Ludovic Jaubert est membre de l’équipe Théorie de la Matière Condensée, thématique Exotic Correlated Quantum States.

Exotic Correlated Quantum States

Welcome !

I am a condensed matter theorist, working as a CNRS researcher in Bordeaux. I have previously worked in Okinawa (Japan), Oxford (UK), Dresden (Germany) and Lyon (France).

In a nutshell, I am interested in what happens when electrons are not happy to live together in a crystal.

Somewhat less colloquially, magnetic materials are made of atoms (or more precisely ions) carrying a magnetic spin. Our problem at hand is that in some of these materials, all interactions between the spins cannot always be satisfied at the same time. This leads to what is called magnetic frustration and hinders, sometimes even prevents, the system to order on long length scales. In our everyday life, it would be the same as a cup of water that 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 temperature, which is where quantum mechanics rules. I spend most of my time looking through this window, trying to make sense of what I see.

The absence of order often leads to persistent fluctuations, paradoxically coupled to strong correlations between spins and quantum entanglement. In this field, I am especially interested in emergent phenomena, spin liquids, topological phases … and more generally to the connections between Condensed Matter and Statistical Physics, such as in loop models.

Curriculum vitae

Employment history

since 2017: CNRS researcher at the LOMA, University of Bordeaux, France

2013 – 2016: Group leader at the Okinawa Institute of Science & Techonology (OIST), Japan

2012 – 2012: Postdoc at OIST, Okinawa, Japan

2009 – 2011: Postdoc at the Max Planck Institute (PkS), Dresden, Germany

2006 – 2009: Ph.D student and teaching assistant at the ENS Lyon, France

2002 – 2006: Normalien of the ENS Lyon, France (Master and last year of License)

Long visits

2015 ENS Lyon, France (1 month, guest professor)

2012 Oxford University, UK (8 months)

2010 Waterloo University, Canada (1 month)

2009 Waterloo University, Canada (1 month)

2007 Oxford University, UK (4 months)

2006 Campinas University, Brazil (1 month)

2006 Pierre & Marie Curie University, Paris, France (4 months, intern)

2004 Campinas University, Brazil (3 months, intern)

Publications

You can find my publication details on Google Scholar.
List of my publications on Hal Archive

Preprints

27.[arXiv:1706.09101]
Karim Essafi, Owen Benton, L.D.C. Jaubert
Generic nearest-neighbour kagome model: XYZ & Dzyaloshinskii-Moriya, and comparison to pyrochlore

26.[arXiv:1705.00148]
M. Taillefumier, O. Benton, H. Yan, L.D.C. Jaubert, N. Shannon
Frustrating quantum spin ice: a tale of three spin liquids, and hidden order

Publications

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

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

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

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

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

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

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

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

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

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 ?

15. Spin 5, 1540005 (2015) [arXiv]
L.D.C. Jaubert

Monopole holes in a Partially Ordered Spin Liquid
# invited paper for the special issue on “Quantum Spin Ice and Liquid in Geometrically Frustrated Magnets”

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

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

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

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

10. Physical Review B 85, 054425 (2012) [arXiv]
L.D.C. Jaubert, S. Piatecki, M. Haque & R. Moessner
Itinerant electrons in the Coulomb phase

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

8. Journal of Physics: Condensed Matter 23, 164222 (2011) [arXiv]
L.D.C. Jaubert & P.C.W. Holdsworth
Magnetic Monopole Dynamics in Spin Ice

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

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
# selected as one of the 12 featured articles for the 10-year anniversary of Nature Physics in 2015

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

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

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

2. Physica Scripta 75, 363-373 (2007) [arXiv]
L.D.C. Jaubert & M.A.M. de Aguiar
Semiclassical tunnelling of wavepackets with real trajectories

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

Ecole Normale Supérieure de Lyon (Sept. 2006 – Sept. 2009)
Topological Constraints and Defects in Spin Ice

Group members
While I have recently moved from Okinawa to Bordeaux, Karim & Rico are still based in Okinawa.

Karim Essafi (a.k.a. Obiwan) – Postdoc

I completed my PhD with Dominique Mouhanna at the University Pierre and Marie Curie in 2012. In November 2013, I joined the TQM Unit at OIST. I am interested in phase transitions and critical phenomena. During my PhD, I specialised in the study of critical phenomena using the nonperturbative renormalisation group (NPRG).  Outside of work, I enjoy playing and watching football, diving and surfing.

Rico Pohle – Ph.D student, co-supervised with Nic Shannon

I received my diploma in experimental physics from the Dresden University of Technology (Germany) in 2012. During my diploma I studied surface properties of
the unconventional pnictide superconductor LiFeAs with an Scanning Tunneling Microscope. After joining the PhD program of the Okinawa Institute of Science and Technology Graduate University (OIST) as one of its first students, I switched to theoretical physics and try to enlarge my understanding of thermodynamical and dynamical properties in spin liquids. Next to my studies I am very interested in martial arts, dancing and the exploration of the culture, history and spirit of the islands of Okinawa and Japan.

Alumni

Interns (~3 months)

2016 – Victor Drouin-Touchette (B.Sc, University of Montreal, Canada, co-supervision with Karim Essafi)
=> Graduate school at Rutgers, USA.
2015 – Maxime Garnier (Master 1, ENS Cachan, France) => Master 2 at ENS Ulm, Paris.
2013 – Valentin Raban (Master 1, ENS Lyon, France) => Ph.D with Peter Holdsworth at ENS Lyon.
2012 – Han Yan (Part III, Cambridge, UK, co-supervision with Nic Shannon)
=> long-term collaborator & Ph.D with Prof. Sugawara in string theory at OIST.

OIST Graduate school students (4 months)

2014 – Christina Lee (B.Sc Physics, Caltech, USA) => Ph.D with Nic Shannon at OIST.
2013 – Tosif Ahamed (Master Cognitive Science, Edinburgh, Scotland)
=> Ph.D at the interface between neuroscience (Prof. Maruyama) and biophysics (Prof. Stevens) at OIST.
2012 – Rico Pohle (Master Physics, Dresden) => Ph.D with Nic Shannon and me at OIST (see above).

Teaching

2015 – 2016: OIST, Japan | Master course in « Advanced Statistical Mechanics » (20 hours)

2012 – 2014: OIST, Japan | Master course in « Advanced Statistical Mechanics » (30 hours / year)

2006 – 2009: Ecole Normale Superieure of Lyon, France (64 hours / year)
Lab works (Master): electronic, thermodynamic, electromagnetism…
Quantum Mechanics tutorials (B.Sc)

2005: Master in Education: “Agrégation de Sciences Physiques”
National competitive exam, to teach at B.Sc and Highschool level

2000 – 2004: Highschool tutor

Outreach

You can find here a few articles written by science journalists about the research we have done over the years.

2016 “Spin Liquid on a peak” by Greta Keenan (OIST, Japan)

2016 “The Quest for Spin Liquids” by Rebecca Hofland (OIST, Japan)

2015 “Magnetic Monopoles: Crystal Clear” by Letizia Diamante (OIST, Japan)

2010 “Premiers monopôles magnétiques” by Franck Daninos (La Recherche, France), in french

2009 “Hunting the mysterious monopole” by Eugenie Reich (New Scientist, UK)

2009 “Trolling for poles” (Nature Research Highlights, UK)

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