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Curriculum vitÔ
´ Olivier CEPAS Charg´ de recherche CNRS (CR2 since Jan. 2006) e Institut N´ eel D´ epartement Mati` condens´ et basses temp´ ere ee eratures 25 rue des Martyrs BP 166 38042 Grenoble cedex 9 Date of Birth : 16 May 1974 Nationality : French

Professional employment
­ 10/2008- Institut N´el, Grenoble. e ­ 01/2006-09/2008 CNRS permanent position at the Laboratoire de Physique Th´ eorique de la mati` condens´ Universit´ Pierre-et-Marie-Curie, Paris 6. ere ee, e ­ 01/2004-12/2005 Post-doc at the Institut Laue Langevin, Grenoble, France. ­ 09/2002-12/2003 Post-doc at the Indian Institute of Science, Bangalore, India. ­ 01/2001-08/2002 Research associate, University of Queensland, Australia.

Education
­ 1997-2000 : Ph.D. University Joseph Fourier, Grenoble. "Effects of the Magnetic Anisotropic Interactions on the Low-Dimensional Oxides" Adviser : T. Ziman, Institut Laue Langevin, defended in Oct. 2000. ­ 1996-1997 : DEA (beginning graduate school) in theoretical physics at the Ecole normale sup´ erieure de Lyon. Thesis : "Canonical ly invariant formulation of Langevin and FokkerPlanck equations". Adviser : J. Kurchan. ­ 1994-1996 : Undergraduate at the University of Paris 6 (Magist` e). er ­ 1992-1994 : Undergraduate at the Classes pr´ eparatoires aux grandes ´ ecoles, Paris.

Miscellaneous
­ Member of the "Commission des sp´ ecialistes" section 28, Universit´ Paris XI, Orsay e (2007-2008). ­ Teaching : 230 hours for undergraduate students at the University of Grenoble (19972000). ­ Languages : french (native), english, and russian (notions). 1


Conferences and Workshops
1. June 1998 : Summer School at Aussois on Strongly Correlated Systems, France. 2. Sept. 1998 : Workshop at the Institut Laue Langevin, Polarized Neutrons for Condensed Matter Investigations, France. Poster presentation : "Inelastic neutron crosssection for spin waves in the non-chiral spiral". 3. Oct. 1998 : Workshop at the Max-Planck-Institut of Dresden (Germany), Electronic and Magnetic Properties of Novel Transition Metal Compounds. Poster presentation : "Inelastic neutron cross-section for spin waves in the non-chiral spiral". 4. 20-21 Sept. 2000 : Colloquium on Strongly Correlated Systems, Toulouse (France). Invited Talk : "Dzyaloshinski-Moriya Interaction in the Two-Dimensional System SrCu2 (BO3 )2 ". 5. Sept. 2000 : Summer School at Aussois on Strongly Correlated Systems, France. Poster presentation : "Selection rules for optical transitions in spin-gapped systems". 6. 21 Nov. 2000 : Talk at the Laboratory L´ Brillouin, CEA Saclay (France) : "Effects eon of the Magnetic Anisotropic Interactions on the Low-Dimensional Oxydes." 7. 10-14 Sept. 2001 : The fourth international symposium on crystalline organic metals, superconductors and ferromagnets, Hokkaido (Japan), Poster presentation : "Magnetic field induced superconductivity in organic materials with local magnetic moments". 8. 3-8 Nov. 2001 : 25th international conference on condensed matter theories, Gordon Godfrey Conference, Canberra (Autralia). Invited Talk : "Magnetic field induced superconductivity in organic materials with local magnetic moments". 9. 13 Nov. 2001 : Departmental Seminar, "Quantum magnetism in low dimensions". 10. 20-22 Nov. 2001 : Invited for the french-japanese colloquium on "Quantum properties of low dimensional antiferromagnets", Fukuoka (Japan). 11. 26 Nov. 2001 : Talk at JAERI, Tokai (Japan) : "Dzyaloshinski-Moriya interactions in the 2d spin gap system SrCu2 (BO3 )2 ". 12. Sept. 2002 : Two introductory talks on low-dimensional quantum magnetism and anisotropies, Bangalore. 13. 2-4 Jan. 2003 : Invited talk at the conference, "India and abroad" : "Phase Transitions in the pyrochlore system", Kolkata. 14. 2 May 2002 : Talk at the Laboratoire de Physique Th´ eorique et Mod` Statistiques, eles Orsay (Paris) : "The magnetism of SrCu2 (BO3 )2 : beyond the Shastry-Sutherland model." 15. 2003. Talks Phase Transitions in the frustrated pyrochlore system. ­ Centre de Physique Mol´ eculaire Optique et Hertzienne (Bordeaux, 19/03) ­ Institut Non Lin´ eaire de Nice (Nice, 21/03) ­ Institut Laue Langevin (Grenoble, 04/04) 2


