Current fellows

Pour nous contacter

Pour nous contacter

Jean-Marc Berroir
Directeur du Labex
directeur@phys.ens.fr

Junior Research Chairs

Chaque année, le Labex recrute troix nouveaux JRC.
Pour en savoir plus sur la procédure de recrutement et le calendrier, cliquez ici.

Master de Physique Fondamentale

L’appel à candidatures pour la session 2018/2019 est clôturé :

Pour toute question administrative concernant le master ICFP, vous pouvez nous contacter à l’adresse suivante :
applicationicfp@phys.ens.fr

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 Yashar Akrami (2018-2020)

(PhD : Oskar Klein Center, Stockholm ; Postdocs : Leiden University, Heidelberg University, University of Oslo). Dr. Akrami is a theoretical physicist and specialises in cosmology and particle physics, with a broad range of interests. He has also a strong interest in cosmological data analysis and his focus is on the interplay between cosmological observations and fundamental physics.

Dr. Akrami is particularly interested in questions related to the physics of the early universe and cosmic initial conditions, late-time cosmic acceleration and dark energy, theories of gravity on the largest scales, signatures of new physics beyond standard models of cosmology and particle physics, and implications of high energy theories (quantum gravity, string theory, supergravity) for cosmology.

On the observational side, Dr. Akrami is interested in the cosmic microwave background, large-scale structure of the universe, and statistical inference and high-performance computing techniques in cosmology and particle physics. He is currently an active member of the Planck Collaboration, Euclid Consortium, and the Square Kilometre Array (SKA).

Selected publications :
- SKA Collaboration (2018) : Cosmology with Phase 1 of the Square Kilometre Array : Red Book 2018 : Technical specifications and performance forecasts. Submitted to Publ. Astron. Soc. Austral. [arXiv:1811.02743].
- Akrami Y., Kallosh R., Linde A., Vardanyan V. (2018) : The landscape, the swampland and the era of precision cosmology. Fortsch. Phys. (2018) 1800075. [arXiv:1808.09440].
- Planck Collaboration (Akrami Y. et al.) : Planck 2018 results. X. Constraints on infation. Submitted to Astronomy & Astrophysics (A&A). [arXiv:1807.06211].
- Akrami Y., Brax P., Davis A. C., Vardanyan V. (2018) : Neutron star merger GW170817 strongly constrains doubly coupled bigravity. Phys. Rev. D97 (2018) 124010. [arXiv:1803.09726].
- Akrami Y., Kallosh R., Linde A., Vardanyan V. (2017) : Dark energy, α-attractors, and large-scale structure surveys. JCAP 1806 (2018) 041. [arXiv:1712.09693].
- Bull P. and Akrami Y. et al. (2015) : Beyond ΛCDM : Problems, solutions, and the road ahead. Phys. Dark Univ. 12 (2016) 56-99. [arXiv:1512.05356].
- Akrami Y., Hassan S. F., Konnig F., Schmidt-May A., Solomon A. R. (2015) : Bimetric gravity is cosmologically viable. Phys. Lett. B748 (2015) 37-44. [arXiv:1503.07521].
- Akrami Y., Fantaye Y., Shafieloo A., Eriksen H. K., Hansen F. K., Banday A. J., Gorski K. M. (2014) : Power asymmetry in WMAP and Planck temperature sky maps as measured by a local variance estimator. Astrophys. J. 784 (2014) L42. [arXiv:1402.0870].
- Akrami Y., Koivisto T. S., Sandstad M. (2013) : Accelerated expansion from ghost-free bigravity : a statistical analysis with improved generality. JHEP 1303 (2013) 099. [arXiv:1209.0457].
- Bringmann T., Scott P., Akrami Y. (2012) : Improved constraints on the primordial power spectrum at small scales from ultracompact minihalos. Phys. Rev. D85 (2012) 125027. [arXiv:1110.2484].
- Akrami Y., Scott P., Edsjo J., Bergstrom L. (2010) : A Profile Likelihood Analysis of the Constrained Minimal Supersymmetric Standard Model with Genetic Algorithms. JHEP 1004 (2010) 057. [arXiv:0910.3950].

Full list available at https://inspirehep.net/author/profile/Y.Akrami.2

More information regarding Yashar’s research can be found on his website : https://www.yashar-akrami.com/

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 Hilton Barbosa de Aguiar (2016-2019)

Hilton is an experimentalist working with nonlinear microscopy and spectroscopy of complex soft matter systems (colloidal science, interfacial phenomena, biomedical imaging). His PhD focused on using interface-specific nonlinear optical tools to unravel molecular level details of colloidal particle interfaces (EPFL/Lausanne, jointly with Max-Planck Institute/Stuttgart, September 2011). His post-doc activities focused on nonlinear microscopy of biological systems (Stuttgart University, Stuttgart ; Fresnel Institut, Marseille), both as an instrument developer, or in more fundamental studies on light propagation in complex media. In general, the advanced tools he uses are label-free approaches exploiting the intrinsic vibrational response of molecular systems.

