Opening for a Master M2 Internship at IPhT, CEA-Saclay

I have an opening for a master M2 internship project at the IPhT, CEA-Saclay for the academic year 2017/18. See below for potential subjects and topics . If you are interested please contact me directly at marco.schiro@ipht.fr

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Stage 1:  Driven-Dissipative Quantum Light Matter Systems

Experimental progress in coupling light and matter at the quantum level achieved with cavity-Quantum Electrodynamics (CQED) has brought forth new platforms for many body quantum optics, where light and matter play equally important roles in collective quantum behavior. Examples include microcavity exciton-polaritons showing non-equilibrium superfluidity, arrays of coupled CQED cavities hosting correlated states of light, such as the driven-dissipative Mott insulator of polaritons. From a theoretical perspective CQED arrays can be described by models of interacting bosons in presence of both external driving fields and dissipation mechanisms, representing unavoidable particle losses, dephasing and decoherence processes and which are naturally described in terms of many-body Lindblad Master Equations for the system density matrix. The crucial aspect of the problem lies in the balance between unitary (drive) and dissipative (losses) evolution, out of which non trivial stationary and transient states are expected to emerge as well as novel classes of dynamical and dissipative quantum phase transitions. The goal of this master project is to investigate models of driven and dissipative quantum light matter systems using a combination of analytical and numerical techniques.

Stage 2: Flow Equation Approaches for Disordered Quantum Systems Out of Equilibrium

Quenched random disorder can have dramatic effects on transport and dynamical properties of quantum many-body systems, leading to a complete breakdown of diffusion and to the localized non-ergodic behavior of a non-interacting quantum particle in a random external potential, as first predicted by Anderson. For long times it was thought that such a localized phase would have not survived in presence of finite interaction and finite excitation energy(temperature); the recent theoretical and experimental discovery of Many Body Localization (MBL) therefore came as a surprise.  MBL is a new quantum phase of matter where thermalization and equilibration break down due to strong disorder, resulting in a number of remarkable non equilibrium properties. We have recently developed a flow-equation approach to describe static and dynamical properties of MBL phases and the goal of this master project is to use and extend further this technique to different settings, including generic time dependent problems, periodically driven systems, dissipative systems.

Stage 3: Periodically Driven Quantum Many Body Systems

Recent years have seen tremendous progress in the control and manipulation of quantum phases of matter with external driving fields. Notable examples include light-induced superconductivity, or the realization of a topological Haldane phase with ultra cold atoms. From a theoretical perspective, investigations on driven quantum systems, so called “Floquet” problems, have a long tradition but until recently they were mostly focused on single-particle problems. The interest toward genuine many body, strongly interacting realizations of these settings has grown in the past few years and several non trivial dynamical phenomena are expected to emerge due to the competition between interaction and drive. The goal of this master project is to investigate models of periodically driven strongly correlated electrons, such as the Fermi Hubbard model, using a combination of analytical and numerical techniques.

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Postdoc opening at IPhT, CEA-Saclay: Driven Dissipative Quantum Systems

Applications are invited to fill a postdoctoral position in the condensed matter/statistical physics group at the Institute for Theoretical Physics (IPhT) of CEA Saclay. The focus will be on driven and dissipative quantum many body systems, broadly intended, including models of light-matter systems out of equilibrium (cavity/circuit QED arrays,..), dissipative quantum spin chains, as well as mesoscopic quantum circuits coupled to electromagnetic resonators.

