Former fellows

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Jean-Marc Berroir
Labex Director
directeur@phys.ens.fr

Sarah Reemers
Administrative manager of Labex
sarah.reemers@phys.ens.fr

Master in Fundamental Physics

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https://applicationicfp.phys.ens.fr

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In alphabetical order.

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Badih Assaf (2014-2018) / Currently Assistant Professor, University of Notre Dame (Indiana, US)
Badih’s research interests are primarily focused on studying and understanding the electronic properties of 2D materials and topological insulators. The most common 2D material is graphene which is essentially a single atomic sheet of carbon. Topological insulators, on the other hand, are 3D materials that are semiconducting in the bulk but highly conducting on the surface. Such materials are extremely attractive as potential silicon alternatives in data processing devices as well as for applications in memory devices and optoelectronics.

After completed his Bachelor degree in physics at the American University of Beirut in 2009, he spent five years as a graduate student at Northeastern University. As a member of the Heiman group at Northeastern, and a visiting scientist at MIT with the Moodera group, he spent the bulk of my PhD work studying quantum coherent transport in topological insulator thin films grown by molecular beam epitaxy. He also took part in a project that involved studying the properties of novel spin-gapless Heusler alloys.

As a JRC at the Ecole Normale Supérieure, he was directly involved with groups from the Laboratoire Pierre Aigrain that are working on probing the fundamental electronic properties of 2D materials as well as different topological material systems (Bi2Se3, Bi2Te3…) using gigahertz transport probes and terahertz spectroscopy.

Selected Publications
- G. Krizman, B.A. Assaf, M. Orlita, T. Phuphachong, G. Bauer, G. Springholz, G. Bastard, R. Ferreira, L.A. de Vaulchier, Y. Guldner. “Avoided level crossing at the magnetic field induced topological phase transition due to orbital mixing” submitted arxiv1808.03361
- G. Krizman, B.A. Assaf, T. Phuphachong, G. Bauer, G. Springholz, G. Bastard, R. Ferreira, L.A. de Vaulchier, Y. Guldner. “Tunable Dirac interface states in topological superlattices” Phys. Rev. B 98 075303 (2018). Arxiv1806.04676.
- D. Walkup, B.A. Assaf, K.L. Scipioni, R. Sankar, F. Chou, G. Chang, H. Lin, I. Zeljkovic, V. Madhavan, “Interplay of orbital effects and nanoscale strain in topological crystalline insulator.” Nature Communications 9 1550 (2018). arxiv1610.09337.

https://www.linkedin.com/in/badih-a-assaf-3b57bb77/

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Tatsuo Azeyanagi (2013-2016) / Currently Data scientist at D2C, a digital marketing and advertising company (Japan)

Tatsuo received his Ph.D. in Science from Kyoto University (2011) and continued his research at RIKEN working on string theory and quantum field theories. After his post-doc at ENS, he was a post-doc at Univeristy of Brussels (ULB) for 3 years.

His main research interests were :
- microscopic analysis of black holes based on string theory and gauge/gravity dualities
- large-N gauge theories, matrix models and their relations to string/M theory.
He now carries out research on machine learning algorithms, applying them for digital marketing and online advertisement.

Selected publications
- "The Spectrum of Strings on Warped AdS3xS3," Tatsuo Azeyanagi, Diego M. Hofman, Wei Song and Andrew Strominger, arXiv:1207.5050[hep-th]
- "Large-N reduction in QCD-like theories with massive adjoint fermions," Tatsuo Azeyanagi, Masanori Hanada, Mithat Unsal and Ran Yacoby, Phys.Rev.D82(2010)125013
- "Higher-Derivative Corrections to the Asymptotic Virasoro Symmetry of 4d Extremal Black Holes," Tatsuo Azeyanagi, Geoffrey Compere, Noriaki Ogawa, Yuji Tachikawa and Seiji Terashima, Prog.Theor.Phys.122(2009)355-384

