###### Home

Hi !

I’m Ludovic, a CNRS researcher working in the Condensed Matter Theory group of the LOMA in Bordeaux. Before joining CNRS, I worked in Okinawa, Oxford, Dresden and Lyon.

We are interested in what happens when electrons are not happy to live together in a crystal. More precisely, in some materials, all interactions between spins cannot be satisfied at the same time. This leads to what is called magnetic frustration and strongly hinders the system to order on long length scales. In our everyday life, it would be the same as if a cup of water would never freeze, even in the middle of Antarctica !

For scientists, frustration has opened a window to explore some of the hidden properties of matter at very low temperatures, which is where quantum mechanics rules. We spend most of our time looking through this window, trying to make sense of what we see. The absence of order often leads to persistent fluctuations, paradoxically coupled to strong magnetic correlations. These phases, called “spin liquids”, can often be described rather beautifully by emergent gauge field theories, making contact with a physics usually attached to high energy. In this field, we are especially interested in emergent phenomena (quasi-particles, extended fractal structures …), topological phases, exotic phase transitions and out-of-equilibrium dynamics, to cite but a few. Our research often sits at the frontier between Condensed Matter and Statistical Physics.

Photo by Letizia Diamante, OIST / CC BY 2.0

If you want to know more, please find below a few articles and videos made by science journalists and editors who have done a great job explaining our research:

- Interview (video) of Quantum Matter Bordeaux for APS TV (2022)
- Interview (video) of Nic Shannon, Han Yan and myself for APS TV (2020)
- “A Recipe for Finding Fractons” by Katherine Wright (Physics magazine, 2020)
- “Man versus machine: can AI do science?” by Dani Ellenby (OIST, 2020)
- “A Magnet From the Bizarro World” by Yuen Yiu (Inside Science, 2017)
- “Spin Liquid on a peak” by Greta Keenan (OIST, 2016)
- “The Quest for Spin Liquids” by Rebecca Hofland (OIST, 2016)
- “Magnetic Monopoles: Crystal Clear” by Letizia Diamante (OIST, 2015)
- “
*Premiers monopôles magnétiques*” by Franck Daninos (La Recherche, 2010), in french - “Hunting the mysterious monopole” by Eugenie Reich (New Scientist, 2009)
- “Trolling for poles” (Nature Research Highlights, 2009)

###### CV

#### Employment history

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since 2017

CNRS researcher

*Laboratoire Onde et Matière d’Aquitaine*

University of Bordeaux, France

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2013 – 2016

Group leader

Okinawa Institute of Sci. & Tech.

Japan

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2012

Postdoc

Okinawa Institute of Sci. & Tech.

Japan

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2009 – 2011

Postdoc

Max Planck Institute (MPI-PkS)

Dresden, Germany

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2006 – 2009

PhD student and Teaching assistant

ENS Lyon

France

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2002 – 2006

Normalien (civil-servant student)

ENS Lyon

France

#### Long visits

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2022

1 month

IIT Madras

Chennai, India

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2019

1 month

University of Gakushuin

Tokyo, Japan

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since 2017

visiting position

OIST

Okinawa, Japan

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2015

1 month

Ecole Normale Supérieure of Lyon

France

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2012

8 months

University of Oxford

UK

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2010

1 month

University of Waterloo

Canada

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2009

1 month

University of Waterloo

Canada

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2007

4 months

University of Oxford

UK

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2006

1 month

State University of Campinas

Brazil

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2006

4 months, intern

University Pierre & Marie Curie

Paris, France

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2004

3 months, intern

State University of Campinas

Brazil

#### Responsibilities

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Since 2019: Founder of Quantum Matter Bordeaux. Our goal is to structure the local community of researchers in quantum mechanics, creating a synergy between chemists, physicists, applied and computer scientists.

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2019 – 2024: Member of the “Conseil National des Universités” (CNU) in section 29 “Constituants Elémentaires”.

#### Recognitions

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2020

Interview in Okinawa by APS TV for the March Meeting as part of the collaboration with the group of Nic Shannon.

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2015

Our work on Signature of magnetic monopole and Dirac string dynamics in spin ice is one of the 10 featured articles for the 10-year anniversary of Nature Physics.

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2010

Research on magnetic monopoles in spin ice, including ours, was highlighted among the 10 scientific discoveries of 2009 by the French popular science magazine “La Recherche”.

