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{ "count": 253, "next": null, "previous": "https://memento.epfl.ch/api/v1/events/?format=api&limit=10&offset=240&ordering=event__label_link", "results": [ { "id": 72571, "title": "IMX Colloquium - Designer Quantum Materials from Carbon", "slug": "imx-colloquium-designer-quantum-materials-from-c-2", "event_url": "https://memento.epfl.ch/event/imx-colloquium-designer-quantum-materials-from-c-2", "visual_url": "https://memento.epfl.ch/image/33820/200x112.jpg", "visual_large_url": "https://memento.epfl.ch/image/33820/720x405.jpg", "visual_maxsize_url": "https://memento.epfl.ch/image/33820/max-size.jpg", "lang": "en", "start_date": "2026-11-09", "end_date": "2026-11-09", "start_time": "13:15:00", "end_time": "14:15:00", "description": "<p>Atomically precise carbon nanostructures offer a new route to quantum systems built from the bottom up. By combining molecular design, on-surface synthesis and scanning probe microscopy, we can control atomic structure, electronic states and magnetic interactions within the same platform.<br>\r\nIn this talk, I will follow the path from bottom-up synthesized graphene nanoribbons [1,2] to open-shell nanographenes [3] and designer quantum spin systems [4]. I will discuss how atomic structure can determine electronic topology and how molecular spins can be coupled into well-defined quantum chains. Recent examples include Haldane chains [4], alternating-exchange spin chains [5] and antiferromagnetic Heisenberg chains [6], where collective and fractional excitations can be probed directly at the atomic scale.<br>\r\nMore broadly, this work illustrates a materials-science strategy in which structure, functionality and interactions are programmed at the level of molecular building blocks. Rather than optimizing properties in an existing material, the aim is to design the material and its quantum behavior together. Atomically precise carbon nanostructures therefore provide a model platform for exploring how synthesis, structure and emergent functionality can be linked in a predictive way, with implications for the future design of low-dimensional electronic, magnetic and quantum materials.\r\n</p><ol>\r\n\t<li>J. Cai, P. Ruffieux, R. Jaafar, <em>et al.</em>, <em>Nature</em> <strong>466</strong>, 470–473 (2010).</li>\r\n\t<li>F. Xiang, Y. Gu, A. Kinikar, <em>et al.</em>, <em>Nat. Chem</em>. <strong>17</strong>, 1356–1363 (2025).</li>\r\n\t<li>S. Mishra, D. Beyer, K. Eimre, <em>et al</em>., <em>Nat. </em><em>Nanotechnol</em>. <strong>15</strong>, 22–28 (2020).</li>\r\n\t<li>S. Mishra, G. Catarina, F. Wu, <em>et al</em>., <em>Nature</em> <strong>598</strong>, 287–292 (2021).</li>\r\n\t<li>C. Zhao, G. Catarina, J.-J. Zhang, <em>et al</em>., <em>Nat. </em><em>Nanotechnol</em>. <strong>19</strong>, 1789-1795<strong> </strong>(2024).</li>\r\n\t<li>C. Zhao, L. Yang, J. C. G. Henriques, <em>et al</em>., <em>Nat. Mater.</em> <strong>24,</strong> 722–727 (2025).</li>\r\n</ol>\r\nBio: Roman Fasel is a leading scientist in the field of atomically precise carbon nanostructures and surface-based quantum materials. He received his Ph.D. in Physics from the University of Fribourg in 1996 and then carried out postdoctoral research at La Trobe University in Melbourne and the Fritz Haber Institute in Berlin before joining Empa. Today, he heads Empa’s nanotech@surfaces Laboratory and is Adjunct Professor at the University of Bern. He pioneered the bottom-up synthesis of graphene nanoribbons, establishing on-surface synthesis as a major new direction in nanoscience, and has since extended this work to topological states, open-shell nanographenes and quantum spin chains.", "image_description": "", "creation_date": "2026-09-14T10:43:28", "last_modification_date": "2026-09-14T10:43:41", "link_label": "Website", "link_url": "https://www.empa.ch/web/s205/roman-fasel", "canceled": "False", "cancel_reason": "", "place_and_room": "MXF 1", "url_place_and_room": "https://plan.epfl.ch/?room==MXF%201", "url_online_room": "", "spoken_languages": [ "https://memento.epfl.ch/api/v1/spoken_languages/2/?format=api" ], "speaker": "Prof. Roman Fasel, EMPA, Zürich", "organizer": "Prof. Gregor Jotzu, Prof. Esther Amstad & Prof. Fabien Sorin", "contact": "Prof. Gregor Jotzu, Prof. Esther Amstad & Prof. Fabien Sorin", "is_internal": "False", "theme": "", "vulgarization": { "id": 1, "fr_label": "Tout public", "en_label": "General public" }, "registration": { "id": 3, "fr_label": "Entrée