LPTMS PhD Proposal: Non stationary avalanches in disordered systems
Responsable: Alberto ROSSO 01 69 15 31 79
In many macroscopic systems the response to a constant energy input can be strongly nonlinear: stress slowly accumulates over time up to a sudden and unpredictable energy release is induced by an extended reorganisations called avalanches. Economical crisis, earthquakes or epidemic outbreaks are examples of avalanche dynamics. Also the intermittent flow of soft materials, like mayonnaise or foams, can be understood in terms of avalanches. For almost 20 years, there have been many attempts to understand avalanches in the framework of critical and collective phenomena. An important result has been to show that avalanches display universal statistics. However we now know that the physics behind these latter phenomena is much richer than their equilibrium counterpart. In particular avalanches have a strong memory of the story of the material. As remarquable examples one can cite the aftershocks after an earthquake or the occurrence of a macroscopic failure in well aged materials. In this thesis we will focus on avalanches produced using nonstationary protocols in connection with experimental observations and using the tools developed for disordered systems.
LPTMS PhD Proposal: Phase transition in Mean Field Games
Responsable: Denis ULLMO 01 69 15 74 76
Mean field games present a new area of research at the boundary between applied mathematics, social sciences, engineering sciences and physics. It has been initiated a decade ago by PierreLouis Lions (recipient of the 94 Fields medal) and JeanMichel Lasry as a new and promising tool to study many problem of social sciences, and with an explicit mention of the influence of concepts coming from physics (the notion of “mean field approximation”). This field has since then grown significantly, and after a period where mainly stylized models where introduced, we witness now the appearance of (necessarily more involved) mean field game models closer to practical applications in finance, vaccination policies, or energy management through smart electronics. Up to now, the development of Mean Field Games has mainly originated from the mathematics and economic communities. Mean Field Games theory is, however, by essence a multidisciplinary field for which the input of physicists is much needed. Indeed, as important as they are, the studies of internal consistency and the numerical schemes developed by mathematicians cannot replace the deeper understanding of the behavior of these models, obtained in particular through powerful approximation schemes, that physicists (and essentially only them) know how to provide.
In this general context, the goal of this internship will be to study "phase transitions" in MFG, that is a discontinuous changes of behavior as a parameter is varied. During the internship, this study will be limited to a class of Mean Field Games for which there exist a formal, but deep, connection with the nonlinear Schrödinger equation, which is making their analysis, and in particular the origin of these phase transitions, more transparent.
LPTMS Postdoc: Postdoctoral position in lowdimensional quantum systems (theory), 2 years funded
The position is funded as a part of an AustrianFrench research collaboration aimed at exploring, in a joint experimental and theoretical effort, the dynamics of impurities inside quantum wires of ultracold atoms. Dr. Mikhail Zvonarev and Prof. H.C. Naegerl coordinate the project on the French and Austrian sides, respectively. The successful applicant will work at the Laboratory of Theoretical Physics and Statistical Models (LPTMS), Orsay, France. A solid background of the applicant in theoretical quantum condensed matter physics is necessary, an experience in the analytical/numerical approaches to low dimensional systems is desirable.
Application should be prepared as a single PDF file containing

Letter of motivation (max. half a page)