­ Laboratoire de Physique des Solides (Orsay, 16/04) ­ Laboratoire de Physique Th´ eorique (Toulouse, 17/04). 16. 3 March 2004. Talk CORMAT, Laboratoire Louis N´ (Grenoble) : eel Magnetic order in the dipolar pyrochlores. 17. 10 May 2004. Talk at the ILL : Half-Fil led Manganites : the effect of the magneticfield. 18. 21-24 July 2004. Invited talk, French-Japanese Colloquium, "Complex Quantum Systems" (Grenoble). Phase Transitions in the dipolar pyrochlore antiferromagnets : the examples of Gd2 Ti2 O7 and Gd2 Sn2 O7 . 19. 30 Nov. - 3 Dec. 2004 : Invited talk. International Symposium on Quantum Spin Systems (QSS04) (Hayama, Japon). Modified Spin-Wave Theory for Nano-magnets. 20. 31 Jan. 2005 : Talk at the Physics Department, Indian Institute of Science (Bangalore) : Modified Spin-Wave Theory for Nano-magnets : Application to the Keplerate Giant Molecule Mo72 Fe30 . 21. 4 Feb. 2005 : Talk at the Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur (Bangalore) : Competing Interactions and Phases in Half-Doped Manganites. 22. 3 March 2005 : Talk at the Laboratoire de Physique Th´ eorique (ENS Paris) : Modified spin-wave theory for nanomagnets : Application to the giant Keplerate molecule Mo72 Fe30 . 23. 3 March 2005 : Talk at the Laboratoire de Physique Th´ eorique des Liquides (Jussieu) : Two examples of frustrated magnetic states. 24. 4 March 2005 : Talk at the Laboratoire CRISMAT (Caen) : Competing interactions in half-doped manganites. 25. 21-25 March 2005 : March Meeting of the APS (Los Angeles). Contributed talk : Magnetic Orders and Fluctuations in the Dipolar Pyrochlore Antiferromagnet. 26. 1 April 2005 : Talk at the University of California (Santa-Cruz) : Spin Correlations, Degeneracies, and Dynamics of the Giant Keplerate Molecule Mo72 Fe30 . 27. 27 November 2005 : Talk at the Hong-Kong University of Science and Technology : Degeneracy, fluctuations and magnetic order in the Dipolar Pyrochlore Antiferromagnet. 28. 26-27 January 2006 : Journ´ de la physique statistique, ESPCI, Paris. Corr´ ees elations, d´ g´ ´ escences et dynamique des supramol´ e ener ecules magn´ etiques. 29. 16 May 2006 : ILL-Belgian Theory Groups Meeting (Grenoble), Frustrated supramolecular magnets. 30. 05 June - 24 June 2006 : Les Houches summer school on "Quantum magnetism". 31. 11 - 13 January 2007 : International workshop on "Mobile fermions and bosons on frustrated lattices". Poster presentation : "Magnon dispersion and anisotropies in SrCu2 (BO3 )2 ", Dresden. 3


32. 21 - 23 May 2007 : Invited talk for the workshop "New developments in ESR of strongly correlated systems", Institute for Solid State Physics, Tokyo. Title : "Do we need dynamical spin anisotropies ?" 33. 7 - 12 September 2008 : Talk at the international conference on Highly Frustrated Magnetism (HFM). Title : "Quantum phases in the Kagome antiferromagnet".

