{
    "153488-21915914":
    {
        "datetime_modified":"20261008T142440",
        "datetime_start":"20261118T130000",
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        "date_start":"2026-11-18",
        "date_end":"2026-11-18",
        "time_start":"13:00:00",
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        "time_zone":"America\/Detroit",
        "event_title":"Interdisciplinary QC-CM Seminar | Topological defects in quantum materials: what the spectrum, the S-matrix and the STM tip know",
        "occurrence_title":"",
        "combined_title":"Interdisciplinary QC-CM Seminar | Topological defects in quantum materials: what the spectrum, the S-matrix and the STM tip know: Eric Akkermans (Technion)",
        "event_subtitle":"Eric Akkermans (Technion)",
        "event_type":"Workshop \/ Seminar",
        "event_type_id":"21",
        "description":"Point defects in chiral or particle\u2013hole-symmetric crystals are topological objects: a vacancy in graphene binds a zero mode fixed by an index theorem, carrying a quantized, measurable charge. I will show how this topology is encoded in three places an experiment can reach:  the displaced-state count, the scattering matrix, and the local density of states, and how an exact closed formula for the defect's scattering determinant yields a sum rule that distinguishes a true vacancy from a strong impurity. The same index structure governs interacting electrons bound to several defects, where the Coulomb interaction entangles the protected modes, and extends, unexpectedly, to the topological classification of two-qubit gates.",
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                "guid":"153488-21915914@events.umich.edu",
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        "building_name":"West Hall",
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        "room":"340",
        "location_name":"West Hall",
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        "tags":["Physics","Science"],
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                "group_name":"Interdisciplinary QC\/CM Seminars",
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