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Accueil du site > Annuaire > Lemarié Gabriel

Lemarié Gabriel

Researcher (CR1) - CNRS

Contact : Gabriel.LemarieATirsamc.ups-tlse.fr

Address : Laboratoire de Physique Theorique, IRSAMC, Universite Paul Sabatier, 118 Route de Narbonne, 31062 Toulouse Cedex 4, France

Office : 312 Batiment 3R1B4

Phone : +33 (0)5 61 55 64 63

Fax : +33 (0)5 61 55 60 65

RESEARCH ACTIVITIES : quantum disordered or chaotic systems

- Quantum transport with cold atoms
- Anderson localization
- Quantum chaos
- Disordered superconductors/Superfluid-insulator transition

PUBLICATIONS

See the full list.
You can also have a look at Google Scholar.

RECENT HIGHLIGHTS



Controlling symmetry and localization with an artificial gauge field in a disordered quantum system
C. Hainaut, I. Manai, J.-F. Clément, J.C. Garreau, P. Szriftgiser, G. Lemarié, N. Cherroret, D. Delande, R. Chicireanu
Artificial Gauge Field for cold atoms using a simple temporal modulation + First experimental observation of CFS & beta(g)
arXiv:1709.02632




Weak Versus Strong Disorder Superfluid-Bose Glass Transition in One Dimension
E.V.H. Doggen, G. Lemarié, S. Capponi, N. Laflorencie
arXiv:1704.02257




Chaos-assisted tunneling in the presence of Anderson localization
E.V.H. Doggen, B. Georgeot, G. Lemarié
arXiv:1610.00587




Scaling theory of the Anderson transition in random graphs : ergodicity and universality
I. García-Mata, O. Giraud, B. Georgeot, J. Martin, R. Dubertrand, and G. Lemarié
Phys. Rev. Lett. 118, 166801 (2017)




Kaleidoscope from the article :
Routes towards the experimental observation of the large fluctuations due to chaos-assisted tunneling effects with cold atoms
R. Dubertrand, J. Billy, D. Guéry-Odelin, B. Georgeot, and G. Lemarié
Phys. Rev. A 94, 043621 (2016)








RESEARCH COMPLETED

My main contributions all fall in the field of mesoscopic physics, but they can be divided into four themes.

The first, which is the most important part of my scientific work, deals with the quantum transport of atomic matter waves in disordered or chaotic systems. My most striking result in this area is for having allowed the first experimental observation of the metal-insulator Anderson transition with atomic matter waves. I also looked at the critical state of this transition, and found a scale invariance and an analytical form that are in very good agreement with experimental and numerical data. I finally described theoretically the phase diagram of the anisotropic Anderson transition, for the first time measured experimentally. See the two articles to the general public in Physics and Images de la Physique 2009.

The second theme is that of fluctuations of quantum transport. In the presence of chaos or disorder, fluctuations contain a crucial part of the physics. A well-known example is multifractality which appears at the Anderson transition or in pseudo-integrable systems, and corresponds to fluctuations described by multiple fractal dimensions. I have shown that the imperfections inevitably present in experimental realizations destroy multifractality following two universal scenarios. On the other hand, I am studying chaos-assisted tunneling with cold atoms whose fluctuations are similar to the universal conductance fluctuations.

The third theme concerns the study of the effects of interactions in quantum disordered systems. I have studied the inhomogeneous nature of strongly disordered superconductors. I have shown that the distribution of the local order parameter follows a universal scaling law remarkably verified by experimental data of scanning tunneling microscopy. I have recently studied with exact numerical simulations the critical behavior near the superfluid-insulator transition, with a delicate estimate of the critical exponents. I have shown that the probability distribution of the superfluid response was not self-averaging in the Bose glass phase, thus indicating a strong inhomogeneity.

The fourth issue is that of quantum transport through nanostructures in 2D electron gas. I have studied the quantum interference present when the transport is imaged by scanning gate microscopy. I have discovered a counterintuitive thermal enhancement of interference effects in quantum point contacts.

COLLABORATIONS

- Cold atom group of J.C. Garreau and P. Szriftgiser at PhLAM Laboratory in Lille.
- Cold atom group of D. Guéry-Odelin and J. Billy at LCAR in Toulouse.
- D. Delande (LKB, Paris), C. Castellani (La Sapienza, Rome), I. Garcia­ Mata (Mar del Plata, Argentina), B. Georgeot (LPT, Toulouse), O. Giraud (LPTMS, Orsay), N. Laflorencie (LPT, Toulouse), J. Martin (University of Liège).