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PhononMoments

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Phonon Magnetic Moments and Angular Momentum in Flexible Framework Materials

This project will study how the magnetic moments and orbital angular momenta of phonons are related to chemical structure, electronic structure, and to each other. Phonons, which are particle-like vibrational excitations in solids... see more

30/06/2023

ETH Zürich

191K€

Project Budget: 191K€

Project leader

EIDGENOESSISCHE TECHNISCHE HOCHSCHULE ZUERICH No se ha especificado una descripción o un objeto social para esta compañía.

PARTICIPATION DEPralty Sin fecha límite de participación.

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Financing granted El organismo H2020 notifico la concesión del proyecto The day 2023-06-30

MSCA-IF-2020: Individual Fellowships Objective:The goal of the Individual Fellowships is to enhance the creative and innovative potential...

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2 Participantes

ETH Zürich

191.15K€ | Leader

ABENGOA SOLAR NEW TECHNOLOGI...

393.84K€ | participant

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Project duration: 27 months Date Start: 2021-03-03
End date: 2023-06-30

Project leader

EIDGENOESSISCHE TECHNISCHE HOCHSCHULE ZUERICH No se ha especificado una descripción o un objeto social para esta compañía.

Project Budget 191K€

participation deadline Sin fecha límite de participación.

Project description This project will study how the magnetic moments and orbital angular momenta of phonons are related to chemical structure, electronic structure, and to each other. Phonons, which are particle-like vibrational excitations in solids, are not normally considered to have an angular momentum (a mechanical spin) or a magnetic moment (an electromagnetic spin). However, it has recently been discovered that vibrations that cause atoms to move in circles can in fact have these properties, although their magnitudes are thought to be extremely small in conventional materials. We aim to study these exotic properties of phonons in flexible framework materials, which are materials which combine extreme stiffness in some directions with extreme compliance in others. This combination can give rise to very low energy vibrational modes, which results in very large motions of the atoms, and therefore we expect flexible frameworks to have much larger phonon magnetic moments and angular momenta than in conventional materials. Our goal is to discover materials with very large phono-magnetic effects, ideally sufficiently large that they can be measured using existing experimental techniques. Large phono-magnetic effects would also allow the magnetic moment of the phonon to interact with magnetism due to the spins of electrons, leading to a heretofore undescribed physical interaction which could be useful in the study of magnetic materials. We will use computational and theoretical methods to study both materials where the circular motions of atoms require external stimulus to occur, and also chiral materials where the atoms can naturally move in circles. In this latter case, the introduction of magnetic order in the material can break the symmetry between phonons of one handedness and the other, potentially leading to emergent bulk effects such as a thermally driven angular momentum of the crystal as a whole.

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