L2C
https://www.coulomb.univmontp2.fr/
enSPIP  www.spip.net, AIGLe  aigle.sf.net
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Laboratoire Charles Coulomb UMR 5221 CNRS/UM2 (L2C)http://www.coulomb.univmontp2.fr/plugins/kitcnrs5.3/images/logo_small_l2c.jpg
https://www.coulomb.univmontp2.fr/
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#physique  Seminar of MUSINO Dafne: IMPACT OF SURFACE MODIFICATION ON THE STRUCTURE AND DYNAMICS OF SILICAPOLYMER NANOCOMPOSITES
https://www.coulomb.univmontp2.fr/?page=seminaires&id_seminar=803&details=1
20171120T13:58:44Z20171120T13:58:44Ztext/htmlenMUSINO Dafne#physique  Seminar of GLAZOV Mikhail: Nonlinear optics and transport of excitons in transition metal dichalcogenides monolayers
https://www.coulomb.univmontp2.fr/?page=seminaires&id_seminar=798&details=1
20171107T09:15:10Z20171107T09:15:10Ztext/htmlenGLAZOV MikhailMonolayers of transition metal dichalcogenides (TMDs) with MoS2 and WSe2 being the prominent examples are actively studied nowadays. These materials demonstrate remarkable optical properties controlled by the robust excitons, Coulombcorrelated electronhole pairs, with the binding energies on the order of several hundreds millielectronvolts. In semiconductors, WannierMott excitons form a series of 1s, 2s, 2p, … hydrogenlike states. In TMD monolayers the binding energies of the excitonic states strongly differ from the twodimensional hydrogen atom model. In my talk, the nonlinear optical and transport effects of excitons in TMD monolayers are discussed.#physique  Seminar of HAGENMÜLLER David: Changing properties of condensedmatter systems in cavityQED
https://www.coulomb.univmontp2.fr/?page=seminaires&id_seminar=802&details=1
20171120T10:04:42Z20171120T10:04:42Ztext/htmlenHAGENMÜLLER DavidThe enhancement of lightmatter interactions when the macroscopic number of quantum emitters in a semiconductor interact resonantly with a cavity mode has led to the observation of spectacular phenomena such as BoseEinstein condensation at standard cryogenic temperature [1], polariton lasing [2], or light superfluidity [3]. In particular, the properties of the ground state are qualitatively affected in the socalled “ultrastrong” lightmatter coupling regime, defined when the collective coupling strength becomes comparable to the bare cavity mode frequency [4]. I will first show that this regime can be achieved in quantum Hall systems with large filling factors [5,6,7], and explain how an interesting ultrastrong coupling regime with low loss can be realized by considering the twodimensional electron gas embedded in a terahertz photonic band gap material. I will give an example of how this system could be used to observe the dynamical Casimir effect in realistic experimental conditions8. An other interest of quantum Hall systems is the existence of strong correlations due to the quenching of the kinetic energy, leading to exotic electronic phases in the fractional filling factor regime. I will draw some perspectives on how an interesting interplay between Coulomb and lightmatter interactions could be achieved by designing a suitable resonator made of hyperbolic metamaterials. Following the idea of exploring how lightmatter coupling in a cavity can modify fermionic properties of condensed matter systems, I will then move to a simple twoband model to study the coherent transport of charges coupled to a cavity mode. In particular, charge current enhancements are predicted in the situation where lower and upper bandwidths are different9. I will conclude by showing how this simple model could be extended to describe incoherent transport in organic semiconductors, drawing a roadmap to enhance the efficiency of light emitting and collecting devices using cavity coupling. 1. Amo, A. et al., Nature Physics 5, 805 (2009) 2. Christopoulos, S. et al., Phys. Rev. Lett. 98, 126405 (2007) 3. Kasprzak, J. et al., Nature 443, 409 (2006) 4. Ciuti, C., Bastard, G. & Carusotto, I., Phys. Rev. B 72, 115303 (2005). 5. Hagenmüller, D., De Liberato, S. & Ciuti, C. Phys. Rev. B 81, 235303 (2010) 6. Scalari, G. et al. Science 335, 1323–1326 (2012) 7. Hagenmüller, D. & Ciuti, C. Phys. Rev. Lett. 109, 267403 (2012). 8. Hagenmüller, D. Phys. Rev. B 93, 235309 (2016) 9. Hagenmüller, D., Schachenmayer, J., Schütz, S., Genes, C. & Pupillo, G. (2017). ArXiv: 1703.00803v2 [quantph]. Accepted for publication in Phys. Rev. Lett.(ART) Absence of Marginal Stability in a Structural Glass
https://www.coulomb.univmontp2.fr/?page=publications&ref_preprint=L2C:17151&details=1