List of publications
1. O. C´ epas and J. Kurchan, Canonical ly invariant formulation of Langevin and Fokker-Planck equations Eur. Phys. J. B 2, 221 (1998). 2. T. Sakai, O. C´ epas, and T. Ziman, An Electron Spin Resonance Selection Rule for Spin-Gapped Systems J. Phys. Soc. of Jpn., 69, 3521 (2000). 3. B. Grenier, O. C´ epas, L. P. Regnault, J. E. Lorenzo, T. Ziman, J. P. Boucher, A. Hiess, T. Chatterji, J. Jegoudez and A. Revcholevschi, Charge Ordering and Spin Dynamics in NaV2 O5 Phys. Rev. Lett. 86, 5966 (2001). 4. O. C´ epas, K. Kakurai, L. P. Regnault, J. P. Boucher, T. Ziman, N. Aso, M. Nishi, H. Kageyama, and Y. Ueda, Dzyaloshinski-Moriya Interaction in the 2d Spin Gap System SrCu2 (BO3 )2 Phys. Rev. Lett. 87, 167205 (2001). 5. O. C´ epas, R. H. McKenzie, J. Merino, Magnetic-field-induced superconductivity in layered organic molecular crystals with localized magnetic moments Phys. Rev. B 65, 100502R (2002). 6. O. C´ epas and T. Ziman, Static and Dynamical Dzyaloshinski-Moriya Interactions in gapped spin systems in Quantum Properties of Low-Dimensional Antiferromagnets, p. 175-182, Edited by Y. Ajiro and J.-P. Boucher (Kyushu University Press, Fukuoka, 2002). 7. K. Kakurai, N. Aso, K. Nukui, M. Nishi, H. Kageyama, Y. Ueda, H. Kadowaki, and O. C´ epas, Inelastic Neutron Scattering Experiment on Dzyaloshinski-Moriya Interaction in SrCu2 (BO3 )2 in ibid., p. 102-108 (2002). 4


8. O. C´ epas, T. Sakai and T. Ziman, Dynamics, Selection Rules and Dzyaloshinski-Moriya interactions in Strongly Frustrated Magnets Prog. Theor. Phys. Suppl. 145, 43 (2002). 9. O. C´ epas and R. H. McKenzie, Electric-field-induced Mott Insulating states in organic field-effect transistors, Phys. Rev. B 66, 214528 (2002). 10. O. C´ epas and B. S. Shastry, Field-Driven Transitions in the Dipolar Pyrochlore Antiferromagnet Gd2 Ti2 O7 Phys. Rev. B 69, 184402 (2004). 11. O. C´ epas and T. Ziman, Theory of phonon-assisted "forbidden" optical transitions in spin-gapped systems, Phys. Rev. B 70, 024404 (2004). 12. O. C´ epas and T. Ziman, Modified Spin-Wave Theory for Nanomagnets : Application to the Keplerate Molecule Mo72 Fe30 Prog. Theor. Phys. Suppl. 159, 280 (2005). 13. O. C´ epas, H.R. Krishnamurthy, and T.V. Ramakrishnan, Doping and Field-Induced Metal-Insulator Transitions in Half-Fil led Manganites Phys. Rev. Lett. 94, 247207 (2005). 14. O. C´ epas, A. P. Young, B. S. Shastry, Degeneracy and Strong Fluctuation-Induced First-Order Transition in the Dipolar Pyrochlore Phys. Rev. B 72, 184408 (2005). 15. O. C´ epas, H.R. Krishnamurthy, and T.V. Ramakrishnan, Instabilities in Half-Fil led Manganites, Effect of the Magnetic-Field and Doping Phys. Rev. B 73,035218 (2006). 16. Y. F. Cheng, O. C´ epas, P. W. Leung and T. Ziman, Magnon dispersion and anisotropies in SrCu2 (BO3 )2 , Phys. Rev. B 75, 144422 (2007). 17. G. Bouzerar and O. C´ epas Effect of correlated disorder on the magnetism of double-exchange systems, Phys. Rev. B 76, 020401(R) (2007). 18. G. Bouzerar, R. Bouzerar, and O. C´ epas Superexchange induced canted ferromagnetism in dilute magnets, Phys. Rev. B 76, 144419 (2007). 5


19. O. C´ epas, J. O. Haerter, and C. Lhuillier Detection of weak emergent broken-symmetries of the kagome antiferromagnet by Raman spectroscopy, Phys. Rev. B 77, 172406 (2008). 20. O. C´ epas, C. M. Fong, P. W. Leung, and C. Lhuillier Quantum phase transition induced by Dzyaloshinskii-Moriya in the kagome antiferromagnet, accepted for publication as a rapid communication, Physical Review B (oct. 2008).

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