CORDIS
EU research results

CORDIS

English EN
Quantum devices in topological matter: carbon nanotubes, graphene, and novel superfluids

Quantum devices in topological matter: carbon nanotubes, graphene, and novel superfluids

Objective

The project addresses quantum devices in hybrid systems formed using carbon nanotubes, graphene, and 3He superfluid, all with particular topological characteristics. Topological properties of these non-trivial materials can be drastically modified by introducing defects or interfaces into them, like single layer graphene into superfluid helium, boron nitride between graphene sheets, carbon nanotubes in 3He superfluid, or misfit dislocation layers into HOPG graphite.

We are particularly interested in graphene/3He systems where graphene acts as an interface/substrate of interacting atomic ensembles. The atomic interactions across graphene are expected to provide novel mesoscopic condensates. By studying the topological phases of thin 3He layers and graphene immersed into superfluid 3He, we will investigate pairing across the graphene interface, deduce the origin of supercurrents, and look for excitonic superfluidity in these systems.

Single walled carbon nanotubes provide high-quality nanomechanical resonators with extraordinary properties. By using proximity-induced superconductivity, these objects will be integrated into circuit optomechanics in a way that facilitates strong coupling between the mechanical motion and the microwave cavity. By using adiabatic nuclear refrigeration, these non-linear quantum objects will be cooled below 1 mK, at the temperature of which the quantum ground state is reached. The cooling relies on immersion of the SWNT into superfluid 3He which, in the limit T -> 0, provides a quantum vacuum with unique topological properties. Intriguingly, the characteristics of this vacuum can be probed by ultrasensitive detectors provided by the suspended SWNTs.

Finally, besides non-classical phonon states, e.g. Fock states in the mechanical resonator, reaching the ground state of such an anharmonic oscillator will allow studies of quantum tunnelling of a macroscopic object from its metastable minimum when biased with a large gate voltage.
Leaflet | Map data © OpenStreetMap contributors, Credit: EC-GISCO, © EuroGeographics for the administrative boundaries

Host institution

AALTO KORKEAKOULUSAATIO SR

Address

Otakaari 1
02150 Espoo

Finland

Activity type

Higher or Secondary Education Establishments

EU Contribution

€ 2 398 536

Beneficiaries (1)

Sort alphabetically

Sort by EU Contribution

Expand all

AALTO KORKEAKOULUSAATIO SR

Finland

EU Contribution

€ 2 398 536

Project information

Grant agreement ID: 670743

Status

Ongoing project

  • Start date

    1 January 2016

  • End date

    31 December 2020

Funded under:

H2020-EU.1.1.

  • Overall budget:

    € 2 398 536

  • EU contribution

    € 2 398 536

Hosted by:

AALTO KORKEAKOULUSAATIO SR

Finland