Project

Back to overview

Quantum Magnetism - from fundamentals to applications

English title Quantum Magnetism - from fundamentals to applications
Applicant Rønnow Henrik M.
Number 188648
Funding scheme Project funding (Div. I-III)
Research institution EPFL SB IPHYS CQSL Computational Quantum Science Laboratory)
Institution of higher education EPF Lausanne - EPFL
Main discipline Condensed Matter Physics
Start/End 01.10.2019 - 30.09.2023
Approved amount 1'000'000.00
Show all

Keywords (10)

Magnetism; Skyrmions; Resonating valence bond; Dipole interactions; Neodymium magnets; Entanglement; quantum magnetism; Permanent magnets; Nd2Fe14B; neutron scattering

Lay Summary (French)

Lead
L’étude du magnétisme s’étend des connaissances fondamentales en mécanique quantique aux applications omniprésentes de la technologie moderne. D'une part, les matériaux magnétiques constituent des arènes idéales pour développer et tester de nouveaux concepts fondamentaux en physique de l'état solide et en statistique, tandis que les aimants permanents et le stockage de données magnétiques sont des applications technologiques importantes.
Lay summary

Ce projet de recherche SNF vise 4 sujets passionnants du matériaux magnétiques:

A Le modèle 2D Heisenberg fondamentale sur des réseaux carrés, focalise sur les spectres d'excitations et son extension à non dopé et cuprates faiblement dopées

B Skyrmions - objets magnétiques émergents, qui, dans le composant magnétoélectrique Cu2OSeO3 peut être contrôlé par des champs électriques

C Magnetisme a couplage dipolaire dans les systèmes modèles LiREF4, en fournissant des exemples de criticité classique et quantique, réduction dimensionnelle, l'enchevêtrement électronique nucléaire, etc.

D Aimants permanentes : Nd2Fe14B est le matériau magnétique le plus performante connu, mais comment les propriétés est dérive des interactions atomiques n’est pas encore détermine. Nous cherchons a établir cette modèle microscopique du Nd2Fe14B et des autres aimants permanentes.

Direct link to Lay Summary Last update: 29.09.2019

Lay Summary (English)

Lead
The study of magnetism spans from fundamental quantum mechanical insights to ubiquitous applications in modern technology. On one hand, magnetic model materials provide ideal arenas for developing and testing new fundamental concepts in solid-state and statistical physics, on the other hand permanent magnets and magnetic data-storage are important technological applications.
Lay summary

This SNF Research Project targets 4 exciting topics in from magnetism:

A The fundamental 2D Heisenberg model on square and related lattices, ad-vancing understanding of the excitation spectrum and its extension to undoped and weakly doped cuprates

B Skyrmions – emergent magnetic objects, which in the magnetoelectric compound Cu2OSeO3 can be controlled by electric fields

C Dipolar coupled magnetic model systems LiREF4, providing examples of classical and quantum criticality, dimensional reduction, electronic-nuclear entanglement etc.

D Permanent magnets, while used everywhere in technology, Nd2Fe14B, is not well understood at the microscopic level. We will work towards such microscopic understanding of its magnetic properties.

Direct link to Lay Summary Last update: 29.09.2019

Responsible applicant and co-applicants

Employees

Associated projects

Number Title Start Funding scheme
166298 Quantum Magnetism - Checkerboards, Skyrmions and Dipoles 01.06.2016 Project funding (Div. I-III)
198101 ExtremeP: A Joint Pressure Capability for Complementary Neutron and Muon Experiments on Quantum Materials 01.04.2021 R'EQUIP
189644 Versatile high sensitivity and throughput magnetometer for quantum, functional and applied materials 01.03.2020 R'EQUIP

Abstract

Magnetic materials and phenomena remain at the forefront of condensed matter physics. On one hand, they provide an ideal arena for developing and testing new fundamental concepts in solid-state and statistical physics, on the other hand magnetic materials play crucial roles in modern technology from data-storage to windmills.Building on our ongoing research we propose a project composed of four pillars:A Checkerboards - The fundamental 2D Heisenberg model on square and related lattices, advancing understanding of the excitation spectrum and its extension to undoped and weakly doped cupratesB Dipolar coupled magnetic model systems LiREF4, providing examples of classical and quantum criticality, dimensional reduction, electronic-nuclear entanglement etc. In addition to the fundamental interest, our long term goal is coherent control of quantum entangled states in these systems.C Skyrmions - emergent magnetic objects, which in the magnetoelectric compound Cu2OSeO3 can be controlled by electric fields. In addition to fundamental properties of the skyrmion lattice, our ambition is a proof of concept of all electric writing, reading and erasing of skyrmions.D Permanent magnets - with over 50'000 tonnes produced annually, neodymium permanent magnets are everywhere in society. Yet, to date no microscopic model exists for this compound. Applying modern neutron spectroscopy in combination with ab initio calculations we shall establish such a microscopic model.The sub-projects will be propelled by a PhD student. Each student will each acquiring their specialization in respectively scattering techniques, imaging and low-temperature measurements, which they combine in a horizontal cross-subject team structure.
-