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Probing topological valley currents by angular layer alignment in van der Waals heterostructures

Total Cost €


EC-Contrib. €






 TWISTRONICS project word cloud

Explore the words cloud of the TWISTRONICS project. It provides you a very rough idea of what is the project "TWISTRONICS" about.

nitride    graphene    observation    heterostructures    tools    phases    bilayer    topologically    axes    intrinsic    scarcity    previously    flow    superconductivity    transitions    certain    quantum    relative    rigorous    topology    layer    measured    practical    investigation    layers    protected    emergence    crystal    remarkable    aligned    few    experimental    curvature    fundamental    technologies    structures    tune    currents    vdw    origin    transition    berry    space    angular    dramatically    twistronics    powerful    trace    supercurrents    effect    spin    protection    striking    perturbations    inconclusive    electronic    answering    stacked    electron    heterostructure    advancements    linked    dissipation    degree    triad    charge    alter    van    rotatable    route    boron    carriers    valley    bn    valleytronics    trivial    correlated    der    2d    waals    alignment    topological    twisted    freedom    combined    dynamically    predicted    questions    technological    observations   

Project "TWISTRONICS" data sheet

The following table provides information about the project.


Organization address
address: RUE MICHEL ANGE 3
city: PARIS
postcode: 75794

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country France [FR]
 Total cost 1˙499˙543 €
 EC max contribution 1˙499˙543 € (100%)
 Programme 1. H2020-EU.1.1. (EXCELLENT SCIENCE - European Research Council (ERC))
 Code Call ERC-2019-STG
 Funding Scheme ERC-STG
 Starting year 2020
 Duration (year-month-day) from 2020-01-01   to  2024-12-31


Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 


 Project objective

The relative angular alignment between the stacked 2D layers of a van der Waals (vdW) heterostructure can dramatically alter its fundamental properties. A striking example is the recent observation of strongly correlated states and intrinsic superconductivity in twisted bilayer graphene. Another remarkable effect of angular layer alignment predicted for certain vdW heterostructures is the emergence of phases of matter with non-trivial topological properties, where charge carriers flow without dissipation, being protected against perturbations. In graphene aligned with boron nitride (BN), such a phase has been predicted, with topological protection linked not to the spin, as commonly observed, but rather to the valley degree of freedom. However, due to the scarcity of experimental tools to demonstrate this topological protection, or tune the transition between topologically trivial and non-trivial phases, the few experimental observations available remain inconclusive. The objective of TWISTRONICS is to contribute, with fundamental concepts, to future advancements of valleytronics, where the control over the valley degree of freedom is used for technological developments including quantum technologies. To reach this goal I propose a novel approach using dynamically rotatable heterostructures, combined with Berry curvature and real-space supercurrents distribution measurements, to tune and investigate the topological phases driven by crystal alignment on graphene/BN structures. This powerful triad will allow a rigorous investigation of the valley electronic states and phase transitions of this system, answering two important questions: i) What are the characteristics, origin and topology of the valley currents previously measured in graphene/BN aligned structures; and ii) how the valley currents and electron topology can be controlled by crystal axes alignment. This will trace a practical route to investigate and design topological phases in other vdW structures.

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