Project description
A non-perturbative approach to studying magnon-phonon interactions
In many-body physics, understanding how vibrational and magnetic excitations (phonons and magnons) behave at finite temperatures is challenging. Traditional quasiparticle models simplify these interactions but often fail at higher temperatures. Despite their importance in spintronics, most approaches remain perturbative and incomplete. With the support of the Marie Skłodowska-Curie Actions programme, the MagPhoni project aims to establish a new framework for studying magnon-phonon interactions in crystals. The study will use many-body Green’s functions and map interactions onto diffuse X-ray patterns, providing further insight into materials such as iron, manganese oxide and cobalt. It will also explore magnetic excitations in metal-organic frameworks and paramagnons above the Néel temperature. Project results will pave the way for a unified theory of vibrational-magnetic excitations at finite temperatures.
Objective
A fundamental problem in many-body physics is the behaviour of collective degrees of freedom (DOF) in finite temperatures. The ubiquitous quasiparticle paradigm – phonons for vibrational DOF and magnons for magnetic DOF - linearizes the theory to arrive at an independent particle description. That this picture fails in finite temperatures is well-known and is usually addressed through a perturbative approach, supplementing the ideal plane waves with magnon-magnon and phonon-phonon scattering. Similarly, spin-lattice coupling can also compromise the validity of the phonon and magnon pictures. Spin-lattice interaction has recently attracted increased experimental and theoretical attention, given its potential significance in many subfields of material science, such as spin-thermoelectrics and spintronics. Still, most treatments remain perturbative, offering only renormalized resonances and finite excitation lifetimes. The inadequacy of such a description is immediately apparent for paramagnetism, or structural phase transitions, where the original ordered ground state of the quasiparticle is gone. This study sets out to establish a new conceptual framework for measuring and evaluating magnon-phonon interactions in crystals, adopting a phenomenological self-energy description which makes no assumptions about the magnitude of the effect. We will model the effect using many-body Green's functions to parameterize the excitation's correlation function and map the interaction into the diffuse X-ray pattern of archetypical systems (Fe, MnO, Co). Next, we will apply the generalized scheme to measure magnetic excitations in metal-organic frameworks inaccessible by traditional probes. Finally, I will explore the existence of paramagnons and magnetic phase transition above the Néel temperature. All three avenues, realized under a shared scheme, offer insight into a new unified phenomenological theory for vibrational-magnetic excitations in finite temperatures.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences physical sciences condensed matter physics quasiparticles
- natural sciences physical sciences atomic physics
- natural sciences physical sciences electromagnetism and electronics spintronics
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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)
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Programme(s)
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Multi-annual funding programmes that define the EU’s priorities for research and innovation.
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HORIZON.1.2 - Marie Skłodowska-Curie Actions (MSCA)
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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.
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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
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(opens in new window) HORIZON-MSCA-2024-PF-01
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OX1 2JD Oxford
United Kingdom
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