20171116T23:00:00Z20171116T23:00:00Ztext/htmlenMarginally stable solids have peculiar physical properties that were discovered and analyzed in the context of the jamming transition. We theoretically investigate the existence of marginal stability in a prototypical model for structural glassformers, combining analytical calculations in infinite dimensions to computer simulations in three dimensions. While meanfield theory predicts the existence of a Gardner phase transition towards a marginally stable glass phase at low temperatures, simulations show no hint of diverging timescales or lengthscales, but reveal instead the presence of sparse localized defects. Our results suggest that the Gardner transition is deeply affected by finite dimensional fluctuations, and raise issues about the relevance of marginal stability in structural glasses far away from jamming.(ART) Brittle fracture of polymer transient networks
https://www.coulomb.univmontp2.fr/?page=publications&ref_preprint=L2C:17152&details=1
20171031T23:00:00Z20171031T23:00:00Ztext/htmlenWe study the fracture of reversible double transient networks, constituted of water suspensions of entangled surfactant wormlike micelles reversibly linked by various amounts of telechelic polymers. We provide a state diagram that delineates the regime of fracture without necking of the filament from the regime where no fracture or breakup has been observed. We show that filaments fracture when stretched at a rate larger than the inverse of the slowest relaxation time of the networks. We quantitatively demonstrate that dissipation processes are not relevant in our experimental conditions and that, depending on the density of nodes in the networks, fracture occurs in the linear viscoelastic regime or in a nonlinear regime. In addition, analysis of the crack opening profiles indicates deviations from a parabolic shape close to the crack tip for weakly connected networks. We demonstrate a direct correlation between the amplitude of the deviation from the parabolic shape and the amount of non linear viscoelasticity.(ART) Giant Interatomic EnergyTransport Amplification with Nonreciprocal Photonic Topological Insulators
https://www.coulomb.univmontp2.fr/?page=publications&ref_preprint=L2C:17127&details=1
20171025T22:00:00Z20171025T22:00:00Ztext/htmlenWe show that the energytransport efficiency in a chain of twolevel emitters can be drastically enhanced by the presence of a photonic topological insulator (PTI). This is obtained by exploiting the peculiar properties of its nonreciprocal surface plasmon polariton (SPP), which is unidirectional, and immune to backscattering, and propagates in the bulk band gap. This amplification of transport efficiency can be as much as 2 orders of magnitude with respect to reciprocal SPPs. Moreover, we demonstrate that despite the presence of considerable imperfections at the interface of the PTI, the efficiency of the SPPassisted energy transport is almost unaffected by discontinuities. We also show that the SPP properties allow energy transport over considerably much larger distances than in the reciprocal case, and we point out aparticularly simple way to tune the transport. Finally, we analyze the specific case of a twoemitter chain and unveil the origin of the efficiency amplification. The efficiency amplification and the practical advantages highlighted in this work might be particularly useful in the development of new devices intended to manage energy at the atomic scale.GaAs/GaInAs/GaAlAs Hall sensors
https://www.coulomb.univmontp2.fr/GaAsGaInAsGaAlAsHallsensors
https://www.coulomb.univmontp2.fr/GaAsGaInAsGaAlAsHallsensors20101011T16:53:26Ztext/htmlenDavid CASSAGNE
<p>Hall sensors, based on GaAs/GaInAs/GaAlAs pseudomorphic heterostructures, can be used for metrological and microscopic applications like electricity metering or scanning magnetometer. <br class='autobr' />
Electricity metering. The thermal drift cancellation of the magnetic sensitivity of Hall sensors used for electricity metering was the purpose of an industrial contract with ITRONFrance and the main purpose of the E.R.T. project (Equipe de Recherche Technologique / ERT4 MatériauxµCapteursµSystèmes; (...)</p>

<a href="https://www.coulomb.univmontp2.fr/ThemeComposantsetCapteurs" rel="directory">Theme: Devices and Sensors</a>
Congress/Workshop from 20171206 to 20171208: Strong Dynamics at the Electroweak Scale
https://www.coulomb.univmontp2.fr/Strongdynamicsattheelectroweakscale]
19700101T00:00:00Z19700101T00:00:00ZenCongress/Workshop from 20171215 to 20171215: Cosmology & High Energy Physics III
https://www.coulomb.univmontp2.fr/CosmologyHighEnergyPhysicsIII]
19700101T00:00:00Z19700101T00:00:00ZenCongress/Workshop from 20180115 to 20180117: Polymères et Océans 2018
https://po2018.wixsite.com/po2018]
19700101T00:00:00Z19700101T00:00:00Zen