https://www.linkedin.com/in/tatsuo-azeyanagi/

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Hilton Barbosa de Aguiar (2016-2020) / Currently permanent PI at the Laboratoire Kastler-Brossel (Paris, France)
Hilton is an experimentalist working on the development and applications of nonlinear microscopy and spectroscopy tools for probing complex soft matter systems. His PhD (EPFL/Lausanne, jointly with Max-Planck Institute/Stuttgart) focused on using interface-specific nonlinear spectroscopy tools for unraveling molecular level details of colloidal particle interfaces. His post-doc activities (Stuttgart University, Stuttgart ; Fresnel Institut, Marseille) focused on nonlinear imaging of biological systems, with particular emphasis in challenging scattering systems. As a JRC, he started novel research lines on the merging of signal processing and microscopy, so-called computational microscopy, for biomedical imaging applications. He is now a CNRS researcher at the Laboratoire Kastler-Brossel in the group Complex Media Optics Lab. All in all, the advanced tools are based on label-free approaches exploiting the intrinsic vibrational response of molecular systems.

Selected publications
- Water structure, dynamics and sum-frequency generation spectra at electrified graphene interfaces. Y. Zhang, H. B. de Aguiar, J. T. Hynes, D. Laage (2020)
- Focussing large spectral bandwidths through scattering media. A. G. Vesga, M. Hofer, N. K. Balla, H. B. de Aguiar, M. Guillon, S. Brasselet (2019)
- Interface-Sensitive Raman Microspectroscopy of Water via Confinement with a Multimodal Miniature Surface Forces Apparatus. H. B. de Aguiar, J. D. McGraw, S. H. Donaldson Jr. (2019)
- Fast compressive Raman bio-imaging via matrix completion. Soldevila, Dong, Tajahuerce, Gigan, de Aguiar. Optica 3, 341-346 (2019)

http://www.lkb.upmc.fr/opticalimaging/
https://hiltonbarbosa.wixsite.com/deaguiar

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Jacopo De Nardis (2016-2018) / Currently Post-doctoral fellow, Ghent University (Belgium)
Jacopo received his master in theoretical physics at the University of Pisa (2011) before moving to the University of Amsterdam (UvA) for his PhD, studying the realm of one-dimensional interacting integrable models.
Further research interests are out-of-equilibrium dynamics and equilibrium dynamical correlations of integrable systems in the thermodynamic limit, together with the study of non-equilibrium strongly interacting classical statistical models which are mappable to quantum integrable models (Kardar-Parisi-Zhang equation, Simple Exclusion Processes)

Selected Publications
- M. Panfil, J. De Nardis, J-S Caux, Metastable criticality and the super Tonks-Girardeau gas, Phys. Rev. Lett. 110, 125302 (2013)
- J. De Nardis, B. Wouters, M. Brockmann, J-S Caux, Solution for an interaction quench in the Lieb-Liniger Bose gas, Phys. Rev. A 89, 033601 (2014)
- B. Wouters, J. De Nardis, M. Brockmann, D. Fioretto, M. Rigol, J-S Caux, Quenching the Anisotropic Heisenberg Chain : Exact Solution and Generalized Gibbs Ensemble Predictions, Phys. Rev. Lett. 113, 117202 (2014)

https://www.linkedin.com/in/jacopo-de-nardis-4b811435/

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Stephen H. Donaldson (2015-2019)/ Currently in R&D with company Gore Tex
Stephen received his PhD in chemical engineering from UC Santa Barbara (2014), focusing on measuring physical surface interactions in aqueous colloidal, polymeric, and lipid membrane systems.