libre", "en_label": "Free" }, "keywords": "", "file": null, "icalendar_url": "https://memento.epfl.ch/event/export/121785/", "category": { "id": 1, "code": "CONF", "fr_label": "Conférences - Séminaires", "en_label": "Conferences - Seminars", "activated": true }, "academic_calendar_category": null, "domains": [], "mementos": [ "https://memento.epfl.ch/api/v1/mementos/8/?format=api", "https://memento.epfl.ch/api/v1/mementos/314/?format=api" ] }, { "id": 72764, "title": "IMX Talks - Resolving Hierarchical Structure with X-ray scattering imaging", "slug": "imx-talks-resolving-hierarchical-structure-with-x", "event_url": "https://memento.epfl.ch/event/imx-talks-resolving-hierarchical-structure-with-x", "visual_url": "https://memento.epfl.ch/image/33978/200x112.jpg", "visual_large_url": "https://memento.epfl.ch/image/33978/720x405.jpg", "visual_maxsize_url": "https://memento.epfl.ch/image/33978/max-size.jpg", "lang": "en", "start_date": "2026-11-02", "end_date": "2026-11-02", "start_time": "16:30:00", "end_time": "17:30:00", "description": "<p>The function of many materials, from biological tissues to industrial polymers, depends on how their nanoscale building blocks are arranged and aligned within a macroscopic structure, which is essential to understand but difficult to resolve: established high-resolution techniques typically access only small sample volumes, limiting the ability to capture structural or biological variability across extended, heterogeneous samples.<br>\r\nSmall-angle X-ray scattering (SAXS) imaging probes local nanostructure by raster-scanning a focused synchrotron beam across a sample. This can be extended to resolve nanostructure orientation voxel-by-voxel in three dimensions in a method called SAXS tensor tomography, which we implement in our open-source software package Mumott. In this presentation, I will show how this approach, and its continued development, can be applied across different material systems.<br>\r\nFor injection-molded polymer packaging, SAXS imaging has resolved the layered anisotropic nanostructure important for its mechanical properties, and, combined with industrial processing simulations, the structure formation during thermal processing. Another example is bone, where resolving structure requires both three-dimensional information and sufficient sampling to capture biological variability. Combining 2D and 3D SAXS imaging, we studied regional differences in the human femoral neck, an anatomical site relevant to hip fractures, and, at higher resolution, resolved alternating chirality between neighboring lamellae within individual osteons, a structural feature proposed on mechanical grounds over a century ago.<br>\r\nThese examples illustrate how tensor tomography, extended beyond X-ray scattering to wide-angle diffraction and visible-light polarimetry, provides a route to resolving hierarchical structure across a wide range of material systems.<br>\r\n<br>\r\nBio:<strong> </strong>Marianne Liebi studied food science at ETH Zurich, where she also completed her PhD in 2013, followed by postdoctoral research at the Paul Scherrer Institute and MAX IV Laboratory, Lund. In 2017, she started her own research group at Chalmers University of Technology, Gothenburg, and was appointed in 2021 as tenure-track Assistant Professor at EPFL, where she heads the Laboratory for X-ray Characterization of Materials (cam-X) within the Institute of Materials, in a joint position with the Paul Scherrer Institute (PSI). Her research develops advanced X-ray and optical imaging techniques, centered on small-angle X-ray scattering (SAXS) in 2D and 3D, to resolve the hierarchical structure of materials ranging from fiber composites to pharmaceutical formulations and bone.</p>", "image_description": "", "creation_date": "2026-10-05T09:26:03", "last_modification_date": "2026-10-05T10:29:57", "link_label": "Website", "link_url": "https://www.psi.ch/de/lsc/people/marianne-liebi", "canceled": "False", "cancel_reason": "", "place_and_room": "BM 5202", "url_place_and_room": "https://plan.epfl.ch/?room==BM%205202", "url_online_room": "https://epfl.zoom.us/j/63884474245", "spoken_languages": [ "https://memento.epfl.ch/api/v1/spoken_languages/2/?format=api" ], "speaker": "Prof. Marianne Liebi, EPFL STI IMX CAM-X", "organizer": "Prof. Michele Ceriotti", "contact": "Prof. Michele Ceriotti", "is_internal": "False", "theme": "", "vulgarization": { "id": 1, "fr_label": "Tout public", "en_label": "General public" }, "registration": { "id": 3, "fr_label": "Entrée