key paradigm to reduce energy consumption in our society. Recent advancements in
condensed matter physics have revealed that there exist ballistic transport channels at the surface or the edge of topological
insulators. These states are preserved by time-reversal symmetry and robust against back scattering. Exploiting topological
insulators is therefore a major step for future nondissipative nanoelectronics.
Nevertheless, such a topological phase of matter has been discovered in very few kinds of materials so far. Most of the
existing materials are difficult to fabricate, which limits scientific endeavor to explore their properties and also future
application. Recently, several theoretical studies have demonstrated that atomically thin graphene or other two dimensional
crystals may become two dimensional topological insulators (quantum spin Hall insulators) by inducing large spin-orbit
interaction. These materials are rich of novel physics and attract growing attention in their own right. Moreover, they are
easy to prepare by mechanical exfoliation, which facilitates to apply them to real nanoelectronics devices.
HELICOMBX is the first project which aims at establishing a basis for dissipationless electronics and spintronics with
graphene and transition metal dichalcogenides and unifying physics in topological phase, spintronics and two dimensional
crystals. The project is divided into three parts. First we will induce large spin-orbit interaction in graphene by adatoms
deposition and heterostructures construction with transition metal dichalcogenides. Spin-orbit interaction of each system is
then measured by magnetotransport measurements. Second we will exploit these functionalized two dimensional crystals for
spintronics devices. As the final part, quantized conductance will be measured as a signature of the edge states, and we will
integrate it into Josephson junctions to observe the Majorana fermions.

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Coordinator

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE CNRS
Net EU contribution
€ 173 076,00
Address
Rue michel ange 3
75794 Paris
France

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Region
Ile-de-France Ile-de-France Paris
Activity type
Research Organisations
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Other funding
€ 0,00