His personal research interests have transitioned towards biophysics, including biological adhesion, membrane fusion, protein-membrane interactions, and ligand-receptor interactions. As a JRC at ENS, he worked at elucidating 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.

https://www.linkedin.com/in/stephen-donaldson-a557b399/

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Maurizio Fagotti (2015-2017) / Currently permanent PI CNRS, Université Paris-Sud (France)
Maurizio did his PhD at the University of Pisa (Italy) focusing on the scaling behaviour of the entanglement entropies and the non-equilibrium time evolution of a state after a sudden quench of a global Hamiltonian parameter. As a post-doctoral research assistant in Oxford (UK) he collaborated with Prof. Fabian Essler on the latter topic. His research interests : quantum quenches, integrable models, relaxation/thermalisation, entanglement.

Selected Publications
- M. Fagotti, “On Conservation Laws, Relaxation and Pre-relaxation after a Quantum Quench”, arXiv:1401.1064 (2014)
- M. Fagotti and F.H.L. Essler, “Stationary behaviour of observables after a quantum quench in the spin-1/2 Heisenberg XXZ chain”, J. Stat. Mech. (2013) P07012
- M. Fagotti and F.H.L. Essler, “Reduced Density Matrix after a Quantum Quench”, Phys. Rev. B 87, 245107 (2013)

https://www.linkedin.com/in/maurizio-fagotti-b9399141/

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Anastasia Fialkov (2013-2015) / Currently ITC Fellow, Harvard (US)
Anastasia’s research interests are very broad within theoretical cosmology and astrophysics : 21-cm cosmology, large-scale structure, Cosmic Microwave Background radiation, gravitational lensing, inflation and other related fields.

She did her PhD at Tel Aviv University on two subjects : cosmological signature of pre-inflationary relics, and first stars and their imprints in the 21-cm signal.

Selected publications
- "The 21-cm signature of the first stars during the Lyman-Werner feedback era", Fialkov A., Barkana R., Visbal E., Tseliakhovich D., Hirata C. M., MNRAS, submitted
- "The signature of the first stars in atomic hydrogen at redshift 20’’, Visbal E., Barkana R., Fialkov A., Tseliakhovich D., Hirata C. M., 2012 Nature
- "Impact of the relative motion between dark matter and baryons on the first stars : semi-analytical modelling" Fialkov A., Barkana R., Tseliakhovich D., Hirata C. M., 2012, MNRAS, 242

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Emmanuel Flurin (2017-2018) / Currently Permanent researcher at Quantronics - CEA, Saclay (France)
Emmanuel obtained his PhD at ENS physics department, on microwave amplification at the quantum limit. His first post-doctoral position at Berkeley (US) focused on a similar topic, in the prestigious group of Prof. Irfan Siddiqi.

As a JRC at ENS he worked at exploiting original quantum resources at microwave frequencies to enhance the position metrology of a mechanical oscillator.

Selected publications
- Observing topological invariant using quantum walk in superconducting circuits. E Flurin, VV Ramasesh, S Hacohen-Gourgy, N Yao, I Siddiqi ; arXiv preprint 1610.03069 (submitted)
- Direct Probe of Topological Invariants Using Bloch Oscillating Quantum Walks. VV Ramasesh, E Flurin, M. Rudner, I Siddiqi, N Yao ; arXiv preprint 1609.09504 (submitted)
- Simultaneous measurement of non-commuting observables in circuit QED. S Hacohen-Gourgy, L Martin, E Flurin, VV Ramasesh, B Whaley, I Siddiqi ; Nature 538, 491 (2016)

https://www.linkedin.com/in/emmanuel-flurin-08367019b/https://www.linkedin.com/in/emmanuel-flurin-08367019b/

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Michael Köpf (2013-2015) / Currently AI & Cloud consultant for company Consilica (Köln, Germany)
As a mathematically inclined student of physics at the University of Münster (Germany), Michael was attracted to the science of nonlinear dynamics and self-organization. His PhD focused on theoretical model of spontaneous formation of nanoscopic stripe patterns in coating processes using mono-molecular layers. This research project allowed to bridge fundamental science and technological application.