JRC since September 2016, he is currently implementing a Raman microspectroscopy setup (linear and nonlinear using ultrafast laser technology). These label-free tools aim at probing soft matter systems in collaboration with LPS researchers. He is also tackling fundamental questions of light propagation in complex media jointly with LKB researchers (for biomedical imaging).

Selected publications :
- "The orientation and charge of water at the hydrophobic oil droplet–water interface".
de Aguiar, de Beer, Strader, Roke. J. Am. Chem. Soc. 132, 2122-2123 (2010)
- "Programmable single-pixel-based broadband stimulated Raman scattering".
Berto, Scotte, Galland, Rigneault, de Aguiar. Opt. Lett. 42, 1696-1699 (2017)
- "Enhanced nonlinear imaging through scattering media using transmission-matrix-based wave-front shaping".
de Aguiar, Gigan, Brasselet, Phys. Rev. A 94, 043830 (2016)
- "Detection of buried microstructures by nonlinear light scattering spectroscopy". De Beer, De Aguiar, Nijsen, Roke, Phys. Rev. Lett. 102, 095502 (2009)

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 Stephen H. Donaldson (2015-2019)

Stephen received his PhD in chemical engineering from UC Santa Barbara in 2014 under the direction of Prof. Jacob Israelachvili and Prof. Bradley Chmelka. His PhD research focused on measuring physical surface interactions in aqueous colloidal, polymeric, and lipid membrane systems. During his PhD, he helped develop an interaction potential to describe hydrophobic interactions in self-assembling systems, including lipid and surfactant membranes, nanoparticle assemblies, and functionalized interfaces. He also examined controlled adhesives by applying stimulus (light, electrochemistry, pH) or altering surface functionality (hydrophobic, hydrophilic, charged).
His personal research interests have recently transitioned towards biophysics, including biological adhesion, membrane fusion, protein-membrane interactions, and ligand-receptor interactions. As a JRC at ENS, he collaborates with groups in the Laboratory of Statistical Physics to elucidate membrane adhesion and fusion mechanisms in a diverse set of biological systems, with applications such as neurotransmitter release, G-protein coupled receptor signaling, Alzheimer’s disease progression, and fusion proteins.

Selected publications
- “Real time intermembrane force measurements and imaging of lipid domain morphology during hemifusion” D. W. Lee, K. Kristiansen, S. H. Donaldson Jr, N. Cadirov, X. Banquy, J. N. Israelachvili, accepted to Nature Communications, April 2015.
- “Developing a general interaction potential for hydrophobic and hydrophilic interactions” S. H. Donaldson Jr, A. Røyne, K. Kristiansen, M. V. Rapp, S. Das, M. A. Gebbie, D. W. Lee, P. Stock, M. Valtiner, J. N. Israelachvili, Langmuir (2015), 31, 2051-2064.
- “Asymmetric electrostatic and hydrophobic-hydrophilic interaction forces between mica surfaces and silicone polymer thin films” S. H. Donaldson Jr, S. Das, M. A. Gebbie, M. V. Rapp, L. C. Jones, Y. Roiter, P. H. Koenig, Y. Gizaw, J. N. Israelachvili, ACS Nano (2013), 7 (11), 10094-10104.
- “Interactions and visualization of bio-mimetic membrane detachment at smooth and nano-rough gold electrode surfaces” S. H. Donaldson Jr, M. Valtiner, M. A. Gebbie, J. Harada, J. N. Israelachvili, Soft Matter (2013), 9 (21), 5231-5238.
- “Hydrophobic interactions modulate self-assembly of nanoparticles” A. Sanchez-Iglesias, M. Grzelczak, T. Altantzis, B. Goris, J. Perez-Juste, S. Bals, G. Van Tendeloo, S. H. Donaldson Jr, B. F. Chmelka, J. N. Israelachvili, L. M. Liz-Marzan, ACS Nano (2012), 6 (12), 11059-11065.
- “General hydrophobic interaction potential for surfactant/lipid bilayers from direct force measurments between light-modulated bilayers” S. H. Donaldson Jr, C. T. Lee, B. F. Chmelka, J. N. Israelachvili, PNAS (2011), 108 (38), 15699-15704.

