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Resolving the origin of the phonon thermal Hall Effect

Objective

Phonons, the quasiparticles of lattice vibrations, are the primary heat carriers in insulators. In many insulators, it has been observed that applying a heat current and a magnetic field perpendicular to it creates a transverse heat gradient via phonons, leading to the phonon thermal Hall effect. Despite the growing number of quantum materials exhibiting this effect, the underlying cause remains unclear, since phonons are neutral quasiparticles. A key unresolved question is whether this effect is due to an extrinsic mechanism, such as skew scattering that could cause asymmetric phonon scattering, or an intrinsic mechanism, like a Berry phase and generate a thermal Hall response. The PHONHALL project aims to identify the responsible mechanism. It will determine if the effect is intrinsic or extrinsic by examining two different aspects: the impact of introducing defects (via electron irradiation) and angle-resolved thermal Hall measurements. Understanding the phonon thermal Hall effect in quantum materials could enable controllable heat flow and low-power thermal devices, including materials that dissipate heat efficiently under high magnetic fields as required in high-field fusion magnets.

Fields of science (EuroSciVoc)

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Keywords

Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)

Programme(s)

Multi-annual funding programmes that define the EU’s priorities for research and innovation.

Topic(s)

Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.

Funding Scheme

Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.

HORIZON-TMA-MSCA-PF-EF - HORIZON TMA MSCA Postdoctoral Fellowships - European Fellowships

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Call for proposal

Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.

(opens in new window) HORIZON-MSCA-2025-PF

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Coordinator

ECOLE POLYTECHNIQUE
Net EU contribution

Net EU financial contribution. The sum of money that the participant receives, deducted by the EU contribution to its linked third party. It considers the distribution of the EU financial contribution between direct beneficiaries of the project and other types of participants, like third-party participants.

€ 226 420,56
Address
ROUTE DE SACLAY
91128 PALAISEAU CEDEX
France

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Activity type
Higher or Secondary Education Establishments
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Total cost

The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.

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