Michael’s interest shifted towards the ultimate form of self-organization : Life. With a postdoctoral scholarship from the Human Frontier Science Program, he moved to the Technion in Haifa (Israel) to work on the mathematical description of biological and bio-mimetic materials in various contexts.

In his ENS project "Growth and Development in Biological Systems : From Bacteria to Olive Trees" he worked on growth and development on the various different scales of life.

More information :
http://www.michaelkoepf.de/
https://www.linkedin.com/in/michael-k%C3%B6pf-consilica/

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Fedor Levkovich-Maslyuk (2017-2020)/ Currently Post-doctoral fellow at IPT, Saclay University (France)
Fedor graduated from Moscow State University, and obtained his PhD from King’s College London (UK). He held a fist post-doctoral position at the Nordita Institute (Stockholm) before joining ENS.

His research focuses on understanding the dynamics of strongly interacting quantum field theories. Fedor’s work contributed to the understanding of the exact spectrum in several 3d and 4d models, giving new predictions for realistic models of strong nuclear forces.

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]

More information : https://scholar.google.com/citations?user=-vFwZfMAAAAJ&hl=en
https://orcid.org/0000-0003-4159-9358

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Leonardo Mazza (2015-2018) / Currently Maître de conférences, Université Paris-Sud (France)
He obtained his PhD at the Max-Planck-Institut of Quantum Optics (2012), on ultra-cold atoms and quantum simulations, with a strong focus on topological phases of matter. He held his first post-doctoral position in Pisa (group of R. Fazio).

His research topics : interactions in cold atomic gases coupled to synthetic gauge potentials, possible identification of topological phases of matter in such setups, Majorana fermions in low-dimensional superconductors. Employing numerical techniques especially suited for one-dimensional systems, he has studied several aspects of their non-equilibrium physics, from energy transport to dissipation.

Selected publications
- Localized Majorana-like modes in a number conserving setting : An exactly solvable model. Iemini, Mazza, Rossini, Diehl and Fazio, arXiv:1504.04230 (2015).
- Magnetic crystals and helical liquids in alkaline-earth fermionic gases. Barbarino, Taddia, Rossini, Mazza and Fazio, arXiv:1504.00164 (2015).
- Robustness of quantum memories based on Majorana zero modes. Mazza, Rizzi, Lukin and Cirac, PRB 88, 205142 (2013).

More information : https://sites.google.com/site/leonardmaz/

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Joshua McGraw (2015-2017) / Currently permanent PI CNRS, ESPCI (France)
As an experimental soft condensed matter physicist, Josh obtained his PhD in confined polymer physics, organic glasses, and thin film flows at McMaster University (Canada) in 2012. His held his first post-doctoral position at Saarland University (Germany), focusing on the slip hydrodynamic boundary condition. As a JRC Josh accentuated his research at the nanoscale, along with a move towards elastohydrodynamics — a rising field crucial to soft and bio systems.

Selected publications
- S. Haefner, M. Benzaquen, O. Bäumchen, T. Salez, R. Peters, J.D. McGraw, K. Jacobs, E. Raphaël, K. Dalnoki-Veress, Influence of Slip on the Plateau-Rayleigh Instability on a Fibre, Nature Communications (in press) ; arXiv:1501.02194.
- J.D. McGraw, O. Bäumchen, M. Klos, S. Haefner, M. Lessel, S. Backes and K. Jacobs, Nanofluidics of thin polymer films : Linking the slip boundary condition at solid-liquid interfaces to macroscopic pattern formation and microscopic interfacial properties, Advances in Colloid and Interface Science, 210 (2014) 13.
- Y. Chai, T. Salez, J.D. McGraw, M. Benzaquen, K. Dalnoki-Veress, E. Raphaël, J. Forrest, A Direct Quantitative Measure of Surface Mobility in a Glassy Polymer, Science, 343 (2014) 994.

https://www.linkedin.com/in/joshua-mcgraw-8708b317b/

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Olga Petrova (2016-Aug 2018) / Currently Machine Learning Engineer with company Scaleway (France)
As a theoretical condensed matter physicist Olga focused on various aspects of quantum magnetism. After a PhD at Johns Hopkins University (USA) she moved on to her first post-doctoral positionat the Max Planck Institute for the Physics of Complex Systems (Germany). As a JRC at ENS she collaborated on the studies of quantum spin liquids with N. Regnault.