#### Fundings

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2019 – 2021 (3 years): Principal Investigator of the project between France and Japan

*Manipulating Fractionalised Excitations in Spin Liquids*

funded by the CNRS (“Projet International de Coopération Scientifique” – PICS).

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2019 – 2023 (4.5 years): Principal Investigator of the project

*Designing frustration: surface effects and disorder*

funded by the French National Research Agency (ANR).

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2014 – 2017 (3 years): Principal Investigator of the project

*Lattice and Charge Engineering of Spin Ice*

funded by the Japan Society for the Promotion of Science (*Kakenhi*, JSPS),

in collaboration with Masafumi Udagawa from Gakushuin University in Tokyo.

#### Teaching

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2013 – 2016 (20-30h/year)

Master course in Advanced Statistical Mechanics

OIST, Japan

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2006 – 2009 (44h/year)

Lab works in Electronics and Thermodynamic (Master, *Agrégation*)

ENS Lyon, France

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2007 – 2009 (30h/year)

Tutorials in Quantum Mechanics (Licence)

ENS Lyon, France

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2005

Master Degree in Education (*Agrégation de Physique*)

###### Publications

You can find my publication details on Google Scholar

### Book

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Spin Ice (2021)

edited by Masafumi Udagawa & Ludovic Jaubert

Springer Series in Solid-State Sciences **197**

It is a 500-page book with 16 chapters written by 22 authors.

### Preprints

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41. arXiv:2206.00547

Tristan Lugan, Ludovic D.C. Jaubert, Masafumi Udagawa & Arnaud Ralko

Schwinger boson theory of the J1,J2=J3 kagome antiferromagnet

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40. arXiv:2203.08780

Rajah Nutakki, Richard Röß-Ohlenroth, Dirk Volkmer, Anton Jesche, Hans-Albrecht Krug von Nidda, Alexander A. Tsirlin, Philipp Gegenwart, Lode Pollet & Ludovic D. C. Jaubert

Frustration on a centred pyrochlore lattice in metal-organic frameworks

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39. arXiv:2202.11085

Allen Scheie, Owen Benton, Mathieu Taillefumier, Ludovic D.C. Jaubert, Gabriele Sala, Niina Jalarvo, Seyed M. Koohpayeh & Nic Shannon

Dynamical scaling as a signature of multiple phase competition in Yb2Ti2O7

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38. arXiv:2202.06993

H. Diego Rosales, Flavia A. Gómez Albarracín, Pierre Pujol & Ludovic D. C. Jaubert

A skyrmion fluid and bimeron glass emerging from competition with a chiral spin liquid

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37. arXiv:2112.01362

Ankur Dhar, Ludovic D. C. Jaubert, Cathal Cassidy, Tsumoru Shintake & Nic Shannon

Observing Magnetic Monopoles in Spin Ice using Electron Holography

### Publications

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36. accepted for publication in Physical Review Research [arXiv]

Anjana M. Samarakoon, Andre Sokolowski, Bastian Klemke, Ralf Feyerherm, Michael Meissner, R. A. Borzi, Feng Ye, Qiang Zhang, Zhiling Dun, Haidong Zhou, T. Egami, Ludovic Jaubert, Claudio Castelnovo, Roderich Moessner, S. A. Grigera & D. Alan Tennant

Structural magnetic glassiness in spin ice Dy2Ti2O7

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35. Proceedings of the National Academy of Sciences (USA) **119**, e2117453119 (2022) [arXiv]

Anjana M. Samarakoon, S. A. Grigera, D. Alan Tennant, Alexander Kirste, Bastian Klemke, Peter Strehlow, Michael Meissner, Jonathan N. Hallen, Ludovic Jaubert, Claudio Castelnovo & Roderich Moessner

Anomalous magnetic noise in an imperfectly flat landscape in the topological magnet Dy2Ti2O7

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34. Physical Review Letters **127**, 277206 (2021) [arXiv]

D. R. Yahne, D. Pereira, L. D. C. Jaubert, L. D. Sanjeewa, M. Powell, J. W. Kolis, Guangyong Xu, M. Enjalran, M. J. P. Gingras & K. A. Ross

Understanding Reentrance in Frustrated Magnets: the Case of the Er2Sn2O7 Pyrochlore

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33. Journal of Low Temperature Physics **201**, 710 (2020) [arXiv]

