Seminars

Room: Seminar Room 2.06

Magnetism from First-principles

Development and engineering of new magnetic materials is one of the main goals in modern condensed matter physics. Thereby, first-principles simulations play a significant role in the design of new materials. Nowadays first-principles methods based on the density functional theory can provide very accurate information about electronic and magnetic properties of realistic systems and has become a major supplement and alternative to the experiment. [more]

Polarons Imaged in Real Space by Combined AFM/STM

Polarons [1] are quasiparticles that form in ionic lattices due to the interaction of excess charges with lattice distortions. This leads to a spatial confinement of the charge and appearance of many novel phenomena. In past decades, polarons turned out to play an important role in electrical transport, optical properties, organic electronics, catalysis, or in exotic materials properties such as colossal magnetoresistance or high-Tc superconductivity. [more]

Collective States in Self-assembled Nanomaterials for New Functionalities in Vibrational Spectroscopy and Light-matter Coupling

Collective states are key to understand properties of materials across different length scales. In my talk, I will give an overview of different functionalities that emerge from collective states, with prospects for vibrational spectroscopy and engineering material properties with light. [more]

Picosecond Interfacial Dynamics in Crowded Lipid Membranes Probed with Ultrafast 2D Infrared Spectroscopy

Lipid membranes are much more than barriers between cell compartments, they are integral components of the cell involved in key functions such as signaling, transport, and sensing. Membranes are composed of hundreds of different lipid species and contain thousands of proteins. The biophysical implications of membrane heterogeneity are not fully understood. Our group uses 2D IR spectroscopy to probe the local hydrogen-bond dynamics at the lipid-water interface. [more]

Probing Electronic Structure and Magnetism in Low Dimensionality - An Experimental Approach

The ever-growing need for next-generation electronic and magnetic devices calls for new solutions for the engineering of quantum materials, in terms of miniaturization, energy consumption and speed compared to reference benchmarks, e.g. 18 ps for the Larmor magnetization switching. A new paradigm has emerged: the effect of the decrease of dimensionality in magnetic materials is recently being given a large deal of attention. [more]

Investigating Ultrafast Electron and Phonon Dynamics at the Atomic Scale

Electrons, phonons, and their mutual interactions are crucial for the complex phenomena in strongly correlated materials. In this talk, I will show that electron and phonon dynamics can be investigated at the atomic scale by combining THz pump-probe spectroscopy and a scanning tunneling microscope (STM) [1,2]. [more]

Ultrafast Electron Dynamics in Quasi-two-dimensional Quantum Materials

Quantum materials are solids with tantalizing properties arising from special symmetry, dimensionality, topology, and many-body interactions between elementary degrees of freedom (charge, spin, orbital, and lattice). Gaining a microscopic understanding of quantum materials is critical as it implies the possibility of designing materials with desirable properties. [more]

Lightwave-Driven Scanning Tunneling Spectroscopy for Ultrafast Surface Science on the Atomic Scale

The development of novel nanoscale systems with technologically relevant properties has created a demand for powerful experimental technique’s capable of extreme spatio-temporal resolution. Scanning tunneling microscopy (STM) has become an era-defining surface characterization tool capable of extracting the local density of states (LDOS) with ångström-scale spatial resolution. [more]

Understanding of Energy Transfer Dynamics in Luminescent Eu(III) Complex Doped Host-Guest Film

Trivalent europium (Eu(III)) complexes are expected to be used as light-emitting materials such as organic light emitting diodes (OLEDs) because of their high color purity. The complexes are sensitized by the antenna effect, utilizing energy transfer from antenna ligands to a metal center. In the emitting layer of OLEDs, guest emitters are doped in host molecules, and intermolecular energy transfer also occurs. [more]

Water Flows in Carbon Nanochannels, from Carbon Memories to Quantum Friction

The emerging field of nanofluidics explores the molecular mechanics of fluids. This world of infinitesimal fluidics is the frontier where the continuum of fluid dynamics meets the atomic nature of matter, or even its quantum nature. Nature fully exploits the fluidic oddities at the nanoscale and it is capable of breath-taking technological feats using a fluidic circuitry made of multiple biological channels, such as ionic pumps, proton engines, ultra-selective pores, stimulable channels, ... [more]

Ultrafast Science and Technologies at ALLS

The Advanced Laser Light Source (ALLS) is located at INRS-ÉMT near Montreal. It is the national laser facility of Canada offering access to a variety of laser systems and secondary sources. [more]
Single-molecule chemistry [1] has progressed together with the development of scanning probe microscopy and its related methods. Scanning tunneling microscopy (STM) has been widelyused for the observation and control of configurational changes and reactions for individual molecules on surfaces. [more]

Nanomaterials with their specific properties for applications in biomedicine and electronics

The content of my lecture are the results of my research carried out in recent years and educational activities on the preservation of molecular matter condensed in nano-systems and their practical applications using their specific properties in biomedicine and electronics. [more]
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