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Quantum Magnetism - Checkerboards, Skyrmions and Dipoles

English title Quantum Magnetism - Checkerboards, Skyrmions and Dipoles
Applicant Ronnow Henrik M.
Number 166298
Funding scheme Project funding (Div. I-III)
Research institution Laboratoire de magnétisme quantique EPFL - SB - IPMC - LQM
Institution of higher education EPF Lausanne - EPFL
Main discipline Condensed Matter Physics
Start/End 01.06.2016 - 30.09.2019
Approved amount 720'000.00
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Keywords (5)

Skyrmions; Magnetism; Entanglement; quantum magnetism; neutron scattering

Lay Summary (French)

Lead
Le magnétisme quantique reste à la pointe de la matière condensée. D'une part, il offre une arène idéale pour développer et tester de nouveaux concepts fondamentaux dans l'état solide et physique statistique, d'autre part, il a un rôle central dans plusieurs classes de matériaux émergents avec de nouvelles propriétés électroniques.
Lay summary
Ce projet de recherche SNF vise trois sujets passionnants dans Magnetis quantique:

A Damiers - 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.
Direct link to Lay Summary Last update: 01.07.2016

Lay Summary (English)

Lead
Quantum magnetism remains at the forefront of condensed matter physics. On one hand, it provides the ideal arena for developing and testing new fundamental concepts in solid-state and statistical physics, on the other hand it has a pivotal role in several classes of emerging materials with new electronic properties.
Lay summary

This SNF Research Project targets three exciting topics in quantum magnetis:

A Checkerboards - 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.

Direct link to Lay Summary Last update: 01.07.2016

Responsible applicant and co-applicants

Employees

Publications

Publication
Strain-engineering Mott-insulating La2CuO4
Ivashko O., Horio M., Wan W., Christensen N. B., McNally D. E., Paris E., Tseng Y., Shaik N. E., Rønnow H. M., Wei H. I., Adamo C., Lichtensteiger C., Gibert M., Beasley M. R., Shen K. M., Tomczak J. M., Schmitt T., Chang J. (2019), Strain-engineering Mott-insulating La2CuO4, in Nature Communications, 10(1), 786-786.
Exact diagonalization study of the Hubbard-parametrized four-spin ring exchange model on a square lattice
Larsen C. B., Rømer A. T., Janas S., Treue F., Mønsted B., Shaik N. E., Rønnow H. M., Lefmann K. (2019), Exact diagonalization study of the Hubbard-parametrized four-spin ring exchange model on a square lattice, in Physical Review B, 99(5), 054432-054432.
Magnetic and structural properties of Ni-substituted magnetoelectric Co4Nb2O9
Papi Hadi, Favre Virgile Yves, Ahmadvand Hossein, Alaei Mojtaba, Khondabi Mohammad, Sheptyakov Denis, Keller Lukas, Kameli Parviz, Zivkovic Ivica, Ronnow Henrik M. (2019), Magnetic and structural properties of Ni-substituted magnetoelectric Co4Nb2O9, in PHYSICAL REVIEW B, 100(13), 134408.
Direct electric field control of the skyrmion phase in a magnetoelectric insulator
Kruchkov A. J., White J. S., Bartkowiak M., Zivkovic I., Magrez A., Ronnow H. M. (2018), Direct electric field control of the skyrmion phase in a magnetoelectric insulator, in SCIENTIFIC REPORTS, 8, 10466.
In Situ Electric Field Skyrmion Creation in Magnetoelectric Cu2OSeO3
Huang Ping, Cantoni Marco, Kruchkov Alex, Rajeswari Jayaraman, Magrez Arnaud, Carbone Fabrizio, Ronnow Henrik M. (2018), In Situ Electric Field Skyrmion Creation in Magnetoelectric Cu2OSeO3, in NANO LETTERS, 18(8), 5167-5171.
Laser-Induced Skyrmion Writing and Erasing in an Ultrafast Cryo-Lorentz Transmission Electron Microscope
Berruto G., Madan I., Murooka Y., Vanacore G. M., Pomarico E., Rajeswari J., Lamb R., Huang P., Kruchkov A. J., Togawa Y., LaGrange T., McGrouther D., Ronnow H. M., Carbone F. (2018), Laser-Induced Skyrmion Writing and Erasing in an Ultrafast Cryo-Lorentz Transmission Electron Microscope, in PHYSICAL REVIEW LETTERS, 120(11), 117201.
Suppression of Magnetic Order before the Superconducting Dome in MnP
Yano Shin-ichiro, Lancon Diane, Ronnow Henrik M., Hansen Thomas C., Ressouche Eric, Qureshi Navid, Ouladdiaf Bachir, Gardner Jason S. (2018), Suppression of Magnetic Order before the Superconducting Dome in MnP, in JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 87(2), 023703.
Electronic and magnetic excitations in the half-stuffed Cu-O planes of Ba2Cu3O4Cl2 measured by resonant inelastic x-ray scattering
Fatale S., Fatuzzo C. G., Babkevich P., Shaik N. E., Pelliciari J., Lu X., McNally D. E., Schmitt T., Kikkawa A., Taguchi Y., Tokura Y., Normand B., Rønnow H. M., Grioni M. (2017), Electronic and magnetic excitations in the half-stuffed Cu-O planes of Ba2Cu3O4Cl2 measured by resonant inelastic x-ray scattering, in Physical Review B, 96(11), 115149-115149.
J1−J2 square lattice antiferromagnetism in the orbitally quenched insulator MoOPO4
Yang L., Jeong M., Babkevich P., Katukuri V. M., Náfrádi B., Shaik N. E., Magrez A., Berger H., Schefer J., Ressouche E., Kriener M., Živković I., Yazyev O. V., Forró L., Rønnow H. M. (2017), J1−J2 square lattice antiferromagnetism in the orbitally quenched insulator MoOPO4, in Physical Review B, 96(2), 024445-024445.
How skyrmion lattice forms and arranges
Huang Ping, Jayaraman Rajeswari, Murooka Yoshie, Cantoni Marco, Magrez Arnaud, Carbone Fabrizio, Ronnow Henrik (2017), How skyrmion lattice forms and arranges, in ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES, 73(S), 828-828.
Magnetic excitations from the two-dimensional interpenetrating Cu framework in Ba2Cu3O4Cl2
Babkevich P., Shaik N. E., Lancon D., Kikkawa A., Enderle M., Ewings R. A., Walker H. C., Adroja D. T., Manuel P., Khalyavin D. D., Taguchi Y., Tokura Y., Soda M., Masuda T., Ronnow H. M. (2017), Magnetic excitations from the two-dimensional interpenetrating Cu framework in Ba2Cu3O4Cl2, in PHYSICAL REVIEW B, 96(1), 014410.
Magnetic quadrupolar order in the chiral square cupola compound BaTiOCu4(PO4)(4)
Ronnow Henrik M., Babkevich Peter, Testa Luc, Kimura Kenta, Tucker Gregory S., Roessli Bertrand, Kimura Tsuyoshi (2017), Magnetic quadrupolar order in the chiral square cupola compound BaTiOCu4(PO4)(4), in ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES, 73(S), 829-829.
Magnetic Skyrmions and Skyrmion Clusters in the Helical Phase of Cu2OSeO3
Mueller Jan, Rajeswari Jayaraman, Huang Ping, Murooka Yoshie, Ronnow Henrik M., Carbone Fabrizio, Rosch Achim (2017), Magnetic Skyrmions and Skyrmion Clusters in the Helical Phase of Cu2OSeO3, in PHYSICAL REVIEW LETTERS, 119(13), 137201.
Magnetic structure of Ba(TiO)Cu-4(PO4)(4) probed using spherical neutron polarimetry
Babkevich P., Testa L., Kimura K., Kimura T., Tucker G. S., Roessli B., Ronnow H. M. (2017), Magnetic structure of Ba(TiO)Cu-4(PO4)(4) probed using spherical neutron polarimetry, in PHYSICAL REVIEW B, 96(21), 214436.
Magnetic structure and magnon dynamics of the quasi-two-dimensional antiferromagnet FePS3
Lancon D., Walker H. C., Ressouche E., Ouladdiaf B., Rule K. C., McIntyre G. J., Hicks T. J., Ronnow H. M., Wildes A. R. (2016), Magnetic structure and magnon dynamics of the quasi-two-dimensional antiferromagnet FePS3, in PHYSICAL REVIEW B, 94(21), 214407.
MnO nanoparticles as the cause of ferromagnetism in bulk dilute Mn-doped ZnO
Lancon Diane, Nilsen Goran J., Wildes Andrew R., Nemkovski Kirill, Huang Ping, Fejes Dora, Ronnow Henrik M., Magrez Arnaud (2016), MnO nanoparticles as the cause of ferromagnetism in bulk dilute Mn-doped ZnO, in APPLIED PHYSICS LETTERS, 109(25), 252405.