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 Andrei Lazanu (2018-2020)

After completing the Mathematical Tripos at the University of Cambridge, Gonville and Caius College (BA & MMath), I have pursued a PhD in theoretical physics at DAMTP, University of Cambridge (2012-2016) under the supervision of Prof. Paul Shellard, studying the effects of topological defects on the Cosmic Microwave Background and the inflationary bispectrum of the large-scale structure of the Universe. Afterwards, I have been an InDark postdoctoral fellow at INFN, Padua, Italy, focussing on the analytical modelling of the matter bispectrum of large scale structure and on obtaining forecasts for primordial non-Gaussianity.

At ENS, I will develop analytical and numerical techniques to model the galaxy bispectrum in order to place stringent constraints on cosmological parameters. These will involve both work to model the matter bispectrum towards the nonlinear regime, as well as accurate large-scale studies for the galaxy bispectrum. Part of the work is now being pursued in the framework of the Euclid Consortium. I will also study models of dark energy and modified gravity and in particular I will focus on employing three-point correlation functions to constrain parameters of these models.

Selected publications
- The two and three-loop matter bispectrum in perturbation theories, A. Lazanu, M. Liguori, JCAP 1804 (2018) no.04, 055
- Constraining primordial non-Gaussianity with bispectrum and power spectrum from upcoming optical and radio surveys, D. Karagiannis, A. Lazanu, M. Liguori, A. Raccanelli, N. Bartolo, L. Verde, Mon.Not.Roy.Astron.Soc. 478 (2018) no.1, 1341-1376
- Matter bispectrum of large-scale structure : Three-dimensional comparison between theoretical models and numerical simulations, A. Lazanu, T. Giannantonio, M. Schmittfull, E.P.S. Shellard, Phys.Rev. D93 (2016) no.8, 083517
- Contribution of domain wall networks to the CMB power spectrum, A. Lazanu, C.J.A.P. Martins, E.P.S. Shellard, Phys.Lett. B747 (2015) 426-432
- CMB power spectrum of Nambu-Goto cosmic strings, A. Lazanu, E.P.S. Shellard, M. Landriau, Phys.Rev. D91 (2015) no.8, 083519

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 Fedor Levkovich-Maslyuk (2017-2020)

Fedor graduated from Moscow State University, and obtained his PhD from King’s College London in 2016. He moved on to a postdoc at the Nordita Institute in Stockholm before coming to ENS in 2017. His research focuses on understanding the dynamics of strongly interacting quantum field theories. In particular, he is exploring integrable gauge theories where one can obtain exact results unreachable by standard methods. This also sheds new light on the relation between gauge and string theories, at the same time revealing deep underlying mathematical structures. Fedor’s work has contributed to the understanding of the exact spectrum in several 3d and 4d models, such as N=4 super Yang-Mills theory which in some limits gives new predictions for realistic models of strong nuclear forces. His current research centers on new ways of computing correlation functions in these models as well as in quantum spin chains.

Selected publications
- A. Cavaglia, N. Gromov, F. Levkovich-Maslyuk, "Quantum spectral curve and structure constants in N=4 SYM : cusps in the ladder limit", JHEP 1810 (2018) 060 [arXiv:1802.04237]
- M. Guica, F. Levkovich-Maslyuk, K. Zarembo, "Integrability in dipole-deformed N=4 super Yang–Mills", J.Phys. A50 (2017) no.39, 394001 [arXiv:1706.07957]
- N. Gromov, F. Levkovich-Maslyuk, G. Sizov, "New Construction of Eigenstates and Separation of Variables for SU(N) Quantum Spin Chains", JHEP 1709 (2017) 111 [arXiv:1610.08032]
- N. Gromov, F. Levkovich-Maslyuk, "Quark-anti-quark potential in N=4 SYM", JHEP 1612 (2016) 122 [arXiv:1601.05679]
- N. Gromov, F. Levkovich-Maslyuk, G. Sizov, "Pomeron Eigenvalue at Three Loops in N=4 Supersymmetric Yang-Mills Theory", Phys.Rev.Lett. 115 (2015) no.25, 251601 [arXiv:1507.04010]

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 Stéphane Perrard (2018-2020)

Stéphane is an experimental physicist in non linear Physics and fluid dynamics. After his undergraduate and master studies at Ecole Normale Supérieure of Paris & Lyon, he did his PhD with Y. Couder and E. Fort at university Paris-Diderot. During his PhD he studied experimentally the dynamics of a pilot-wave system formed by a drop bouncing on a liquid surface and the waves it generates. In 2015, he joined the James Franck Institute at the University of Chicago as a postdoctoral scholar with Pr. W. Irvine. For two years, he had designed experiments to study hydrodynamics turbulence in inhomogeneous and un-stationnary situations. In summer 2017, he started a long term collaboration with Pr L. Deike at Princeton University on turbulent two phase flows and their application to ocean-atmosphere exchanges. In 2017-2018, he got a joined appointment between University Paris-Sud and Ecole Polytechnique where he studied theoretically the generation of waves by the wind.

