Accueil > Séminaires
(6) Colloquium - Année 2022
Jeu. 07/04/2022 09:45 sc 36.07 SALEZ Thomas (CNRS, Université de Bordeaux, Hokkaido University) Lift at low Reynolds (Matière Molle & Verres) Soft and wet contact arises in a range of phenomena that spans many length and time scales, and includes : landslides, aquaplaning of tires, wear of industrial bearings, ageing of synovial and cartilaginous joints, cell motion in blood vessels or microfluidic devices, and atomic-force or surface-force rheology. Therein, the coupling between boundary elasticity and confined viscous flow leads to a striking zoology of counterintuitive emergent effects. From the canonical situation of a free particle that can simultaneously sediment, slide, and roll in a viscous fluid, and near a soft wall, we study a range of novel inertial-like (despite the low-Reynolds-number flow) features, such as : enhanced sedimentation, elastohydrodynamic bouncing, roll reversal, emergent lift and torque... Pour plus d'informations, merci de contacter Finco A. |
Jeu. 14/04/2022 09:45 SC 36.04 AHARONOVICH Igor (UTS-Sydney, Australia) Quantum Nanophotonics Hexagonal Boron Nitride Engineering robust solid-state quantum systems is amongst the most pressing challenges to realize scalable quantum photonic circuitry. While several 3D systems (such as diamond or silicon carbide) have been thoroughly studied, solid state emitters in two dimensional (2D) materials are still in their infancy. Pour plus d'informations, merci de contacter Cassabois G. |
Jeu. 19/05/2022 09:45 sc 36.04 BLOCH Jacqueline (Centre de Nanosciences et de Nanotechnologies - C2N) Using cavity polariton lattices as analog simulators (Physique de l'exciton, du photon et du spin) An analog simulator is a synthetic physical system, which emulates in a controlled way a physical problem. You can get answers about the physical problem by directly performing experiments on the simulator. In the present seminar, I will present the polariton platform and explain how it is relevant for analog simulation of many interesting complex problems. Pour plus d'informations, merci de contacter Finco A. |
Ven. 10/06/2022 11:30 Polytech RdC salle SC001 TUNNELL James W. (Department of Biomedical Engineering, The University of Texas at Austin) Nanophotonics in cancer monitoring and immunotherapy (Nanostructures & Spectroscopie) Nanophotonics refers to the unique interactions of light (photonics) and materials at the nanometer scale. Nanometer sized metals (e.g. gold, silver, copper) exhibit extremely high electric field enhancements when excited by laser light, leading to unique opportunities in sensing and therapy in cancer applications. Therapeutically, this interaction can be used to generate heat and mechanical shock waves (nanobubbles) that serve to release drugs, denature proteins, or disrupt cell membranes. We’ve demonstrated these effects can illicit a specific type of cell death that stimulates the body’s immune system to fight cancer in models of breast cancer and melanoma. Diagnostically, these nanomaterials enable a sensing platform using surface enhanced Raman scattering (SERS) that greatly enhances the detection ability of molecules near the particle surface. We are developing implantable devices with SERS sensors to monitor patients at risk for cancer recurrence after treatments. Pour plus d'informations, merci de contacter Finco A. |
Mer. 16/11/2022 09:45 Bâtiment 20 LE GALL Claire (Cavendish Laboratory, University of Cambridge) Present address: Microsoft research, Cambridge Quantum networks with quantum dot spin qubits (Physique de l'exciton, du photon et du spin) Quantum is booming, and established quantum platforms (superconducting circuits, trapped ions, Ry atom arrays and photons) are now moving to the realm of industry (IBM, IONQ, PasQal, and PsiQuantum). A key enabler to some of these approaches is a pristine spin-photon interface that allows entangling long-lived matter-based qubits with routable flying qubits in the form of photons. This talk will introduce you to the key concepts and challenges behind quantum computing and contextualize the sustained research efforts to develop the performance of candidate systems such as trapped ions, atomic impurities in solids and quantum dot spins. The talk will then focus on a specific platform: Optically active semiconductor quantum dots (QDs)--which have unparalleled photonic properties, but also modest spin coherence limited by their resident nuclei--and our most recent work on this platform [1]. In a nutshell, we demonstrated that a new generation of lattice-matched QD devices, with vanishing strain, allows dramatic prolongation of the electron spin coherence over conventional QD counterparts. The near two orders of magnitude improvement of electron spin coherence under dynamical decoupling, also attests of a coherence improvement of the electron-nuclear interface as a whole. We envisage this to enable the storage of quantum information in the nuclear spins, a vital resource towards memory-assisted quantum network protocol. Pour plus d'informations, merci de contacter Finco A. |
Mer. 07/12/2022 09:45 Bâtiment 20, Amphi ROYALL C. Patrick (ESPCI) The Different Facets of Dynamical Arrest in Hard and Sticky Spheres: from Glasses to Gels (Matière Molle & Verres) Our understanding of the mechanism by which the viscosity of supercooled liquids increases by many orders of magnitude is often described as a major challenge in condensed matter physics [1,2]. It is therefore necessary to discriminate between seemingly incompatible theoretical approaches which provide equally good descriptions of experimental data: a scientific revolution [3]. Much of the perceived incompatibility revolves around whether the glass transition is driven by underlying thermodynamics or is predominantly a dynamical phenomenon. Here we report new results with experiments and simulations which explore previously inaccessible dynamical regimes at the single-particle level [4,5], where we test explicitly the predictions of each approach. We find that the predictions of both thermodynamic and dynamical approaches are upheld and suggest routes out of the scientific revolution of the glass transition. Pour plus d'informations, merci de contacter Finco A. |