E. Lhotel, L.D.C. Jaubert & P.C.W. Holdsworth

Fragmentation in Frustrated Magnets: A Review

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32. Physical Review Letters **124**, 127203 (2020) [arXiv]

H. Yan, O. Benton, L.D.C. Jaubert & N. Shannon

Rank-2 U(1) spin liquid on the breathing pyrochlore lattice

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31. Physical Review Research **1**, 033147 (2019) [arXiv]

T. Lugan, L.D.C. Jaubert & A. Ralko

Topological nematic spin liquid on the square kagome lattice

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30. Physical Review B **100**, 174408 (2019) [arXiv]

Jonas Greitemann, Ke Liu, L.D.C. Jaubert, Han Yan, Nic Shannon & Lode Pollet

Identification of emergent constraints and hidden order in frustrated magnets using tensorial kernel methods of machine learning

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29. Physical Review B **98**, 144446 (2018) [arXiv]

T. Mizoguchi, L.D.C. Jaubert, R. Moessner & M. Udagawa

Magnetic clustering, half-moons, and shadow pinch points as signals of a proximate Coulomb phase in frustrated Heisenberg magnets

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28. Physical Review Letters **121**, 067201 (2018) [arxiv]

Owen Benton, L.D.C. Jaubert, Rajiv Singh, Jaan Oitmaa, Nic Shannon

Quantum Spin Ice with Frustrated Transverse Exchange: From a π-Flux Phase to a Nematic Quantum Spin Liquid

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27. Physical Review X **7**, 041057 (2017) [arxiv]

M. Taillefumier, O. Benton, H. Yan, L.D.C. Jaubert, N. Shannon

Competing spin liquids and hidden spin-nematic order in spin ice with frustrated transverse exchange

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26. Physical Review B **96**, 205126 (2017) [arxiv]

Karim Essafi, Owen Benton, L.D.C. Jaubert

Generic nearest-neighbor kagome model: XYZ and Dzyaloshinskii-Moriya couplings with comparison to the pyrochlore-lattice case

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25. Physical Review Letters **119**, 077207 (2017) [arxiv]

T. Mizoguchi, L.D.C. Jaubert & M. Udagawa

Clustering of Topological Charges in a Kagome Classical Spin Liquid

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24. Journal of Physics: Condensed Matter **29**, 315802 (2017) [arxiv]

K. Essafi, L.D.C. Jaubert & M. Udagawa

Flat bands and Dirac cones in breathing lattices

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23. Physical Review Letters **118**, 207206 (2017) [arxiv]

L.D.C. Jaubert , T. Lin, T.S. Opel, P.C.W. Holdsworth & M.J.P. Gingras

Spin Ice Thin Film: Surface Ordering, Emergent Square Ice and Strain Effects

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22. Physical Review B **95**, 094422 (2017) [arxiv]

H. Yan , O. Benton, L.D.C. Jaubert & N. Shannon

Theory of multiple-phase competition in pyrochlore magnets with anisotropic exchange, with application to Yb2Ti2O7, Er2Ti2O7 and Er2Sn2O7

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21. Physical Review B **94**, 224413 (2016) [arxiv]

D.T. Liu, F.J. Burnell, L.D.C. Jaubert & J.T. Chalker

Classical spin liquids in stacked triangular lattice Ising antiferromagnets

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20. Physical Review B **94**, 104416 (2016) [arxiv]

M. Udagawa, L.D.C. Jaubert, C. Castelnovo & R. Moessner

Out-of-equilibrium dynamics and extended textures of topological defects in spin ice

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19. Physical Review B **94**, 014429 (2016) [arxiv]

R. Pohle, O. Benton, & L.D.C. Jaubert

Reentrance of disorder in the anisotropic shuriken Ising model

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18. Nature Communications **7**, 11572 (2016) [arxiv]

O. Benton, L.D.C. Jaubert, H. Yan & N. Shannon

A spin-liquid with pinch-line singularities on the pyrochlore lattice

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17. Nature Communications **7**, 10297 (2016) [arxiv]

K. Essafi, O. Benton, L.D.C. Jaubert

A Kagome Map of Spin Liquids from XXZ to Dzyaloshinskii-Moriya Ferromagnet

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16. Physical Review Letters **115**, 267208 (2015) [arxiv]

L.D.C. Jaubert, O. Benton, J.G. Rau, J. Oitmaa, R.R.P. Singh, N. Shannon & M.J.P. Gingras

Are mulitphase competition & order-by-disorder the keys to understanding Yb2Ti2O7 ?