CV + List of publications

Contact details of at least two possible referees
It should be sent by email to mikhail.zvonarev@gmail.com,
subject line Postdoc_Your Family Name
There is no deadline for the application, the search will continue until the position is filled.
LPTMS PhD Proposal: Emergence of fibers in frustrated selfassembly
Responsable: Martin Lenz 01 69 15 32 62
Selforganization is key to the function of living cells – but sometimes goes wrong! In Alzheimer’s
and many other diseases, normally soluble proteins thus clump up into pathological fiberlike
aggregates. While biologists typically explain this on the grounds of detailed molecular interactions, we
have started proving that such fibers are actually expected from very general physical principles. We
thus show that geometrical frustration builds up when mismatched objects selfassemble, and
leads to nontrivial aggregate morphologies, including fibers.
Despite several examples of this in our numerical simulations (see illustration), we have yet to
better understand the underlying physics. Is fiber formation based on a welldefined phase transition? Is
this transition fundamentally out of equilibrium as some of our results suggest? To what extent can it be
mapped onto the standard geometrical understanding of frustration as the embedding of a manifold into
a space with an incompatible metric? We will tackle these questions using two minimal models of
frustration where we hope to combine analytical and numerical insights. One of these is akin to
historical descriptions of Josephson junctions, where latticebased Heisenberg spins want to realize a
certain fixed mismatch in their alignments between neighboring sites.
This project offers opportunities for collaborations with the theoretical group of Gregory Grason at
U. Mass. Amherst (USA), as well as with several groups that are currently initiating experiments on
frustrationdriven fiber formation.
Informal inquiries welcome.
LPTMS Poste: Maître de Conférences 2018 / Assistant professor position
English version of this context below the French one
Physique et modélisation statistique : aspects classiques et quantiques
Un poste de maître de conférences devrait être proposé au concours au printemps 2018.
Enseignement
Le ou la candidate devra être à même d'enseigner à tous les niveaux de la formation universitaire. Elle ou il pourra dispenser un enseignement général en licence (en physique ou dans les disciplines connexes comme les mathématiques, l'informatique, voire la biologie ou la chimie). Plus spécifiquement, des besoins urgents se profilent avec l'arrivée de l'Ens ParisSaclay, ainsi qu'avec la montée en puissance des double diplômes comme la Licence Mathématiques Physique. Enfin, la future recrue sera amenée à s'investir au sein du Master des Systèmes Complexes, qui est actuellement en restructuration profonde. Une expérience d'enseignement, acquise en thèse ou pendant des années postdoctorales, est souhaitable.
Recherche
Le LPTMS souhaite développer son activité dans les applications de la physique statistique, en matière condensée au sens large, mais également en direction d'un certain nombre d'interfaces qui sont explorées actuellement (mathématiques, chimie, théorie de l'information, biologie,…). Le profil recherché est celui d'une candidature avec une excellente formation en physique théorique, capable d'interagir avec une ou plusieurs des équipes du LPTMS. Une bonne connaissance de la physique numérique sera un atout.
Contexte
Ce recrutement s'insère au sein du Centre de Physique Matière et Rayonnement (CPMR) de la future Université ParisSaclay (regroupement de 5 laboratoires LPSLACFASTISMOLPTMS), et un intérêt pour les applications de la théorie aux problèmes expérimentaux sera apprécié. Le déménagement du LPTMS en novembre 2018, au coeur même du CPMR, est de ce point de vue un atout important.
Attention, les candidats doivent être qualifiés par le CNU pour pouvoir candidater. La date limite pour initier les démarches de qualification est le 24 octobre 2017, consulter
https://www.galaxie.enseignementsuprecherche.gouv.fr/ensup/cand_qualification_droit_commun.htm

Statistical Physics and Modelling : classical and quantum aspects
An assistant professor position will presumably be open in 2018, with competition taking place during the spring.
Teaching
The candidate will teach at all University levels. He/She will take part in the undergraduate physics program, and possibly in other programs such as mathematics, informatics, or biology and chemistry. More specifically, the settlement of Ens ParisSaclay on campus and the rise of mixed mathematicsphysics curricula go with enhanced needs of physics teaching. In addition, the selected person will have the opportunity to get involved into the newly reorganized Physics of Complex Systems Masters. A significant experience in teaching during doctoral and/or postdoctoral studies will be appreciated.
Research activities
LPTMS aims at developing its activities, from applications of statistical physics in condensed matter physics in a broad sense, to new directions that are currently being investigated at the interface with mathematics, chemistry, information theory or biology. The candidate is expected to have a strong background in theoretical physics, and to be able to interact with one or several teams at LPTMS. A good knowledge of computational physics will be an advantage. The position will integrate the future Centre de Physique Matière et Rayonnement (CPMR) of the ParisSaclay University, a joint program of 5 laboratories LPSLACFASTISMOLPTMS. The relocation of LPTMS within the premises of CPMR in November 2018 is an important perspective and an interest in experimental questions will thus be appreciated.
Candidates are expected to have a good command of French language. Besides, they should be beforehand qualified by the CNU. The deadline to initiate the qualification procedure is Oct 24 2017, see
https://www.galaxie.enseignementsuprecherche.gouv.fr/ensup/cand_qualification_droit_commun.htm