Associated projects

Number Title Start Funding scheme
162110 Harnessing Molecular Crystals for Quantum Magnets and Elucidating Quantum Critical Physics 01.03.2016 Bilateral programmes
146870 Quantum Magnetism - Spinons, Skyrmions and Dipoles 01.04.2013 Project funding (Div. I-III)
170773 A new high efficiency two-dimensional neutron detector for the cold-neutron diffractometer DMC at SINQ 01.11.2017 R'EQUIP
183304 Microwaves for coherent control of quantum matter and magnonic devices 01.12.2018 R'EQUIP
188648 Quantum Magnetism - from fundamentals to applications 01.10.2019 Project funding (Div. I-III)
150257 Dimensional and Anisotropy Control of Model Quantum Magnets 01.01.2014 Project funding (Div. I-III)
144972 High efficiency neutron spectrometer optimized for investigations under extreme conditions 01.01.2014 R'EQUIP
133815 Setup for studies of quantum phenomena in condensed matter systems at ultra-low temperatures in magnetic vector fields 01.04.2012 R'EQUIP
164013 Laser-heated Floating Zone Furnace for EPFL Crystal Growth Facility 01.11.2016 R'EQUIP
160765 Mott Physics Beyond the Heisenberg Model in Iridates and Related Materials 01.01.2016 Sinergia
170760 High-field THz source for pump-probe experiments at SwissFEL 01.11.2017 R'EQUIP

Abstract

Quantum magnetism remains at the forefront of condensed matter physics. On one hand, it pro-vides the ideal arena for developing and testing new fundamental concepts in solid-state and statistical physics, on the other hand it has a pivotal role in several classes of emerging materi-als with new electronic properties.Here we propose three research topics:A Checkerboards - 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 cupratesB Skyrmions - emergent magnetic objects, which in the magnetoelectric compound Cu2OSeO3 can be controlled by electric fieldsC Dipolar coupled magnetic model systems LiREF4, providing examples of classical and quan-tum criticality, dimensional reduction, electronic-nuclear entanglement etc. The three sub-projects are propelled by four PhD students (3 experimental and 1 theoretical), each acquiring their specialization in respectively scattering techniques, imaging, low-temperature measurements and theory, which they combine in a horizontal cross-subject team structure. For sub-projects A and B, special pivotal expertise in respectively theory and electron microscopy is brought in by the two co-applicants.
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