Dr. Jonathan White

My principal scientific interests are in experimental Condensed Matter Physics, where I use mainly neutron scattering to attack various problems. Topics of current interest include:

• Search for novel magnetic phases in topological materials
• Topological magnetism, mainly in non-centrosymmetric lattices
• Microscopic mechanisms for magnetoelectric coupling, in both thin film and bulk materials
• Interaction between superconductivity and other orders
• Realization of challenging experiments, e.g. complex sample environments, small sample volumes, pressure experiments.
• Responsible for the SANS-I instrument at SINQ.

• Title: Discovery of new quantum effects derived from synergies between magnetism and Weyl electrons, Role: PI with N. Kanazawa (Univ. of Tokyo), Sponsor: ETHZ (Research Partnership Grant), Funds: 25 kCHF, Jun 2022- May 2023
• Title: Creation and exploration of high-density topological skyrmion phases in 4f magnets, Role: PI, Sponsor: SNSF (Project), Funds: 0.46 MCHF, Nov 2020 to Oct 2024
• Title: Discovery and Nanoengineering of Novel Skyrmion-hosting materials, Role: co-PI (with Prof. D. Grundler (EPFL, PI), Prof. O. Yazyev (EPFL, co-PI) and Prof. M. Poggio (UBasel, co-PI)), Sponsor: SNSF (Sinergia), Funds: 2.7 MCHF (personal share 0.7 MCHF), Oct 2017 to Sep 2022 - Project website hosted by EPFL
• Title: Exploration of emerging magnetoelectric coupling effects in new materials, Role: PI, Sponsor: SNSF (Project), Funds: 0.2 MCHF, Jul 2015 to Jun 2018

Full list at Publons or Google Scholar

Neutron Techniques: Flux-Line Lattice
J. White.
Chapter G1.6 in "Handbook of Superconductivity: Characterization and Applications", 2^nd Edition, Eds. D.A. Cardwell, D.C. Larbalestier, A. Braginski, CRC Press - Boca Raton, (2022)

Tuning topological spin textures in size-tailored chiral magnet insulator particles
P.R. Baral, V. Ukleev, R. Cubitt, T. LaGrange, I. Živković, H.M. Rønnow, J.S. White, and A. Magrez.
J. Phys. Chem. C 126, 11855 (2022)

Square and rhombic lattices of magnetic skyrmions in a centrosymmetric binary compound
R. Takagi, N. Matsuyama, V. Ukleev, L. Yu, J.S. White, S. Francoual, J.R.L. Mardegan, S. Hayami, H. Saito, K. Kaneko, K. Ohishi, Y. Onuki, T. Arima, Y. Tokura, T. Nakajima, and S. Seki.
Nature Communications 13, 1472 (2022)

Frustration-driven magnetic fluctuations as the origin of the low-temperature skyrmion phase in Co₇Zn₇Mn₆
V. Ukleev, K. Karube, P.M. Derlet, C.N. Wang, H. Luetkens, D. Morikawa, A. Kikkawa, L. Mangin-Thro, A.R. Wildes, Y. Yamasaki, Y. Yokoyama, L. Yu, C. Piamonteze, N. Jaouen, Y. Tokunaga, H. M. Rønnow, T. Arima, Y. Tokura, Y. Taguchi, and J.S. White
npj Quantum Materials 6, 40 (2021)

Direct Observation of the Statics and Dynamics of Emergent Magnetic Monopoles in a Chiral Magnet
N. Kanazawa^†, A. Kitaori^†, J. S. White^†, V. Ukleev, H. M. Rønnow, A. Tsukazaki, M. Ichikawa, M. Kawasaki, and Y. Tokura
Phys. Rev. Lett. 125, 137202 (2020)

Magnetism and anomalous transport in the Weyl semimetal PrAlGe: possible route to axial gauge fields
D. Destraz, L. Das, S.S. Tsirkin, Y. Xu, T. Neupert, J. Chang, A. Schilling, A.G. Grushin, J. Kohlbrecher, L. Keller, P. Puphal, E. Pomjakushina, and J.S. White
npj Quantum Materials 5, 5 (2020)

Topological magnetic phase in the candidate Weyl semimetal CeAlGe
P. Puphal, V. Pomjakushin, N. Kanazawa, V. Ukleev, D.J. Gawryluk, J.-Z. Ma, M. Naamneh, N.C. Plumb, L. Keller, R. Cubitt, E. Pomjakushina and, J.S. White
Phys. Rev. Lett. 124, 017202 (2020)

Multiple-q noncollinear magnetism in an itinerant hexagonal magnet
R. Takagi, J.S. White, S. Hayami, R. Arita, D. Honecker, H.M. Rønnow, Y. Tokura, and S. Seki
Science Advances, 4, eaau3402 (2018).