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15. Spin **5**, 1540005 (2015) [arxiv]

L.D.C. Jaubert

Monopole holes in a Partially Ordered Spin Liquid

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14. Physical Review B **91**, 214422 (2015) [arxiv]

L.D.C. Jaubert & R. Moessner

Multiferroicity in spin ice: Towards magnetic crystallography of Tb2Ti2O7 in a field

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13. Physical Review X **4**, 011007 (2014) [arxiv]

M. Brooks-Bartlett, S.T. Banks, L.D.C. Jaubert, A. Harman-Clarke & P.C.W. Holdsworth

Magnetic Moment Fragmentation and Monopole Crystallization

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12. Journal of Physics: Condensed Matter **25**, 386002 (2013) [arxiv]

L. Bovo, L.D.C. Jaubert, P.C.W. Holdsworth & S.T. Bramwell

Crystal Shape-Dependent Magnetic Susceptibility and Curie Law Crossover in the Spin Ices Dy2Ti2O7 and Ho2Ti2O7

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11. Physical Review X **3**, 011014 (2013) [arxiv]

L.D.C. Jaubert, M.J. Harris, T. Fennell, R.G. Melko, S.T. Bramwell & P.C.W. Holdsworth

Topological Sector Fluctuations and Curie Law Crossover in Spin Ice

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10. Physical Review B **85**, 054425 (2012) [arxiv]

L.D.C. Jaubert, S. Piatecki, M. Haque & R. Moessner

Itinerant electrons in the Coulomb phase

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9. Physical Review Letters **107**, 177202 (2011) [arxiv]

L.D.C. Jaubert, M. Haque & R. Moessner

Analysis of a fully packed loop model arising in a magnetic Coulomb phase

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8. Journal of Physics: Condensed Matter **23**, 164222 (2011) [arxiv]

L.D.C. Jaubert & P.C.W. Holdsworth

Magnetic Monopole Dynamics in Spin Ice

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7. Physical Review Letters **105**, 087201 (2010) [arxiv]

L.D.C. Jaubert, J.T. Chalker, P.C.W. Holdsworth & R. Moessner

Spin ice under pressure: symmetry enhancement and infinite order multicriticality

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6. Nature Physics **5**, 258-261 (2009) [arxiv]

L.D.C. Jaubert & P.C.W. Holdsworth

Signature of magnetic monopole and Dirac string dynamics in spin ice

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5. Journal of Physics: Conference Series **145**, 012024 (2009) [arxiv]

L.D.C. Jaubert, J.T. Chalker, P.C.W. Holdsworth & R. Moessner

A three dimensional Kasteleyn transition in spin ice

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4. Physics Review Letters **100**, 067207 (2008) [arxiv]

L.D.C. Jaubert, J.T. Chalker, P.C.W. Holdsworth & R. Moessner

Three-Dimensional Kasteleyn Transition: Spin Ice in a [100] Field

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3. Journal of Statistical Mechanics P05001 (2007) [arxiv]

L.D.C. Jaubert, C. Chamon, L.F. Cugliandolo & M. Picco

Growing dynamical length, scaling and heterogeneities in the 3d Edwards-Anderson model

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2. Physica Scripta **75**, 363-373 (2007) [arxiv]

L.D.C. Jaubert & M.A.M. de Aguiar

Semiclassical tunnelling of wavepackets with real trajectories

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1. Journal of Physics A **38**, 4645-4664 (2005) [arxiv]

M.A.M. de Aguiar, M. Baranger, L. Jaubert, F. Parisio & A.D. Ribeiro

Semiclassical propagation of wavepackets with complex and real trajectories

### Ph.D. thesis

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Ecole Normale Supérieure de Lyon

Topological Constraints and Defects in Spin Ice

###### Talks & Events

#### Forthcoming

Nov. 2022 | Herzberg

Oct. 2022 | Bordeaux

“Novel Phases of Matter in Frustrated Magnets”

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Oct. 2022 | San Sebast.