libre", "en_label": "Free" }, "keywords": "", "file": null, "icalendar_url": "https://memento.epfl.ch/event/export/122060/", "category": { "id": 1, "code": "CONF", "fr_label": "Conférences - Séminaires", "en_label": "Conferences - Seminars", "activated": true }, "academic_calendar_category": null, "domains": [], "mementos": [ "https://memento.epfl.ch/api/v1/mementos/8/?format=api", "https://memento.epfl.ch/api/v1/mementos/314/?format=api" ] }, { "id": 72760, "title": "AI Center Seminar - AI Fundamentals series - Ricardo Olmedo - \"Speedrunning SWE-bench, or the $1,000 coding agent\"", "slug": "ai-center-seminar-ai-fundamentals-series-ricardo-2", "event_url": "https://memento.epfl.ch/event/ai-center-seminar-ai-fundamentals-series-ricardo-2", "visual_url": "https://memento.epfl.ch/image/33976/200x112.jpg", "visual_large_url": "https://memento.epfl.ch/image/33976/720x405.jpg", "visual_maxsize_url": "https://memento.epfl.ch/image/33976/max-size.jpg", "lang": "en", "start_date": "2026-10-07", "end_date": "2026-10-07", "start_time": "15:00:00", "end_time": "16:00:00", "description": "<p>The talk is jointly organized by the <a href=\"https://ai.epfl.ch/\">EPFL AI Center</a> and the <a href=\"https://www.epfl.ch/labs/mlo/\">MLO</a> Lab as part of the AI fundamentals seminar series.<br>\r\n<br>\r\n<strong><em>Hosting Professor: Prof. Martin Jaggi</em></strong><br>\r\n<br>\r\n<strong>Title</strong><br>\r\nSpeedrunning SWE-bench, or the $1,000 coding agent<br>\r\n<br>\r\n<strong>Abstract</strong><br>\r\nSpeedrunning has become a popular engineering challenge in machine learning: achieve the best performance within a fixed compute budget. We use it as a scientific tool to study how models acquire specialized skills and how far those skills transfer. We speedrun SWE-bench by training coding agents from scratch on demonstrations from stronger models. With about $1,000 of training compute, we reach a 25% solve rate, outperforming GPT-4o. Compared to models with extensive pre-training, our speedrun models solve largely the same SWE-bench problems, and generalize about as well to new bugs and codebases. What, then, does pre-training buy for SWE-bench? Our experiments suggest a one-student hypothesis: pre-training helps a student imitate its teacher, but at matched imitation loss, pre-training choices barely matter. We stress-test this hypothesis by comparing a model trained on the web against a “vintage\" one trained only pre-1931 documents. Up to the SWE-bench scores we reach, pre-training is interchangeable with specialization data. We release nanoswe as an open project for studying specialization through speedrunning.<br>\r\n<br>\r\n<strong>Bio</strong><br>\r\nRicardo Olmedo is a final-year PhD student at the Max Planck Institute for Intelligent Systems in Tübingen and a Google PhD Fellow. Advised by Moritz Hardt and Bernhard Schölkopf, he works on language model benchmarking and specialization. His research has earned three oral presentations at ICLR and NeurIPS. Most recently, he spent spring and summer 2026 visiting Sanmi Koyejo at Stanford University.</p>", "image_description": "", "creation_date": "2026-10-04T16:12:34", "last_modification_date": "2026-10-04T16:19:40", "link_label": "Zoom Link", "link_url": "https://epfl.zoom.us/j/62586405912?pwd=OffU3pokqFjxl6rj6cmbrdlLEg6LKc.1", "canceled": "False", "cancel_reason": "", "place_and_room": "ELE 117", "url_place_and_room": "https://plan.epfl.ch/?room==ELE%20117", "url_online_room": "https://epfl.zoom.us/j/62586405912?pwd=OffU3pokqFjxl6rj6cmbrdlLEg6LKc.1", "spoken_languages": [ "https://memento.epfl.ch/api/v1/spoken_languages/2/?format=api" ], "speaker": "Ricardo Olmedo", "organizer": "<a href=\"https://ai.epfl.ch/\">EPFL AI Center</a> and the <a href=\"https://www.epfl.ch/labs/mlo/\">MLO</a> Lab", "contact": "Nicolas Machado", "is_internal": "False", "theme": "", "vulgarization": { "id": 1, "fr_label": "Tout public", "en_label": "General public" }, "registration": { "id": 3, "fr_label": "Entrée libre", "en_label": "Free" }, "keywords": "", "file": null, "icalendar_url": "https://memento.epfl.ch/event/export/122056/", "category": { "id": 1, "code": "CONF", "fr_label": "Conférences - Séminaires", "en_label": "Conferences - Seminars", "activated": true }, "academic_calendar_category": null, "domains": [], "mementos": [ "https://memento.epfl.ch/api/v1/mementos/1/?format=api", "https://memento.epfl.ch/api/v1/mementos/6/?format=api", "https://memento.epfl.ch/api/v1/mementos/8/?format=api", "https://memento.epfl.ch/api/v1/mementos/416/?format=api" ] } ] }