 The theoretical activity will be carried out at IPhT in collaboration with Marco Schiro’ and Gregoire Misguich, and it will benefit from interactions with other groups in the Paris-Saclay campus actively working on related topics both on the theory and the experimental side. Candidates with research experience in either non-equilibrium many body physics, condensed matter theory, quantum information and quantum optics are especially encouraged to apply. Depending on the project and candidate’s expertise and preferences the work might range from mainly analytical to largely numerical.
Applications including (a) a letter of motivation (b) a description of research interests (c) a CV with list of publications/preprints and (d) three letters of recommendation should be uploaded online, no later than November 30 2016, through AcademicJobsOnline.
For further information and inquiries please contact:
 marco.schiro@cea.fr, Gregoire.Misguich@cea.fr

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Opening for a Master M2 Internship at IPhT, CEA-Saclay

I have an opening for a master M2 internship project at the IPhT, CEA-Saclay for the academic year 2016/17. See below for more information. If you are interested please contact me directly at marco.schiro@cea.fr

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Internship proposal

Title:Breakdown of Thermalization in Disordered Quantum Systems: Many Body Localization and its Consequences
Internship location: IPhT, CEA-Saclay
Funding: CEA

Abstract

The question of whether isolated interacting quantum many body systems can “thermalize”, namely approach thermal equilibrium under their own unitary dynamics, is a venerable one in quantum statistical mechanics. Recent theoretical and experimental investigations triggered a new wave of interest onto this fundamental problem suggesting that quenched random disorder can provide a generic and robust mechanism for thermalization-breakdown, via the phenomenon of Many Body Anderson Localization (MBL). While some intriguing properties of this non-ergodic phase of quantum matter have been explored, specifically concerning entanglement growth, broken symmetry phases or persistent memory of initial conditions, many questions remain wide open.

The goal of this internship is to investigate specifically the dynamical consequences of MBL, by studying models of disordered quantum systems out of equilibrium. Different theoretical tools will be used, depending on the strength and expertise of the candidate, ranging from numerical methods (exact diagonalization and its variants) to analytical approaches on simplified models.

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Upcoming Nonequilibrium Events

I will post here upcoming meetings, conferences, workshop and summer schools in the broad field of non-equilibrium quantum many body physics including events in quantum statistical physics, condensed matter, atomic physics and quantum optics, quantum information,.. Have a look!

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2016 Itzykson Conference on Dynamics and Disorder

Together with Giulio Biroli, Eugene Bogomolny and Cecile Monthus, I am organizing the  21st edition of the Claude Itzykson Conference at the Institut de Physique Théorique (IPhT) of CEA-Saclay. It will take place on June 13-15 and will be devoted to the themes of dynamics, disorder and localization in strongly interacting quantum many body systems. See the conference webpage for further information on the meeting, including a list of invited speakers.

 

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Course on Quantum Many Body Dynamics at IPhT

I will be teaching a short 10h course on Quantum Many Body Dynamics at IPhT-Saclay in Jan-Feb 2016, see here for info about schedule, outline and lecture notes.

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Opening for Master M2 Internship at IPhT, CEA-Saclay (CLOSED)

I have an opening for a master M2 internship project at the IPhT, CEA-Saclay for the Winter/Spring 2016. See below for more information. If you are interested please contact me directly at marco.schiro@cea.fr

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Internship proposal

Title:Quantum Phase Transitions in Open Dissipative Light-Matter Systems
Internship location: IPhT, CEA-Saclay
Funding: CEA

Recent years have seen an enormous increase in the level of control over light-matter interactions at the genuine quantum level with both atomic and solid-state systems. These major experimental achievements have brought forth a novel class of systems where light and matter play equally important roles in emergent quantum many body phenomena. A crucial feature of this kind of systems is their intrinsic non equilibrium nature: indeed unavoidable photon losses, together with the possibility of feeding in additional photons through continuous external driving, make them open quantum many body systems. Under the influence of driving and dissipation they can display interesting steady states undergoing quantum phase transitions with new universal properties.

The goal of this internship project is to study the effect of photon dissipation on a prototype example of light-matter phase transition, the Dicke super-radiance. To this extent we will compute several observables and characterize the phase diagram as a function of light-matter coupling and dissipation. The stage will be theoretical, at the rich interface between non equilibrium statistical physics, quantum condensed matter and quantum optics, and will make use of analytical techniques (large spin approach, Keldysh Field Theory) and/or simple numerical calculations.

See one-slide-presentation, here.

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