Disordered skyrmion phase stabilized by magnetic frustration in a chiral magnet
K. Karube^†, J.S. White^†, D. Morikawa, C.D. Dewhurst, R. Cubitt, A. Kikkawa, X.Z. Yu, Y. Tokunaga, T. Arima, H.M. Rønnow, Y. Tokura, and Y. Taguchi
Science Advances, 4, eaar7043 (2018).

Magnetoelectric inversion of domain patterns
N. Leo^†, V. Carolus^†, J.S. White, M. Kenzelmann, M. Hudl, P. Toledano, T. Honda, T. Kimura, S.A. Ivanov, M. Weil, Th. Lottermoser, D. Meier, and M. Fiebig
Nature 560, 466 (2018).

Coupled multiferroic domain switching in the canted conical spin spiral system Mn₂GeO₄
T. Honda^†, J.S. White^†, A.B. Harris, L.C. Chapon, A. Fennell, B. Roessli, O. Zaharko, M. Kenzelmann, and T. Kimura
Nature Communications 8, 15457 (2017).

Robust metastable skyrmions and their triangular–square lattice structural transition in a high-temperature chiral magnet
K. Karube^†, J.S. White^†, N. Reynolds, J.L. Gavilano, H. Oike, A. Kikkawa, F. Kagawa, Y. Tokunaga, H.M. Rønnow, Y. Tokura, and Y. Taguchi
Nature Materials 15, 1237 (2016).

Néel-type Skyrmion Lattice with Confined Orientation in the Polar Magnetic Semiconductor GaV₄S₈
I. Kézsmárki, S. Bordács, P. Milde, E. Neuber, L.M. Eng, J.S. White, H.M. Rønnow, C.D. Dewhurst, M. Mochizuki, K. Yanai, H. Nakamura, D. Ehlers, V. Tsurkan, and A. Loidl
Nature Materials 14, 1116 (2015).

A new class of chiral materials hosting magnetic skyrmions beyond room temperature
Y. Tokunaga, X.Z. Yu, J.S. White, H.M. Rønnow, D. Morikawa, Y. Taguchi, and Y. Tokura
Nature Communications 6, 7638 (2015).

Electric field-induced Skyrmion distortion and giant lattice rotation in the magnetoelectric insulator Cu₂OSeO₃
J.S. White, K. Prša, P. Huang, A.A. Omrani, I. Živković, M. Bartkowiak, H. Berger, A. Magrez, J.L. Gavilano, G. Nagy, J. Zang, and H.M. Rønnow
Phys. Rev. Lett. 113, 107203 (2014).

Strain-Induced Ferromagnetism in Antiferromagnetic LuMnO₃ Thin Films
J.S. White, M. Bator, Y. Hu, H. Luetkens, J. Stahn, S. Capelli, S. Das, M. Döbeli, Th. Lippert, V.K. Malik, J. Martynczuk, A. Wokaun, M. Kenzelmann, Ch. Niedermayer, and C.W. Schneider
Phys. Rev. Lett. 111, 037201 (2013).

Coupling of Magnetic and Ferroelectric Hysteresis by a Multicomponent Magnetic Structure in Mn₂GeO₄
J.S. White, T. Honda, K. Kimura, T. Kimura, Ch. Niedermayer, O. Zaharko, A. Poole, B. Roessli, and M. Kenzelmann
Phys. Rev. Lett. 108, 077204 (2012).

Fermi Surface and Order Parameter Driven Vortex Lattice Structure Transitions in Twin-Free YBa₂Cu₃O₇
J.S. White, V. Hinkov, R.W. Heslop, R.J. Lycett, E.M. Forgan, C. Bowell, S. Strässle, A.B. Abrahamsen, M. Laver, C.D. Dewhurst, J. Kohlbrecher, J.L. Gavilano, J. Mesot, B. Keimer, and A. Erb
Phys. Rev. Lett. 102, 097001 (2009).

Superconducting Vortices in CeCoIn₅: Toward the Pauli-Limiting Field
A.D. Bianchi, M. Kenzelmann, L. DeBeer-Schmitt, J.S. White, E.M. Forgan, J. Mesot, M. Zolliker, J. Kohlbrecher, R. Movshovich, E.D. Bauer, J.L. Sarrao, Z. Fisk, C. Petrović, and M.R. Eskildsen
Science 319, 177 (2008).