Place: Donostia International Physics Center (San Sebastian)

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Sep. 2022 | Bangalore

“Frustrated Metals and Insulators”

Place: International Centre for Theoretical Sciences

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Aug. 2022 | Chennai

#### Organised events

Jun. 2022 | Paris

Place:

*Campus des Cordeliers*

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Dec. 2021 | Lyon

Place: ENS Lyon (hybrid)

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Dec. 2020 | online

Oct. 2020 | Bordeaux

Place: University of Bordeaux

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Feb. 2020 | Bordeaux

Aug. 2018 | Grenoble

“Emergent Phenomena in Frustrated Magnetism” at the bi-annual conference of the French Physical Society

*Journée de la Matière Condensée*

Place: University of Grenoble-Alpes

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Apr. 2018 | Saclay

French Pyrochlore Magnets meeting

Place: University Paris-Saclay (

*Laboratoire de Physique des Solides*)

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#### Invitations

Nov. 2019|Santa Barbara

Oct. 2019 | Daejeon

Place: Institute for Basic Science – Center for Theoretical Physics of Complex Systems

Talk: How to characterise spin liquids ?

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Oct. 2019 | Caen

*Magnétisme*” of the GdR MEETICC (French research consortium)

Place: University of Caen – Normandy

Talk: Theory and Models

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Jun. 2019 | Lorraine

Place: Abbey of

*Prémontrés*

Talk: Order-by-disorder in frustrated thin films

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Mar. 2019| Boston

Talk: Neutron scattering signatures of pyrochlore spin liquids and nematic phases.

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Nov. 2018 | Dresden

Talk: Reentrant behaviour in spin liquids and half-moon patterns in neutron scattering.

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Oct. 2018 | Pohang

Place: Asia Pacific Center for Theoretical Physics

Talk: Reentrant behaviour in spin liquids

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Jun. 2018 | Zurich

Place: University of Zurich

Talk: Reentrant behaviour in spin liquids

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Aug. 2017 | Daejeon

Place: Institute for Basic Science – Center for Theoretical Physics of Complex Systems

Talk: Emergent gauge theories on pyrochlore

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Jul. 2017 | Grenoble

Place:

*Centre de Physique Théorique de Grenoble-Alpes*

Talk: Anisotropic models on the kagome lattice.

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Jun. 2017 | Waterloo

Place: Perimeter Institute

Talk: Multi-phase competition in Yb

_{2}Ti

_{2}O

_{7}and monopole crystal in Tb

_{2}Ti

_{2}O

_{7}.

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Dec. 2016 | Kolkata

Place: University of Calcutta, Saha Institute of Nuclear Physics

Talk: Fragmented spin liquids.

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Aug. 2015 | Kyoto

Place: Yukawa Institute for Theoretical Physics of the University of Kyoto

Talk: Non-equilibrium physics in spin ice.

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May. 2014 | Okinawa

Place: Okinawa Institute of Science and Technology

Talk: Exotic phases in rare-earth pyrochlore oxides.

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Feb. 2012 | Warwick

Place: University of Warwick

Talk: “Dual electrolytes” in spin-ice simulations.

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Dec. 2011 | Natal

Place: International Institute of Physics

Talk: Loop models in the Coulomb phase coupled to itinerant electrons.

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Oct. 2010 | London

Place: Royal Holloway University of London

Talk: Monopole dynamics and monopole liquids.

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Apr. 2010 | Dresden

Place: Max Planck Institute – Physics for Complex Systems

Talk: Monopole dynamics and topological phase transitions.

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Mar. 2010 | Portland

#### Seminars

Mar. 2022 | Houston

Talk: Emergent Coulomb field: seeing magnetic monopoles and a glimpse of the 4th dimension

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Mar. 2022 | Berlin

Talk: Frustrated pyrochlores: from reentrance to magnetic monopoles

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Dec. 2021 | Munich

Talk: Frustrated pyrochlores: from reentrance to magnetic monopoles

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Mar. 2020 | Oxford

Jan. 2020 | Munich

Jun. 2019 | Grenoble

May 2019 | Bordeaux

Talk: Statistical Physics of Frustration

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Apr. 2019 | Garching

Apr. 2019 | Munich

Talk: Reentrance behaviour in the vicinity of spin liquids

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Jan. 2019 | Wako

Dec. 2018 | Kyoto

Talk: Neutron scattering signatures of spin liquids.

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Dec. 2018 | Nagoya

Sep. 2017 | Okinawa

Jul. 2017 | Osaka

Jun. 2017 | Waterloo

Apr. 2017 | Cambridge

Apr. 2017 | Toulouse

Apr. 2017 | Daejeon

Talk: Fragmented spin liquids.