Selected pulications
- "Coulomb potential V (r)= 1/r problem on the Bethe lattice", O Petrova, R Moessner, Physical Review E 93 (1), 012115 (2016)
- "Hydrogenic states of monopoles in diluted quantum spin ice", O Petrova, R Moessner, SL Sondhi, Physical Review B 92 (10), 100401 (2015)
- "Projective symmetry of partons in the Kitaev honeycomb model", P Mellado, O Petrova, O Tchernyshyov, Physical Review B 91 (4), 041103 (2015)

https://www.linkedin.com/in/olga-p-petrova/

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Valentina Ros (2019-2020)/ currently permanent PI at LPTMS (Orsay, France)
With a PhD in Statistical Physics obtained at the International School for Advanced Studies (SISSA) in Trieste (Italy), Valentina joined first the Institute of Theoretical Physics of CEA in Saclay as a postdoctoral researcher, before becoming a JRC in 2019.

She is interested in quantum and classical disordered systems, ergodicity breaking and out-of-equilibrium dynamics. Her research activity focuses on quantum localization phenomena, high-dimensional random landscapes and glassy systems.

Statistical and Nonlinear Physics Early Career Prize of the European Physical Society (2019).

Selected Publications
- Distribution of rare saddles in the p-spin energy landscape, Journal of Physics A : Mathematical and Theoretical 53, 125002 (2020).
- Complex energy landscapes in spiked-tensor and simple glassy models : ruggedness, arrangements of local minima and phase transitions, with G. Ben Arous, G. Biroli and C. Cammarota, Physical Review X 9, 011003 (2019).
- Remanent magnetization : signature of Many-Body Localization, with M. Mueller, Physical Review Letters 118, 237202 (2017).

https://www.linkedin.com/in/valentina-ros-6199951b7/

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Julian Struck (2017-2021)
Julian received his PhD in 2013 under the supervision of Prof. Dr. K. 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.

At LKB / ENS, Julian conceived, planned and supervised pioneering experiments on individually resolved ultracold atomic Fermi gases in the 1D regime and 1D-3D crossover. His studies covered a broad variety of topics ranging from thermodynamics to out-of-equilibrium phenomena and transport with strong interactions.

Selected publications
- C. De Daniloff, M. Tharrault, C. Enesa, C. Salomon, F. Chevy, T. Reimann and J. Struck. In Situ Thermometry of Fermionic Cold-Atom Quantum Wires. arXiv:2102.01589 (Physical Review Letters in press)
- P. B. Patel, Z. Yan, B. Mukherjee, R. J. Fletcher, J. Struck and M. W. Zwierlein. Universal sound diffusion in a strongly interacting Fermi gas. Science 370:1222-1226 (2020)
https://science.sciencemag.org/content/370/6521/1222/tab-article-info
- Z. Yan, P. B. Patel, B. Mukherjee, R. J. Fletcher, J. Struck and M. W. Zwierlein. Boiling a Unitary Fermi Liquid. Physical Review Letters 122:093401 (2019)
- 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).

More information : http://www.lkb.upmc.fr/ultracoldfermigases/julian-struck/
https://www.linkedin.com/in/julianstruck/

Contact us


Jean-Marc Berroir
Labex Director
directeur@phys.ens.fr

Sarah Reemers
Administrative manager of Labex
sarah.reemers@phys.ens.fr

Master in Fundamental Physics

Application
https://applicationicfp.phys.ens.fr

Contact
click here

Scholarship
More information