Since September 2018, he is a junior research chair at Ecole Normale Supérieure. His current work focuses on fundamental aspects of large scale in turbulent flows, interface-turbulence interactions and pilot-wave systems.

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 Julian Struck (2017-2020)

Julian Struck received his PhD in 2013 under the supervision of Prof. Dr. Klaus Sengstock (University of Hamburg), working on bosonic quantum gases in artificial gauge fields and driven optical lattices. In 2014 he joined the group of Prof. Dr. Martin Zwierlein at the Massachusetts Institute of Technology (MIT). His postgraduate research in the field of strongly interacting, ultracold Fermi gases focused on Fermi Liquid behavior, hydrodynamics, phonon decay and short-range correlations.

Currently he is studying strongly interacting Fermi gases in 1D and in the 3D to 1D crossover.

Selected publications
- Z. Yan, P. B. Patel, B. Mukherjee, R. J. Fletcher, J. Struck and M. W. Zwierlein.
Boiling a Unitary Fermi Liquid.
arXiv:1811.00481 (2018).
- B. Mukherjee, Z. Yan, P. B. Patel, Z. Hadzibabic, T. Yefsah, J. Struck and M. W. Zwierlein. Homogeneous Atomic Fermi Gases.
Physical Review Letters 118:123401 (2017).
- J. Struck, M. Weinberg, C. Ölschläger, P. Windpassinger, J. Simonet, K. Sengstock, R. Höppner, P. Hauke, A. Eckardt, M. Lewenstein and L. Mathey.
Engineering Ising-XY spin-models in a triangular lattice using tunable artificial gauge fields. Nature Physics 9:738–743 (2013).
- J. Struck, C. Ölschläger, M. Weinberg, P. Hauke, J. Simonet, A. Eckardt, M. Lewenstein, K. Sengstock and P. Windpassinger.
Tunable Gauge Potential for Neutral and Spinless Particles in Driven Optical Lattices.
Physical Review Letters 108:225304 (2012).
- J. Struck, C. Olschlager, R. Le Targat, P. Soltan-Panahi, A. Eckardt, M. Lewenstein, P. Windpassinger and K. Sengstock.
Quantum Simulation of Frustrated Classical Magnetism in Triangular Optical Lattices.
Science 333:996–999 (2011).

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 Manuel Gessner (2018-2020)

Manuel is a theorist working in the fields of quantum information and quantum metrology with applications especially with cold atoms, trapped ions and photonic systems.
He obtained his Diploma (2011) and PhD (2015) from the University of Freiburg, Germany. There he worked on correlations in open quantum systems and developed methods for the characterization of many-body quantum systems in the groups of H.-B. Breuer and A. Buchleitner. From 2012-2013 he visited the University of California, Berkeley as part of his PhD studies, where he worked in the experimental group of H. Häffner on trapped ions. From 2015-2018, Manuel joined A. Smerzi’s theory group at LENS in Florence, Italy as a postdoc, working mostly on interferometry, quantum correlations and Bose-Einstein condensates.
At the Ens, Manuel’s research focuses on quantum metrology and quantum correlations with multi-mode systems, in particular the characterization of multipartite entanglement and the generation of highly sensitive states for precision measurements. He collaborates closely with experiments at LKB on cold atoms and quantum optics.

Selected publications
- M. Gessner, L. Pezzè and A. Smerzi
Sensitivity bounds for multiparameter quantum metrology
Physical Review Letters 121, 130503 (2018).
- M. Gessner, L. Pezzè, and A. Smerzi
Efficient entanglement criteria for discrete, continuous, and hybrid variables
Physical Review A 94, 020101(R) (2016).
- E. G. Carnio, A. Buchleitner, and M. Gessner
Robust asymptotic entanglement under multipartite collective dephasing
Physical Review Letters 115, 010404 (2015).
- M. Gessner, M. Ramm, T. Pruttivarasin, A. Buchleitner, H.-P. Breuer, and H. Häffner
Local Detection of Quantum Correlations with a Single Trapped Ion
Nature Physics 10, 105 (2014).
- M. Gessner and H.-P. Breuer
Detecting Nonclassical System-Environment Correlations by Local Operations
Physical Review Letters 107, 180402 (2011).

Pour nous contacter

Jean-Marc Berroir
Directeur du Labex
directeur@phys.ens.fr

Junior Research Chairs

Chaque année, le Labex recrute troix nouveaux JRC.
Pour en savoir plus sur la procédure de recrutement et le calendrier, cliquez ici.

Master de Physique Fondamentale

L’appel à candidatures pour la session 2018/2019 est clôturé :

Pour toute question administrative concernant le master ICFP, vous pouvez nous contacter à l’adresse suivante :
applicationicfp@phys.ens.fr