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Dec. 2016 | Bangalore

Jul. 2016 | Tainan

Dec. 2015 | Lyon

Dec. 2015 | Nancy

Nov. 2015 | Grenoble

Nov. 2015 | Paris

Mar. 2014 | Paris

Mar. 2014 | Tokyo

Dec. 2013 | Grenoble

Nov. 2013 | Lyon

Nov. 2013 | Lausanne

Nov. 2013 | Paris

Jun. 2013 | Cambridge

Jun. 2013 | London

Mar. 2013 | Yale

Mar. 2013 | Tokyo

Mar. 2013 | Tokyo

May 2012 | Oxfordshire

Mar. 2012 | Paris

Feb. 2012 | Yale

Feb. 2012 | London

Talk: Loop models in the Coulomb phase coupled to itinerant electrons.

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Feb. 2012 | Oxford

Oct. 2011 | Toulouse

Oct. 2011 | Paris

Feb. 2011 | Grenoble

Feb. 2011 | Saclay

Jan. 2011 | Wurzburg

Oct. 2010 | Toulouse

Oct. 2010 | Saclay

Jul. 2010 | Cologne

Talk: Monopole dynamics and topological phase transitions.

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Apr. 2010 | Hamilton

Feb. 2009 | Waterloo

Feb. 2009 | Orsay

Nov. 2008 | Dresden

Talk: Topological phase transitions.

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#### Contributed talks

Jan. 2020 | Chedigny

Talk: Identification of sin liquids and hidden order with machine learning

Place: University of Tours – Centre Val de Loire

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Jul. 2018 | Davis

Mar. 2017 | Bordeaux

*Matériaux Etats ElecTronIques Interactions et Couplages non Conventionnels*of the national research consortium (GdR) MEETICC

Talk: Emergent phenomena in spin liquids.

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Sep. 2016 | Kanazawa

3 Talks: Spin-ice thin films, anisotropic kagome models and breathing lattices.

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Sep. 2016 | Taipei

Talk: Design of spin liquids in two and three dimensions.

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Jul. 2016 | Lyon

Sep. 2015 | Kansai

3 Talks: Multi-phase competition in Yb

_{2}Ti

_{2}O

_{7}, monopole crystal in Tb

_{2}Ti

_{2}O

_{7}and a kagome map of spin liquids.

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Jul. 2015 | Barcelona

Nov. 2014 | Kyoto

Jul. 2014 | Stockholm

Talk: Multi-phase competition in Yb

_{2}Ti

_{2}O

_{7}.

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Jul. 2014 | Cambridge

Apr. 2014 | Dresden

Mar. 2014 | Denver

Nov. 2013 | Saclay

*Matériaux et Interactions en Compétition*(GdR MICO)

Talk: A generic model for pyrochlores.

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Jul. 2013 | Seoul

Mar. 2013 | Hiroshima

Talk: Dimensional reduction in Yb

_{2}Ti

_{2}O

_{7}.

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Mar. 2013 | Baltimore

May. 2012 | Dresden

Talk: Loop models in the Coulomb phase coupled to itinerant electrons.

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Mar. 2012 | Boston

Oct. 2011 | Grenoble

Talk: Loop models in frustrated magnetism.

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Mar. 2011 | Dresden

Oct. 2010 | Budapest

Talk: Topological sector fluctuations

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Jun. 2010 | Orsay

May 2009 | Lyon

Mar. 2009 | Pittsburgh

Aug. 2007 | Trieste

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###### Team

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**Piyush Anand Jeena — PhD student**

Hello, I am Piyush, PhD student at LOMA-CNRS, Bordeaux working on the topic “Designing frustration: surface effects and disorder”. I am mostly interested in condensed matter theory and my majority of the motivation towards these topics is from the time when I did an internship at LPS, Paris with Prof. Anuradha Jagannathan on Disordered systems. Besides that I enjoy watching football and esports and spend my free time playing FIFA and PUBGM with my friends.

### Ludovic JAUBERT

Laboratoire Ondes et Matière d’Aquitaine (LOMA)

351 cours de la libération

33405 Talence Cedex

**Phone **: + 33 (0)5 40 00 3732

**E-mail**: ludovic.jaubert@u-bordeaux.fr